Superstretched ionogels, their preparation methods and applications
By preparing superstretched ion gels, the problem of poor stretching properties of conventional ion gels was solved, achieving a combination of high stretching properties and high ionic conductivity, which is suitable for flexible sensors.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN UNIV
- Filing Date
- 2023-05-06
- Publication Date
- 2026-05-26
Smart Images
Figure CN116444739B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of ionogel technology, and in particular to an ultrastretched ionogel, its preparation method, and its application. Background Technology
[0002] With the rapid development of science and technology and the increasing demand for artificial intelligence and various human-computer interfaces, flexible wearable sensing electronic devices have received increasing attention and have thus achieved rapid development. Compared with traditional rigid sensors, flexible sensors not only have excellent sensing and detection performance, but also have the characteristics of being stretchable, bendable, and easy to apply, making them important for applications in many fields such as human motion, health monitoring, and soft robotic electronic skin.
[0003] In conventional techniques, the gel system used to prepare electronic skin is a hydrogel system. However, long-term exposure of hydrogels to the working environment can lead to water evaporation, which in turn damages the hydrogel's performance. Therefore, ion gels with good mechanical flexibility and environmental stability have begun to be widely used in flexible sensors. However, conventional ion gels have poor tensile properties, which limits their application in flexible sensors.
[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention
[0005] The main objective of this application is to provide a super-stretchable ion gel, its preparation method, and its application, aiming to solve the technical problem of poor stretchability of conventional ion gels.
[0006] To achieve the above objectives, this application provides a method for preparing a superstretched ionogel, the method comprising the following steps:
[0007] The olefin monomer was dissolved in water, and biopolymers and metal salts were added and stirred until homogeneous to obtain precursor fluid A.
[0008] The ionic liquid and organic solvent were mixed evenly, and a thermal initiator was added and stirred evenly to obtain precursor liquid B;
[0009] After the precursor fluid A and the precursor fluid B are mixed evenly, they are poured into a reaction mold and polymerized at 25-80℃ for 3-48 hours to obtain an ultra-stretched ionic gel.
[0010] Optionally, the step of uniformly mixing the ionic liquid with the organic solvent and adding a thermal initiator to stir until uniform to obtain precursor liquid B includes:
[0011] The ionic liquid and organic solvent were mixed evenly, and a thermal initiator was added and stirred until uniform. Then, a crosslinking agent was added and stirred until uniform to obtain precursor liquid B.
[0012] The crosslinking agent comprises one or more of polyethylene glycol diacrylate, divinylbenzene, ethylene glycol dimethacrylate, zinc dimethacrylate, benzoate, bis(2-methacryloyloxy)ethyl, tetraethylene glycol diacrylate, and pentaerythritol tetraacrylate, wherein the crosslinking agent accounts for 0.1-10% of the molar ratio of the olefin monomer.
[0013] Optionally, the olefin monomer comprises one or more of the following: 2-acrylic acid, acrylate, 2-acrylamido-2-methyl-1-propanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, α-methacrylic acid, hydroxypropyl acrylate, butyl methacrylate, 2,2,2-trifluoroethyl acrylate, acrylamide, methacrylamide, N-hydroxymethylacrylamide, N-methyl-2-acrylamide, sodium α-alkenylsulfonate, sodium aminosulfonate, 3-hydroxypropanesulfonic acid, sodium vinylsulfonate, and 3-aminopropanesulfonic acid.
[0014] Optionally, the ionic liquid comprises one or more of the following: 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-butyl-3-methylimidazolium hexafluorophosphate, 4-(benzoic acid)triethylamine bromide, tributylmethylammonium chloride, tributylmethylammonium bis(trifluoromethanesulfonyl)imide, 1-butylpyridine bromide, and 1-butylpyridine chloride, wherein the ionic liquid accounts for 1-30% of the molar ratio of the olefin monomer.
[0015] Optionally, the biopolymer includes one or more of polyamide polymers, nucleic acids, and polysaccharides, wherein the biopolymer accounts for 1-50% of the molar ratio of the olefin monomer.
[0016] Optionally, the metal salt includes one or more of LiX, ZnX2, AlX3, and ZrX4, wherein X is one or more of fluorine, chlorine, bromine, and iodine, and the metal salt accounts for 1-40% of the molar ratio of the olefin monomer.
[0017] Optionally, the organic solvent includes one or more of dimethyl sulfoxide, methanol, ethylene glycol, and glycerol, wherein the organic solvent accounts for 1-40% of the molar ratio of the olefin monomer, and the water accounts for 1-30% of the molar ratio of the olefin monomer.
[0018] Optionally, the thermal initiator includes one or more of N,N-azobisisobutyronitrile, N,N-azobisisoheptanenitrile, potassium persulfate, and ammonium persulfate, wherein the thermal initiator accounts for 0.1-2% of the molar ratio of the olefin monomer.
[0019] This application also provides a superstretched ionic gel, which is prepared by the above-described method for preparing superstretched ionic gel.
[0020] This application also provides an application of a superstretched ion gel, which is prepared by the above-described method for preparing superstretched ion gel, and its application in the preparation of flexible sensors.
[0021] This application discloses a superstretched ionic gel, its preparation method, and its application. The method involves dissolving an olefin monomer in water, adding a biopolymer and a metal salt, and stirring until homogeneous to obtain a precursor liquid A. Then, the ionic liquid is mixed uniformly with an organic solvent, and a thermal initiator is added and stirred until homogeneous to obtain a precursor liquid B. Finally, the precursor liquid A and the precursor liquid B are mixed uniformly and poured into a reaction mold. The mixture is then polymerized at 25-80°C for 3-48 hours to obtain the superstretched ionic gel. The preparation method of the super-stretchable ionic gel in this application is simple, requiring only the mixing of each component formulation and polymerization reaction at a suitable temperature. In industrial production, existing hydrogel production processes can be utilized without additional equipment investment, showing promising industrialization prospects. By using olefin monomers as the polymer chains of the ionic gel, and then introducing biopolymers to react with the olefin monomers to form hydrogen bonds, the formed hydrogen bonds have high strength, which can improve inter-chain friction and energy dissipation to form a uniform polymer network, thereby uniformly dispersing stress and avoiding stress concentration in the prepared ionic gel. This improves the tensile and puncture resistance of the ionic gel, forming a super-stretchable, puncture-resistant ionic gel. Furthermore, the coordination bonds or ionic interactions formed by the olefin monomers and the added metal salts or ionic liquids enhance the ionic conductivity of the ionic gel, achieving a combination of high ionic conductivity and excellent mechanical properties. Attached Figure Description
[0022] Figure 1 This is a schematic flowchart of the preparation method of the superstretched ionic gel according to an embodiment of this application;
[0023] Figure 2 This is a stress-strain curve diagram of an embodiment of this application;
[0024] Figure 3 This is a puncture curve diagram of an embodiment of this application.
[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.
[0027] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. In addition, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.
[0028] With the rapid development of science and technology and the increasing demand for artificial intelligence and various human-computer interfaces, flexible and wearable sensing electronic devices have attracted more and more attention from researchers and have achieved rapid development. Compared with traditional rigid sensors, flexible sensors not only have excellent sensing and detection performance, but also have the characteristics of being stretchable, bendable, and easy to apply, making them important for applications in many fields such as human motion, health monitoring, and soft robotic electronic skin. Currently, hydrogel systems are commonly used to prepare electronic skin, but long-term exposure of hydrogels to the working environment can lead to water evaporation and performance degradation; in humid environments, the hydrophilic polymer chains contained in hydrogels can absorb water molecules, easily leading to unstable electrical performance; at high temperatures (>100℃) and low temperatures (<0℃), hydrogel conductors lose their original functions, thus limiting the development of flexible sensors; therefore, ionomers with good mechanical flexibility and environmental stability have begun to be widely used in flexible sensors.
[0029] Ionogels are soft materials that, compared to traditional "electronic conductors," offer a wider strain sensing range, high electronic conductivity, and excellent electrochemical stability, making them ideal for stretchable ionogels. Ionogels have been developed to address the bottleneck issues of hydrogels in harsh environments, including high-temperature dehydration and sub-zero freezing. The combination of the diverse properties of ionogels with high conductivity and stability is crucial for meeting the requirements of practical applications in complex scenarios. However, the poor stretchability of conventional ionogels limits their application in flexible sensors.
[0030] In view of this, this application proposes a superstretched ionic gel, its preparation method and application. The method involves dissolving an olefin monomer in water, adding a biopolymer and a metal salt, and stirring until homogeneous to obtain a precursor liquid A. Then, the ionic liquid is mixed uniformly with an organic solvent, and a thermal initiator is added and stirred until homogeneous to obtain a precursor liquid B. Finally, the precursor liquid A and the precursor liquid B are mixed uniformly and poured into a reaction mold, and polymerized at 25-80°C for 3-48 hours to obtain the superstretched ionic gel. The preparation method of the super-stretchable ionic gel in this application is simple, requiring only the mixing of each component formulation and polymerization reaction at a suitable temperature. In industrial production, existing hydrogel production processes can be utilized without additional equipment investment, showing promising industrialization prospects. By using olefin monomers as the polymer chains of the ionic gel, and then introducing biopolymers to react with the olefin monomers to form hydrogen bonds, the formed hydrogen bonds have high strength, which can improve inter-chain friction and energy dissipation to form a uniform polymer network, thereby uniformly dispersing stress and avoiding stress concentration in the prepared ionic gel. This improves the tensile and puncture resistance of the ionic gel, forming a super-stretchable, puncture-resistant ionic gel. Furthermore, the coordination bonds or ionic interactions formed by the olefin monomers and the added metal salts or ionic liquids enhance the ionic conductivity of the ionic gel, achieving a combination of high ionic conductivity and excellent mechanical properties.
[0031] The first aspect of this application provides a method for preparing a superstretched ionogel, the method comprising the following steps:
[0032] Step S10: Dissolve the olefin monomer in water, add the biopolymer and metal salt and stir until homogeneous to obtain precursor fluid A;
[0033] The olefin monomer was dissolved in an aqueous solution, and a biopolymer was added to the olefin monomer solution and stirred until homogeneous. Then, a metal salt was added and stirred until homogeneous again to obtain precursor fluid A.
[0034] In one feasible embodiment, the olefin monomer comprises one or more of the following: 2-acrylic acid, acrylate, 2-acrylamido-2-methyl-1-propanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, α-methacrylic acid, hydroxypropyl acrylate, butyl methacrylate, 2,2,2-trifluoroethyl acrylate, acrylamide, methacrylamide, N-hydroxymethylacrylamide, N-methyl-2-acrylamide, sodium α-alkenylsulfonate, sodium aminosulfonate, 3-hydroxypropanesulfonic acid, sodium vinylsulfonate, and 3-aminopropanesulfonic acid.
[0035] In another feasible embodiment, the olefin monomer is two different types of olefin monomers, and the molar ratio of the two different types of olefin monomers is 1:10 to 10:1.
[0036] The olefin monomer is a mixture of two different types of olefin monomers, including: 2-acrylic acid, acrylate, 2-acrylamido-2-methyl-1-propanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, α-methacrylic acid, hydroxypropyl acrylate, butyl methacrylate, 2,2,2-trifluoroethyl acrylate, acrylamide, methacrylamide, N-hydroxymethylacrylamide, N-methyl-2-acrylamide, sodium α-alkenylsulfonate, sodium aminosulfonate, 3-hydroxypropanesulfonic acid, sodium vinylsulfonate, or two of 3-aminopropanesulfonic acid; exemplaryly, the olefin monomer is a soft polymer chain matrix, such as 2-acrylamido-2-methyl-1-propanesulfonic acid, and a hard polymer chain matrix, such as N-hydroxymethylacrylamide, acrylamide, or α-methacrylic acid.
[0037] In this embodiment, by using a mixture of two different types of olefin monomers, the soft polymer chain matrix in the olefin monomer mixture enhances the elongation at break of the ion gel, while the hard polymer chain matrix provides hydrogen bonds for the ion gel, thereby improving the strength of the polymer.
[0038] In one feasible embodiment, the biopolymer comprises one or more of polyamide polymers, nucleic acids, and polysaccharides, wherein the biopolymer accounts for 1-50% of the molar ratio of the olefin monomer.
[0039] Polyamide polymers include one or more of collagen, protein, and polyamino acids; nucleic acids include one or more of deoxyribonucleic acid and ribonucleic acid; polysaccharides include one or more of vitamin B1, starch, chitosan, and xanthan gum.
[0040] In this embodiment, hydrogen bonds are formed by reacting biopolymers with olefin monomers. The formed hydrogen bonds have high strength, which can improve inter-chain friction and energy dissipation to form a uniform polymer network, thereby uniformly dispersing stress and avoiding stress concentration in the prepared ion gel. This improves the tensile and puncture resistance of the ion gel, forming a super-stretchable and puncture-resistant ion gel.
[0041] In one feasible embodiment, the metal salt comprises one or more of LiX, ZnX2, AlX3, and ZrX4, wherein X is one or more of fluorine, chlorine, bromine, and iodine, and the metal salt accounts for 1-40% of the molar ratio of the olefin monomer.
[0042] Step S20: Mix the ionic liquid and organic solvent evenly, and add a thermal initiator and stir evenly to obtain precursor liquid B;
[0043] In one feasible embodiment, step S20, which involves uniformly mixing the ionic liquid with the organic solvent and adding a thermal initiator to stir until homogeneous, to obtain precursor liquid B, includes:
[0044] Step S21: The ionic liquid and organic solvent are mixed evenly, a thermal initiator is added and stirred until uniform, and then a crosslinking agent is added and stirred until uniform to obtain precursor liquid B; wherein, the crosslinking agent includes one or more of polyethylene glycol diacrylate, divinylbenzene, ethylene glycol dimethacrylate, zinc dimethacrylate, benzoate, bis(2-methacryloyloxy)ethyl, tetraethylene glycol diacrylate and pentaerythritol tetraacrylate, and the crosslinking agent accounts for 0.1-10% of the molar ratio of the olefin monomer.
[0045] In this embodiment, a cross-linking agent is introduced into the components to generate chemical bonds between linear molecules, thereby connecting the linear molecules together to form a network structure, which improves the elasticity of the ion gel.
[0046] In one feasible embodiment, the ionic liquid comprises one or more of the following: 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-butyl-3-methylimidazolium hexafluorophosphate, 4-(benzoic acid)triethylamine bromide, tributylmethylammonium chloride, tributylmethylammonium bis(trifluoromethanesulfonyl)imide, 1-butylpyridine bromide, and 1-butylpyridine chloride, wherein the ionic liquid accounts for 1-30% of the molar ratio of the olefin monomer.
[0047] In another feasible embodiment, the organic solvent comprises one or more of dimethyl sulfoxide, methanol, ethylene glycol and glycerol, wherein the organic solvent accounts for 1-40% of the molar ratio of the olefin monomer, and the water accounts for 1-30% of the molar ratio of the olefin monomer.
[0048] In another feasible embodiment, the thermal initiator comprises one or more of N,N-azobisisobutyronitrile, N,N-azobisisoheptanenitrile, potassium persulfate, and ammonium persulfate, wherein the thermal initiator accounts for 0.1-2% of the molar ratio of the olefin monomer.
[0049] Step S30: After the precursor fluid A and the precursor fluid B are mixed evenly, they are poured into a reaction mold and polymerized at a temperature of 25-80℃ for 3-48 hours to obtain an ultra-stretched ionic gel.
[0050] After the precursor fluid A and precursor fluid B are mixed evenly, they are introduced into the reaction mold. For example, the reaction mold is a polytetrafluoroethylene mold. The shape of the reaction mold can be square, round, triangular, etc., and this embodiment does not limit it.
[0051] In this embodiment, precursor liquid A is obtained by dissolving olefin monomers in water, adding biopolymers and metal salts and stirring until homogeneous; then, ionic liquid and organic solvent are mixed evenly, and thermal initiator is added and stirred evenly to obtain precursor liquid B; then, precursor liquid A and precursor liquid B are mixed evenly and poured into a reaction mold, and polymerized at 25-80℃ for 3-48 hours to obtain superstretched ionic gel. The preparation method of the super-stretchable ionic gel in this application is simple, requiring only the mixing of each component formulation and polymerization reaction at a suitable temperature. In industrial production, existing hydrogel production processes can be utilized without additional equipment investment, showing promising industrialization prospects. By using olefin monomers as the polymer chains of the ionic gel, and then introducing biopolymers to react with the olefin monomers to form hydrogen bonds, the formed hydrogen bonds have high strength, which can improve inter-chain friction and energy dissipation to form a uniform polymer network, thereby uniformly dispersing stress and avoiding stress concentration in the prepared ionic gel. This improves the tensile and puncture resistance of the ionic gel, forming a super-stretchable, puncture-resistant ionic gel. Furthermore, the coordination bonds or ionic interactions formed by the olefin monomers and the added metal salts or ionic liquids enhance the ionic conductivity of the ionic gel, achieving a combination of high ionic conductivity and excellent mechanical properties.
[0052] To enable those skilled in the art to clearly understand the details and operations of the above embodiments of this application, and to demonstrate the significant advancements in the performance of the superstretched ionogels, their preparation methods, and applications of the embodiments of this application, the following examples illustrate the above technical solutions.
[0053] Example 1
[0054] Dissolve 2-acrylamido-2-methyl-1-propanesulfonic acid and N-hydroxymethylacrylamide (olefin monomer) in water at a molar ratio of 1:1, then add collagen (biopolymer) at a molar ratio of 2% of the olefin monomer and zinc chloride (metal salt) at a molar ratio of 10% of the olefin monomer and stir until homogeneous to obtain precursor fluid A.
[0055] After mixing 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt (ionic liquid) at 10% of the olefin monomer molar ratio and dimethyl sulfoxide (organic solvent) at 5% of the olefin monomer molar ratio, N,N-azobisisobutyronitrile (thermal initiator) at 1% of the olefin monomer molar ratio is added and stirred evenly to obtain precursor liquid B.
[0056] After the precursor fluid A and the precursor fluid B are mixed evenly, they are poured into a polytetrafluoroethylene mold and polymerized at 50°C for 20 hours to obtain an ultra-stretched ionic gel.
[0057] Example 2
[0058] 2-Acrylamido-2-methyl-1-propanesulfonic acid and α-methacrylic acid (olefin monomer) in a molar ratio of 1:1 were dissolved in water. Then, collagen (biopolymer) at a molar ratio of 2% of the olefin monomer and zinc chloride (metal salt) at a molar ratio of 10% of the olefin monomer were added and stirred until homogeneous to obtain precursor fluid A.
[0059] After mixing 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt (ionic liquid) at 10% of the olefin monomer molar ratio and dimethyl sulfoxide (organic solvent) at 5% of the olefin monomer molar ratio, N,N-azobisisobutyronitrile (thermal initiator) at 1% of the olefin monomer molar ratio is added and stirred evenly to obtain precursor liquid B.
[0060] After the precursor fluid A and the precursor fluid B are mixed evenly, they are poured into a polytetrafluoroethylene mold and polymerized at 50°C for 20 hours to obtain an ultra-stretched ionic gel.
[0061] Example 3
[0062] Acrylamide and α-methacrylic acid (olefin monomer) in a molar ratio of 1:1 were dissolved in water, and then collagen (biopolymer) at a molar ratio of 2% and zinc chloride (metal salt) at a molar ratio of 10% were added and stirred until homogeneous to obtain precursor fluid A.
[0063] After mixing 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt (ionic liquid) at 10% of the olefin monomer molar ratio and dimethyl sulfoxide (organic solvent) at 5% of the olefin monomer molar ratio, N,N-azobisisobutyronitrile (thermal initiator) at 1% of the olefin monomer molar ratio is added and stirred evenly to obtain precursor liquid B.
[0064] After the precursor fluid A and the precursor fluid B are mixed evenly, they are poured into a polytetrafluoroethylene mold and polymerized at 50°C for 20 hours to obtain an ultra-stretched ionic gel.
[0065] Example 4
[0066] Dissolve 2-acrylamido-2-methyl-1-propanesulfonic acid and N-hydroxymethylacrylamide (olefin monomer) in water at a molar ratio of 1:1, then add collagen (biopolymer) at a molar ratio of 2% of the olefin monomer and zinc chloride (metal salt) at a molar ratio of 10% of the olefin monomer and stir until homogeneous to obtain precursor fluid A.
[0067] After mixing 10% of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt (ionic liquid) and 5% of dimethyl sulfoxide (organic solvent) in the olefin monomers, N,N-azobisisobutyronitrile (thermal initiator) in the olefin monomers was added and stirred until homogeneous. Finally, polyethylene glycol diacrylate (crosslinking agent) in the olefin monomers was added in the olefin monomers at a ratio of 1% to obtain precursor liquid B.
[0068] After the precursor fluid A and the precursor fluid B are mixed evenly, they are poured into a polytetrafluoroethylene mold and polymerized at 50°C for 20 hours to obtain an ultra-stretched ionic gel.
[0069] Furthermore, to verify the progressiveness of the embodiments of this application, the following performance tests were performed on each embodiment and comparative example:
[0070] 1. Mechanical property testing
[0071] The ionogels prepared in Examples 1-4 were subjected to tensile tests, puncture tests, and rebound tests. The experimental results are as follows: Figure 2 , Figure 3 As shown in Table 1:
[0072] Table 1
[0073] Test group Elongation at break / % Puncture resistance distance / mm Rebound rate / % Example 1 19850 ＞48 87 Example 2 12400 35 86 Example 3 8170 32 84 Example 4 14050 36 97
[0074] according to Figure 2 As can be seen from the stress-strain curves and the elongation at break data in Table 1, the ionogel prepared in this application has excellent tensile properties, with the best elongation at break reaching 19850%, making it a super-stretching ionogel. According to... Figure 3 As can be seen from the puncture curves in Table 2 and the puncture resistance distances in Table 2, the ion gels prepared in the embodiments of this application have a puncture resistance distance of up to 48 mm, exhibiting excellent puncture resistance. In addition, the ion gels prepared by adding a crosslinking agent in Example 4 have excellent tensile and puncture resistance properties, and the resilience of the ion gels is significantly improved, with a resilience rate of up to 97%. Therefore, the ion gels prepared in the embodiments of this application all have excellent mechanical properties.
[0075] 2. Ionic conductivity
[0076] The ionogels prepared in Examples 1-4 were subjected to AC impedance testing to obtain the ionic conductivity of each ionogel. The results are shown in Table 2 below:
[0077] Table 2
[0078] Test group <![CDATA[Ionic conductivity / 10 -3 S·cm -1 > Example 1 2.3 Example 2 1.5 Example 3 2.0 Example 4 1.9
[0079] According to the ionic conductivity data in Table 2, the ionic conductivity of the ionogels prepared in Examples 1-4 of this application is between 1.5 × 10⁻⁶. -3 S·cm -1 Up to 2.3×10 -3 S·cm -1 It has high ionic conductivity and excellent electrical conductivity.
[0080] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the patent protection scope of this application.
Claims
1. A method for preparing a superstretched ionic gel, characterized in that, The preparation method includes the following steps: An olefin monomer is dissolved in water, and a biopolymer and a metal salt are added and stirred until homogeneous to obtain precursor body fluid A. The olefin monomer comprises one or more of the following: 2-acrylic acid, acrylate, 2-acrylamido-2-methyl-1-propanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, α-methacrylic acid, butyl methacrylate, acrylamide, methacrylamide, N-hydroxymethylacrylamide, N-methyl-2-acrylamide, sodium α-alkenylsulfonate, sodium aminosulfonate, 3-hydroxypropanesulfonic acid, sodium vinylsulfonate, and 3-aminopropanesulfonic acid; the biopolymer comprises one or more of the following: proteins, nucleic acids, and polysaccharides. The ionic liquid and organic solvent were mixed evenly, and a thermal initiator was added and stirred evenly to obtain precursor liquid B; After the precursor fluid A and the precursor fluid B are mixed evenly, they are poured into a reaction mold and polymerized at 25-80℃ for 3-48 hours to obtain an ultra-stretched ionic gel.
2. The method for preparing the superstretched ionogel as described in claim 1, characterized in that, The step of mixing the ionic liquid with the organic solvent until homogeneous, and then adding a thermal initiator and stirring until homogeneous to obtain precursor liquid B includes: The ionic liquid and organic solvent were mixed evenly, and a thermal initiator was added and stirred until uniform. Then, a crosslinking agent was added and stirred until uniform to obtain precursor liquid B. The crosslinking agent includes one or more of polyethylene glycol diacrylate, divinylbenzene, ethylene glycol dimethacrylate, zinc dimethacrylate, benzoate, bis(2-methacryloyloxy)ethyl, tetraethylene glycol diacrylate and pentaerythritol tetraacrylate, and the crosslinking agent accounts for 0.1-10% of the molar ratio of the olefin monomer.
3. The method for preparing the superstretched ionogel as described in claim 1, characterized in that, The ionic liquid comprises one or more of the following: 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-butyl-3-methylimidazolium hexafluorophosphate, 4-(benzoic acid)triethylamine bromide, tributylmethylammonium chloride, tributylmethylammonium bis(trifluoromethanesulfonyl)imide, 1-butylpyridine bromide, and 1-butylpyridine chloride, wherein the ionic liquid accounts for 1-30% of the molar ratio of the olefin monomer.
4. The method for preparing the superstretched ionogel as described in claim 1, characterized in that, The biopolymer accounts for 1-50% of the molar ratio of the olefin monomer.
5. The method for preparing the superstretched ionogel as described in claim 1, characterized in that, The metal salt includes one or more of LiX, ZnX2, AlX3 and ZrX4, wherein X is one or more of fluorine, chlorine, bromine and iodine, and the metal salt accounts for 1-40% of the molar ratio of the olefin monomer.
6. The method for preparing the superstretched ionogel as described in claim 1, characterized in that, The organic solvent includes one or more of dimethyl sulfoxide, methanol, ethylene glycol and glycerol, wherein the organic solvent accounts for 1-40% of the molar ratio of the olefin monomer, and the water accounts for 1-30% of the molar ratio of the olefin monomer.
7. The method for preparing the superstretched ionogel as described in claim 1, characterized in that, The thermal initiator includes one or more of N,N-azobisisobutyronitrile, N,N-azobisisoheptanenitrile, potassium persulfate, and ammonium persulfate, and the thermal initiator accounts for 0.1-2% of the molar ratio of the olefin monomer.
8. A superstretchable ionogel, characterized in that, The superstretched ionogel is prepared by the method described in any one of claims 1-7.
9. An application of a superstretchable ionogel, characterized in that, The superstretched ionogel is prepared by the method described in any one of claims 1-7, and the superstretched ionogel is used in the preparation of flexible sensors.