Organic polymer composite biological polysaccharide conductive hydrogel as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of organic polymer composite materials and flexible electronics, and relates to organic polymer composite biological polysaccharide conductive hydrogel as well as a preparation method and application thereof. The preparation method of the organic polymer composite biological polysaccharide conductive hydrogel provided by the invention comprises the following steps: sequentially adding acrylamide, xanthan gum, K-carrageenan, N-N, methylene bisacrylamide and lithium chloride into deionized water, uniformly stirring, introducing nitrogen to remove oxygen, adding ammonium persulfate, centrifuging to remove bubbles, and drying to obtain the organic polymer composite biological polysaccharide conductive hydrogel. Preheating to a reaction temperature, and initiating a free radical polymerization reaction to obtain the organic polymer composite biological polysaccharide conductive hydrogel. The bottleneck of the mechanical property of the material is broken through, so that the prepared material realizes high toughness (namely, high strength, high stretchability and high fracture energy) and excellent elastic recovery capability.

Description

Technical Field

[0001] This invention belongs to the field of organic polymer composite materials and flexible electronics technology, and specifically relates to a hydrogel material constructed by combining organic polymers and natural biological polysaccharides, which has excellent mechanical properties, conductivity and self-healing properties, its preparation method, and its specific application in flexible electronic devices. Background Technology

[0002] Among numerous materials, hydrogels, as a type of soft polymer material composed of a three-dimensional hydrophilic polymer network and a large amount of water, stand out due to their unique "soft-wet" properties, tunable physicochemical properties, and high similarity to biological tissues. They are regarded as an ideal platform for constructing flexible electronic devices, especially showing great application potential in fields such as biomimetic sensing, human-computer interaction interfaces, and sustainable energy systems.

[0003] Combining the flexibility and conductivity of hydrogels makes them ideal sensitive materials for the direct electrical conversion of physical signals such as strain and pressure. Polyacrylamide (PAM) hydrogels, in particular, are often used as matrix materials for conductive hydrogels due to their controllable synthesis, regular chain structure, high transparency, and good elasticity. However, traditional chemically cross-linked PAM hydrogels face a fundamental dilemma: while their covalent cross-linked network provides basic elasticity, their energy dissipation mechanism is singular, resulting in low fracture strength and toughness on a macroscopic scale, making them highly susceptible to brittle fracture under tension or compression. Furthermore, once the covalent network is damaged, the structural destruction is often permanent and irreversible, severely limiting their reliability and lifespan in complex environments. On the other hand, although some high-strength hydrogels based on strong non-covalent interactions (such as crystallization and nanocomposites) have been developed, these often come at the cost of sacrificing elasticity, self-healing properties, or transparency, making it difficult to meet the demands of multifunctionality. Therefore, how to overcome the bottleneck of material mechanical properties and achieve a combination of high toughness (i.e., high strength, high tensile strength, and high fracture energy) and excellent elastic recovery ability has become a key challenge for hydrogels to move towards practical applications. Summary of the Invention

[0004] To address the shortcomings of the existing technologies, the present invention aims to provide a method for preparing and applying an organic polymer composite biopolysaccharide conductive hydrogel, thereby overcoming the bottleneck of material mechanical properties and enabling the prepared material to achieve high toughness (i.e., simultaneously possessing high strength, high tensile strength, and high fracture energy) and excellent elastic recovery ability.

[0005] To address the aforementioned technical problems, this invention provides a method for preparing an organic polymer composite biopolysaccharide conductive hydrogel, comprising the following steps: Acrylamide, xanthan gum, K-carrageenan, NN, methylenebisacrylamide, and lithium chloride were added to deionized water in sequence, stirred evenly, and nitrogen gas was introduced to remove oxygen. Ammonium persulfate was then added, and after centrifugation to remove bubbles, the mixture was preheated to the reaction temperature to initiate a free radical polymerization reaction, thereby obtaining an organic polymer composite biopolysaccharide conductive hydrogel. Preferably, the mass fraction of acrylamide in the deionized aqueous solution is 5% to 20%.

[0006] Preferably, the mass fraction of xanthan gum in the deionized aqueous solution is 0.25% to 1.5%.

[0007] Preferably, the mass fraction of K-carrageenan in the deionized aqueous solution is 0.19% to 1%.

[0008] Preferably, the mass fraction of N,methylenebisacrylamide in the deionized aqueous solution is 0.00125%~0.0125%.

[0009] Preferably, the mass fraction of ammonium persulfate in the deionized aqueous solution is 0.125% to 1.25%.

[0010] Preferably, the concentration of lithium chloride is 1 mol / L to 6 mol / L.

[0011] Preferably, the reaction temperature is 55℃~75℃ and the reaction time is 1h~3h.

[0012] This invention provides a method for preparing an organic polymer composite biopolysaccharide conductive hydrogel, thereby obtaining the organic polymer composite biopolysaccharide conductive hydrogel.

[0013] This invention provides an application of an organic polymer composite biopolysaccharide conductive hydrogel in flexible electronic devices.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention prepares a high-toughness, self-healing PAM / XG / K-carrageenan composite conductive hydrogel (PAM / XG / CG / Li) via one-step free radical polymerization. + In this method, xanthan gum (XG) is an anionic polysaccharide produced by microbial fermentation, with a unique rigid rod-like helical structure and ultra-long chain length. When introduced into a polyacrylamide (PAM) network, the long XG chains can form strong physical entanglement with the PAM chains, and form dense hydrogen bonds with the amide groups on the PAM chains through the carboxyl groups on its side chains. Physical entanglement and hydrogen bonds can serve as efficient energy dissipation centers, preferentially breaking under external forces to absorb a large amount of energy, thereby significantly improving the toughness, tear resistance, and fatigue resistance of the hydrogel. K-carrageenan is a sulfated linear polysaccharide extracted from red algae, with sulfated groups (-OSO3) on its molecular chain.- It can react with metal cations in solution (such as Li) + K + Ca 2+ Specific interactions occur between K-carrageenan and other molecules, forming a reversible and heat-sensitive helical-coil transition and a three-dimensional "egg-box" ionic cross-linked structure. This dynamic physical cross-linked network dominated by ionic bonds endows the hydrogel with excellent self-healing properties. When the material is damaged, the ionic bonds at the fracture site can quickly dissociate and recombine, achieving autonomous interface healing. Lithium chloride (LiCl) not only serves as an ionic cross-linking agent for K-carrageenan but also as a conductive medium, enabling the hydrogel to possess stable ionic conductivity.

[0015] In summary, this invention constructs an interpenetrating three-phase composite material system with chemically cross-linked PAM as the rigid / elastic framework and XG and K-carrageenan forming a flexible and reversible sacrificial network through multiple hydrogen bonds and dynamic ionic bonds. The PAM network ensures the integrity of the overall structure and rapid rebound, XG contributes to initial energy dissipation and toughening, while K-carrageenan is responsible for dynamic repair and additional reinforcement. The introduction of the electrolyte salt LiCl further enhances the overall structure. Through synergistic effects at the molecular level, these three components result in an organic polymeric composite biopolysaccharide conductive hydrogel that simultaneously possesses the advantages of high toughness, self-healing, and stable conductivity. Attached Figure Description

[0016] Figure 1 The organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) prepared in Example 45 of this invention + Infrared spectrum of DN).

[0017] Figure 2 The organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) prepared in Example 45 of this invention + SEM images of DN, where a is a 100μm SEM image; b is a 50μm SEM image; c is a 20μm SEM image; and d is a 10μm SEM image.

[0018] Figure 3 The organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) prepared in Example 45 of this invention + Cyclic hysteresis curves of DN under different strain conditions.

[0019] Figure 4 The organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) prepared in Example 45 of this invention + DN) in the cyclic hysteresis curve at a strain of 1700%.

[0020] Figure 5The organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) prepared in Example 45 of this invention + The conductive sensing application curves of DN are shown, with the left figure showing the detection of human movement when the wrist is bent and the right figure showing the detection of human movement when writing the number 1.

[0021] Figure 6 The organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) prepared in Example 45 of this invention + Test chart of transmittance and haze of DN). Detailed Implementation

[0022] The specific embodiments of the present invention are described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Unless otherwise specified, the experimental methods described in the embodiments of the present invention are conventional methods.

[0023] It should be noted that when numerical ranges are involved in this invention, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as in Examples 1 to 48, preferred embodiments are described in this invention to avoid redundancy. However, this invention is not limited to these, but can be specifically implemented in other ways within the scope of the technical solutions defined in the appended claims. All raw materials, reagents, instruments, and equipment used in the following embodiments of this invention can be purchased from the market or prepared by existing methods.

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, using preferred embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Example 1 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.25%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0026] Example 2 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.33%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0027] Example 3 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0028] Example 4 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.53%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0029] Example 5 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate free radical polymerization, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fractions of acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and ammonium persulfate in the deionized water were 13.3%, 0.67%, 0.67%, 0.005%, and 0.5%, respectively.

[0030] Example 6 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 1h to initiate free radical polymerization, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0031] Example 7 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 1.5h to initiate free radical polymerization, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0032] Example 8 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0033] Example 9 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2.5h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0034] Example 10 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 3h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0035] Example 11 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 55℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0036] Example 12 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 60℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0037] Example 13 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0038] Example 14 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 70℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0039] Example 15 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 75℃ and reacted for 2h to initiate free radical polymerization, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0040] Example 16 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.33%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0041] Example 17 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.5%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0042] Example 18 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0043] Example 19 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.83%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0044] Example 20 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 1%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0045] Example 21 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 20mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 20%; xanthan gum was 1%; K-carrageenan was 0.65%; NN,methylenebisacrylamide was 0.0075%; and ammonium persulfate was 0.75%.

[0046] Example 22 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 25mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 16%; xanthan gum was 0.8%; K-carrageenan was 0.52%; NN,methylenebisacrylamide was 0.006%; and ammonium persulfate was 0.6%.

[0047] Example 23 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0048] Example 24 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 35mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 11.4%; xanthan gum was 0.57%; K-carrageenan was 0.37%; NN,methylenebisacrylamide was 0.0043%; and ammonium persulfate was 0.43%.

[0049] Example 25 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 40mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.5%; K-carrageenan was 0.325%; NN,methylenebisacrylamide was 0.00375%; and ammonium persulfate was 0.375%.

[0050] Example 26 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 6.7%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0051] Example 27 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 8.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0052] Example 28 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0053] Example 29 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 11.7%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0054] Example 30 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 13.3%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0055] Example 31 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.17%.

[0056] Example 32 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.33%.

[0057] Example 33 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0058] Example 34 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.67%.

[0059] Example 35 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.83%.

[0060] Example 36 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.0017%; and ammonium persulfate was 0.5%.

[0061] Example 37 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.0033%; and ammonium persulfate was 0.5%.

[0062] Example 38 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0063] Example 39 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.0067%; and ammonium persulfate was 0.5%.

[0064] Example 40 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 30mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.0083%; and ammonium persulfate was 0.5%.

[0065] Example 41 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 20mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 20%; xanthan gum was 1.5%; K-carrageenan was 1%; NN,methylenebisacrylamide was 0.0125%; and ammonium persulfate was 1.25%.

[0066] Example 42 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 0g lithium chloride were added sequentially to 40mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30min. After purging with oxygen for 30min, ammonium persulfate was added. After centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 5%; xanthan gum was 0.25%; K-carrageenan was 0.19%; NN,methylenebisacrylamide was 0.00125%; and ammonium persulfate was 0.125%.

[0067] The above Examples 1 to 42 all successfully prepared organic polymer composite biopolysaccharide conductive hydrogels. The organic polymer composite biopolysaccharide conductive hydrogels prepared in Examples 1 to 40 were subjected to mechanical testing. The toughness and tensile properties were tested using a rubber tensile testing machine (ZQ-990LA) with a 5Kg sensor, a gauge length of 20mm, and a speed of 40mm / min. A dumbbell-type double-headed clamp was used for measurement. The test results are as follows.

[0068] Table 1 shows the stress-strain test results of the organic polymer composite biopolysaccharide conductive hydrogels prepared in Examples 1 to 40. Based on the optimal stress-strain condition of the organic polymer composite biopolysaccharide conductive hydrogels prepared in Examples 1 to 40 of Table 1 above, Example 38 is selected as the optimal preparation method for the organic polymer composite biopolysaccharide conductive hydrogel.

[0069] Example 43 A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 1 mol / L lithium chloride were added sequentially to 30 mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30 min. After purging with oxygen for 30 min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2 h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0070] Example 44 The only difference between Example 44 and Example 43 is that the amount of lithium chloride added is 2 mol / L.

[0071] A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN,methylenebisacrylamide, and 2 mol / L lithium chloride were sequentially added to 30 mL of deionized water. The mixture was stirred with a glass rod until homogeneous, then stirred with a magnetic stirrer at a suitable speed for 30 min. After purging with oxygen for 30 min, ammonium persulfate was added. Following centrifugation to remove air bubbles, the mixture was preheated to a reaction temperature of 65℃ and reacted for 2 h to initiate a free radical polymerization reaction, yielding an organic polymer composite biopolysaccharide conductive hydrogel. The mass fraction of acrylamide in the deionized water was 10%; xanthan gum was 0.67%; K-carrageenan was 0.43%; NN,methylenebisacrylamide was 0.005%; and ammonium persulfate was 0.5%.

[0072] Example 45 The only difference between Example 45 and Example 43 is that the amount of lithium chloride added is 3 mol / L.

[0073] Example 46 The only difference between Example 44 and Example 43 is that the amount of lithium chloride added is 4 mol / L.

[0074] Example 47 The only difference between Example 44 and Example 43 is that the amount of lithium chloride added is 5 mol / L.

[0075] Example 48 The only difference between Example 44 and Example 43 is that the amount of lithium chloride added is 6 mol / L.

[0076] The organic polymer composite biopolysaccharide conductive hydrogels prepared in Examples 38, 43 to 48 were subjected to toughness testing. The toughness and tensile properties were tested using a rubber tensile testing machine (ZQ-990LA) with a 5kg sensor, a gauge length of 20mm, and a speed of 40mm / min. A dumbbell-type double-headed clamp was used for measurement. The measurement results are shown in Table 2.

[0077] Table 2 shows the stress-strain test results of the organic polymer composite biopolysaccharide conductive hydrogels prepared in Examples 38 and 43-48. Based on the stress-strain test results of the organic polymer composite biopolysaccharide conductive hydrogels prepared in Examples 38, 43 to 48, Example 45 was selected as the best example.

[0078] The organic polymer composite biopolysaccharide conductive hydrogel prepared in Example 45 was washed several times with anhydrous ethanol to remove unreacted monomers, then torn into small pieces and dried in an oven at 70°C for 24 hours for performance analysis.

[0079] Experimental verification (a) Structural characterization (1) Infrared spectroscopy analysis Depend on Figure 1 It can be seen that at 1695cm -1 and 1630cm -1 The absence of characteristic C=C double bond peaks within the range confirms that the polymerization reactions of monomers such as acrylamide (AM) and N,N-methylenebisacrylamide (MBA) have been completed. Other key peak positions in the spectrum are also reasonably explained: 3340 cm⁻¹. -1 The broad peak at 3186 cm⁻¹ represents the stretching vibration of the hydroxyl groups (-OH) in xanthan gum (XG) and K-carrageenan (CG); -1 The peak at 2900 cm⁻¹ is related to the NH stretching vibration of the secondary amide group (-NH⁻) in polyacrylamide; -1 The signal at this location originates from the vibrations of alkyl chains (-CH2- and -CH-) in various components; 1730 cm⁻¹ -1The peak at 1670 cm⁻¹ corresponds to the stretching of the carbonyl group (C=O) of xanthan gum acetate; -1 The strong peak at 1620 cm⁻¹ belongs to the carbonyl stretching vibration of the amide I band; -1 and 1415cm -1 The bimodal distribution at the xanthan gum ion (-COO) indicates the carboxyl group (-COO). - Asymmetric and symmetric vibrations; 1250cm -1 The position represents the asymmetric stretching of K-carrageenan sulfate (-S=O); 1100 cm -1 Nearby, skeletal vibrations of the sugar ring ether bond (COC) are observed; 930 cm⁻¹ -1 The presence of this precipitate is attributed to the COC vibration of the K-carrageenan internal ether structure. In summary, infrared spectroscopy fully demonstrates that reactants such as AM, XG, and CG have effectively participated in copolymerization.

[0080] (2) SEM Example 43 shows the preparation of an organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li). + The superior macroscopic mechanical properties exhibited by DN are essentially due to its unique multi-level structural design at the microscale. Figure 2 Scanning electron microscope images of an organic polymer composite biopolysaccharide conductive hydrogel at different magnifications (500X, 880X, 1350X, 3500X). Figure 2 Figures a through d show the highly continuous three-dimensional honeycomb network structure formed within the material. This biomimetic multi-level structure achieves synergistic enhancement of mechanical properties through multiple energy dissipation mechanisms: the rigid network forms the main load-bearing skeleton, providing basic strength and initiating initial energy dissipation; the flexible network, as a stress transfer medium, achieves uniform stress distribution through the extension and recombination of molecular chains; and the uniformly distributed microporous structure significantly improves the material's fracture toughness by deflecting and passivating microcrack propagation paths. Furthermore, the dynamic reversible coordination bonds formed by the introduction of lithium ions provide additional energy dissipation pathways. This multi-scale synergistic mechanism enables the hydrogel to simultaneously achieve an excellent combination of high strength, high toughness, and large deformation capacity on a macroscopic scale, and this structure-performance correlation provides an important theoretical basis for its application in the field of advanced materials.

[0081] (0) Performance Analysis (1) Cyclic hysteresis curve To investigate the conductive hydrogel of organic polymer composite biopolysaccharide (PAM / XG / CG / Li) + To investigate the energy dissipation mechanism of DN (density dissipation), this study conducted systematic continuous loading and unloading tensile experiments. Figure 3As the strain gradually increases from 100% to 1700%, the material exhibits significant stress-strain hysteresis during cyclic loading, with the hysteresis loop area directly reflecting the energy dissipation level in a single cycle. This energy dissipation primarily stems from the sequential activation of multi-scale sacrificial units within the gel network: in the initial stage of deformation, dynamically reversible bonds such as ionic bonds and hydrogen bonds mediated by metal ions preferentially break, efficiently dissipating energy through rapid breakage-reorganization cycles; as the strain further increases, irreversible disentanglement of polymer chains and destruction of chemical cross-linking points begin to dominate the dissipation process, causing permanent damage but providing the material with a greater energy absorption capacity. Notably, the overlapping region of adjacent hysteresis loops reflects the elastic recovery capability contributed by the covalent cross-linked network, ensuring the structural integrity of the material. This multi-level energy dissipation mechanism, characterized by preferential activation of reversible sacrificial bonds and subsequent triggering by permanent damage, synergistically endows this dual-network hydrogel with excellent toughness and fatigue resistance.

[0082] To investigate the conductive hydrogel of organic polymer composite biopolysaccharide (PAM / XG / CG / Li) + To investigate the energy dissipation mechanism of DN (density dissipation), this study conducted systematic continuous loading and unloading tensile experiments. Figure 4 As the strain gradually increases from 100% to 1700%, the material exhibits significant stress-strain hysteresis during cyclic loading, with the hysteresis loop area directly reflecting the energy dissipation level in a single cycle. This energy dissipation primarily stems from the sequential activation of multi-scale sacrificial units within the gel network: in the initial stage of deformation, dynamically reversible bonds such as ionic bonds and hydrogen bonds mediated by metal ions preferentially break, efficiently dissipating energy through rapid breakage-reorganization cycles; as the strain further increases, the irreversible disentanglement of polymer chains and the destruction of chemical cross-linking points begin to dominate the dissipation process, causing permanent damage but providing the material with a greater energy absorption capacity. Notably, the overlapping region of adjacent hysteresis loops reflects the elastic recovery capability contributed by the covalent cross-linked network, ensuring the structural integrity of the material. This multi-level energy dissipation mechanism, characterized by preferential activation of reversible sacrificial bonds and subsequent triggering by permanent damage, synergistically endows this dual-network hydrogel with excellent toughness and fatigue resistance.

[0083] (3) Application of conductive sensing Organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) + The pressure-sensing performance of DN (dielectric density) is partly derived from its conductivity, and it can be used in human motion detection. PAM / XG / CG / Li + DN exhibits excellent flexible mechanical properties and electrical conductivity, and human motion signals were recorded during testing. An organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) was measured using a dual-probe testing kit with a digital multimeter (Keithley, 2400).+ The change in human motion signal of DN), where (ΔR / R) = (RP-R) / R, (RP and R correspond to the sensor resistance values ​​under pressure and without pressure, respectively). Figure 5 It can be observed that the ΔR / R signal affects wrist flexion (e.g., Figure 5 The reciprocating motion (as shown in the left image) generates a response and displays a cyclical signal. The image distinguishes the motion of the human body writing, showing the repeated writing of the digit "1" (as shown in the left image). Figure 5 (See the right figure). ΔR / R shows a continuous signal change. The signal change in the writing digit response differs from the signal change in the wrist flexion response. Therefore, the organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) + DN has potential applications in detecting different motion changes.

[0084] (1) Transmittance and haze test Figure 6 A diagram of the equipment for light transmittance and haze, from Figure 6 As can be seen from the data, the organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) + DN exhibits excellent overall optical performance, with a transmittance of up to 95% while maintaining a haze of 19.99%. The high transmittance of 95% demonstrates the high homogeneity and density of the hydrogel's internal structure. Despite being composed of a complex double-crosslinked network of three polymers (PAM, XG, CG), the components exhibit excellent compatibility. + The introduction of [a specific component] further promotes the stability and refinement of the network structure through ionic coordination with polymer chains (especially the sulfate groups of carrageenan). The physical cross-linking points (such as hydrogen bonds and ionic bonds) formed by these interactions, and the resulting microstructure, are effectively controlled to a nanoscale size much smaller than the wavelength of visible light. This minimizes light scattering or reflection caused by large defects or strong phase separation interfaces during propagation, allowing most light to pass through in a straight line, resulting in a clear and transparent appearance like glass. The 19.99% haze indicates the presence of numerous nanoscale scattering centers with minute differences in refractive index within the material. These scattering centers likely originate from CG / Li [a specific component]. + The nanoscale microregions formed by the composite, the density fluctuations of the dual-network crosslinking points, and the inherent inhomogeneity of the polymer chain entanglement are not enough to block the passage of light, but they can effectively soften and homogenize transmitted light, transforming direct, intense light into softer, more uniform diffused light.

[0085] Organic polymer composite biopolysaccharide conductive hydrogel (PAM / XG / CG / Li) +DN successfully combines extremely high transparency with controllable light scattering capabilities, achieving the ideal optical properties of "high light transmittance and high diffusion." This makes it transcend traditional materials that solely pursue high transparency, becoming a high-performance, high-end optical functional gel. It shows great application potential in fields that require simultaneous high light transmittance and glare-free, uniform illumination, such as light guide plates for flexible displays, high-quality LED lamp covers, transparent encapsulation layers for wearable devices, and scaffolds for bioengineering.

[0086] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for preparing an organic polymer composite biopolysaccharide conductive hydrogel, characterized in that, Includes the following steps: Acrylamide, xanthan gum, K-carrageenan, NN, methylenebisacrylamide, and lithium chloride were added sequentially to deionized water, stirred evenly, and nitrogen gas was introduced to remove oxygen. Ammonium persulfate was then added, and after centrifugation to remove bubbles, the mixture was preheated to the reaction temperature to initiate a free radical polymerization reaction, thereby obtaining an organic polymer composite biopolysaccharide conductive hydrogel.

2. The preparation method of the organic polymer composite biopolysaccharide conductive hydrogel according to claim 1, characterized in that, The acrylamide has a mass fraction of 5% to 20% in the deionized aqueous solution.

3. The preparation method of the organic polymer composite biopolysaccharide conductive hydrogel according to claim 1, characterized in that, The xanthan gum has a mass fraction of 0.25% to 1.5% in the deionized aqueous solution.

4. The preparation method of the organic polymer composite biopolysaccharide conductive hydrogel according to claim 1, characterized in that, The mass fraction of K-carrageenan in the deionized aqueous solution is 0.19%~1%.

5. The preparation method of the organic polymer composite biopolysaccharide conductive hydrogel according to claim 1, characterized in that, The NN,methylenebisacrylamide has a mass fraction of 0.00125% to 0.0125% in deionized aqueous solution.

6. The method for preparing the organic polymer composite biopolysaccharide conductive hydrogel according to claim 1, characterized in that, The mass fraction of the ammonium persulfate in the deionized aqueous solution is 0.125% to 1.25%.

7. The preparation method of the organic polymer composite biopolysaccharide conductive hydrogel according to claim 1, characterized in that, The concentration of lithium chloride is 1 mol / L to 6 mol / L.

8. The method for preparing the organic polymer composite biopolysaccharide conductive hydrogel according to claim 1, characterized in that, The reaction temperature is 55℃~75℃, and the reaction time is 1h~3h.

9. The organic polymer composite biopolysaccharide conductive hydrogel prepared by the method according to any one of claims 1 to 8.

10. The application of the organic polymer composite biopolysaccharide conductive hydrogel according to claim 9 in flexible electronic devices.

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