Fabrication of multifunctional conductive composite hydrogels based on nanocellulose

Abstract

The present invention adds tannic acid to a cellulose nanocrystal suspension to obtain cellulose nanocrystals surface-modified with tannic acid, and then forms a composite of single-layer Mxene and cellulose nanocrystals surface-modified with tannic acid, and uses acrylamide as a polymer gel network, adds N,N'methylenebisacrylamide as a crosslinking agent, adds ammonium persulfate as an initiator, and N,N,N',N'-tetramethylethylenediamine as an accelerator, to produce a nanocellulose-based multifunctional conductive composite hydrogel through thermal polymerization. The production method of the present invention is based on the composite of nanocellulose, and the nanocellulose-based multifunctional conductive composite hydrogel produced by a simple and low-cost method has excellent mechanical strength, good fatigue resistance and biocompatibility properties.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed with the China Patent Office on August 12, 2022, bearing application number CN202210967732.2 and entitled "Method for manufacturing multifunctional conductive composite hydrogel based on nanocellulose," the entire contents of which are incorporated herein by reference.

[0002] The present invention belongs to the technical field of nanocellulose materials and relates to a nanocellulose-based composite hydrogel and a method for producing the same. [Background technology]

[0003] The information disclosed in this background section is intended only to enhance understanding of the general background of the present invention and does not necessarily constitute an admission or in any way suggest that the organization of this information constitutes prior art known to those skilled in the art.

[0004] Hydrogels are a type of water-rich functional material with a three-dimensional hydrophilic network structure that has shown potential applications in biomedicine, drug carriers, and sensors. However, single-network hydrogels have drawbacks such as poor mechanical performance and single functionality, severely limiting their application range. While traditional composite hydrogel fabrication strategies have focused on nanocomposites, the introduction of non-covalent bonds into the gel network allows for the realization of the excellent multifunctional properties of hydrogels.

[0005] Cellulose is one of the most abundant, renewable, and biodegradable natural polymers and is widely used in the textile, paper, film, and polymer industries. Nanocellulose, obtained through mechanical and chemical processing, has advantages such as a large specific surface area, ample space for modification, reinforcement, and recyclability. At the same time, nanocellulose has abundant hydroxyl groups, which can form hydrogen bonds with various molecules and provide abundant cross-linking sites for the construction of composite hydrogels. Surface modification of nanocellulose has been reported to function as a reinforcing agent and rheology modifier, enhancing the mechanical properties of hydrogels.

[0006] Currently, there are many multifunctional composite hydrogels based on nanocellulose, but it is difficult to combine characteristics such as excellent mechanical strength, electrical conductivity, and stretchability. Summary of the Invention [Problem to be solved by the invention]

[0007] To solve the above problems, the present invention provides a nanocellulose-based multifunctional conductive composite hydrogel that exhibits multifunctional properties including mechanical toughness, extensibility, and electrical conductivity, and a method for preparing the same. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention employs the following technical means. A first aspect of the present invention provides a method for producing a nanocellulose-based multifunctional conductive composite hydrogel, comprising: Tannic acid (TA) was added to a cellulose nanocrystal (CNC) suspension and reacted to obtain surface-modified cellulose nanocrystals (TA@CNC). The process involves homogeneously mixing the monolayer MXene with the TA@CNC and acrylamide monomer, and then polymerizing it in the presence of a crosslinker, initiator, and accelerator to obtain a nanocellulose-based multifunctional conductive composite hydrogel.

[0009] Based on the existing deficiencies and characteristics of nanocellulose, the present invention provides a nanocellulose-based composite hydrogel that can be highly conductive after introducing and compounding conductive nanoparticles (MXene) through a nanocomposite method, and has excellent mechanical properties, toughness, and conductivity.

[0010] A second aspect of the present invention provides a nanocellulose-based multifunctional conductive composite hydrogel produced by the above method. [Effects of the Invention]

[0011] The beneficial effects of the present invention are: (1) In the manufacturing method of the present invention, a nanocellulose-based multifunctional conductive composite hydrogel is manufactured by a simple and low-cost method based on nanocellulose composite, and has excellent mechanical strength, good fatigue resistance, and biocompatibility.

[0012] (2) In the present invention, by surface modification with tannic acid and compounding with MXene, the composite hydrogel exhibits long-term stable adhesive performance to different interfaces.

[0013] (3) In the present invention, the composite hydrogel is endowed with excellent electrical conductivity by the composite of cellulose nanocrystals surface-modified with tannic acid.

[0014] (4) The manufacturing method of the present invention is simple, highly practical, and easily spread. [Brief explanation of the drawings]

[0015] The specification drawings that form a part of this invention are intended to provide a further understanding of the invention, and the illustrative embodiments of the invention and the description thereof should not be construed as an undue limitation of the invention. [Figure 1] FIG. 2 is a tensile strain diagram of an example of the present invention and a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0016] It should be noted that the following detailed description is all illustrative and is intended to provide further explanation of the present invention. Unless otherwise explained, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0017] Conventional hydrogels have difficulty achieving multifunctional properties, limiting their application range. To address these issues, the first aspect of the present invention provides a method for preparing nanocellulose-based composite hydrogels. Specifically, tannic acid is used to surface-modify cellulose nanocrystals, and then MXene is combined with the surface-modified cellulose nanocrystals (TA@CNC). Polyacrylamide is then used as a polymer network for crosslinking to prepare nanocellulose-based multifunctional composite hydrogels.

[0018] The present invention involves adding tannic acid, cellulose nanocrystals and MXene complexes to a polymer network to prepare a composite hydrogel, with the following main considerations:

[0019] (1) The surface of tannic acid has abundant catechol structures, which on the one hand provide good interfacial adhesion performance to the hydrogel, and at the same time, the nanocomposite composed of cellulose nanocrystals and Mxene provides sufficient noncovalent binding sites for the composite hydrogel network.

[0020] (2) Cellulose nanocrystals act as nano-reinforcers, providing good toughness to the composite hydrogels, and the hydroxyl groups on the surface of the cellulose nanocrystals connect with the gel network through hydrogen bonding.

[0021] (3) Mxene can form a complex with TA@CNC due to the catechol structure on the surface of tannic acid, and the nanomaterial can be uniformly dispersed in the hydrogel network structure, thereby achieving good electrical conductivity through the composite hydrogel.

[0022] In a typical embodiment of the present invention, a method for preparing a nanocellulose-based multifunctional conductive composite hydrogel is provided. TA is added to CNC to obtain TA@CNC, and MXene is added to the TA@CNC to form a composite. Then, a monomeric acrylamide (AAm), a crosslinker N,N'-methylenebisacrylamide (MBA), and an initiator ammonium persulfate (APS) are added to form a nanocellulose-based composite hydrogel.

[0023] In some embodiments of this embodiment, the nanocellulose-based composite hydrogel has TA@CNC as the physical crosslinking site, polyacrylamide (PAAm) as the chemical crosslinking network, and MXene as the electronic conductor, and the nanocellulose-based composite hydrogel prepared with the composite TA@CNC, PAAm, and MXene in the cellulose-based hydrogel exhibits multifunctional properties.

[0024] In one or more specific embodiments of the present invention, the monolayer MXene is a monolayer MXene nanosheet prepared by acid erosion separation.

[0025] In one or more specific embodiments of the invention, the monolayer MXene solution concentration is 0.2%.

[0026] In one or more embodiments of the present invention, the concentration of CNC is 0.5 wt%.

[0027] In one or more embodiments of the present invention, the mass ratio of TA to CNC is 1:4 to 1:6, and all reactions are carried out at room temperature.

[0028] In one or more embodiments of the present invention, after adding TA to the CNC solution, the solution pH is adjusted to 8.1-8.5, 400 μL of MXene solution is added, and the mixture is stirred at 700 rpm for 5 hours.

[0029] In one or more embodiments of the present invention, after the reaction is complete, nitrogen gas is introduced into the solution for 10 minutes to remove oxygen from the solution.

[0030] In one or more embodiments of the present invention, 1.88 g of AAm, 0.069% MBA (mass fraction relative to AAm), 0.35% APS (mass fraction relative to AAm), and 20 μL of N,N,N',N'-tetramethylethylenediamine (TMEDA) are added and mixed at 700 rpm to achieve uniformity. The mixture is then added to a polytetrafluoroethylene mold and placed in a 60°C oven for 20 minutes to react.

[0031] A second aspect of the present invention provides a composite hydrogel obtained by the above-mentioned method for producing a nanocellulose-based composite hydrogel.

[0032] The nanocellulose-based composite hydrogel provided by the present invention has multifunctional properties including mechanical toughness, extensibility, electrical conductivity, etc. [Example]

[0033] The present invention will be described in more detail below with reference to specific examples. However, it should be noted that the specific examples are not limiting but are intended to illustrate the present invention.

[0034] Example 1 (1) Preparation of monolayer MXene: First, 2 g of lithium fluoride was dissolved in 30 mL of 9 mol / L hydrochloric acid solution. The mixture was placed in a polytetrafluoroethylene mold and stirred at 400 rpm for 30 min at room temperature. Then, 2 g of Ti3AlC2 was added and stirred at 35 °C and 400 rpm for 24 h. The stirred solution was placed in a 50 mL centrifuge tube and centrifuged at 4500 rpm for 10 min. The precipitate was collected after the first three centrifugations. The mixture was then centrifuged at 3500 rpm for 10 min until the pH reached ≥ 5. The precipitate was then collected. Subsequently, deionized water was added, ultrasonically crushed for 1 h, and centrifuged at 3500 rpm for 10 min. The supernatant was collected and frozen, then freeze-dried. After 72 h, the mixture was completely dried.

[0035] (2) Preparation of nanocellulose-based composite hydrogel: 1 mL of CNC solution was mixed with 4 mL of deionized water, followed by the addition of 200 μL of MXene and 4.8 mL of deionized water and stirring uniformly. 1.5 mg of TA was added, and the pH was adjusted to 8.1-8.5 with Tris buffer. The mixture was stirred at 700 rpm for 5 h. After the reaction was complete, N2 was introduced into the solution for 1 min to remove gases from the solution. 1.8 g of AAm, 0.069% MBA (relative to AAm), 0.35% APS (relative to AAm), and 20 μL of TMEDA were added and stirred at 700 rpm for 10 min. The mixed solution was then poured into a polytetrafluoroethylene mold and heated in a 60°C oven for 20 min.

[0036] The highly conductive hydrogel prepared in this example can achieve an elongation strain rate of 2354.5% and a toughness of 6.78 MJ / m -3 , adhesive strength is 9.71 KPa, and conductivity is 2.28 × 10 -4 S / cm.

[0037] Example 2 (1) Preparation of monolayer MXene: First, 2 g of lithium fluoride was dissolved in 30 mL of 9 mol / L hydrochloric acid solution. The mixture was placed in a polytetrafluoroethylene mold and stirred at 400 rpm for 30 min at room temperature. Then, 2 g of Ti3AlC2 was added and stirred at 35 °C and 400 rpm for 24 h. The stirred solution was placed in a 50 mL centrifuge tube and centrifuged at 4500 rpm for 10 min. The precipitate was collected after the first three centrifugations. The mixture was then centrifuged at 3500 rpm for 10 min until the pH reached ≥ 5. The precipitate was then collected. Subsequently, deionized water was added, ultrasonically crushed for 1 h, and centrifuged at 3500 rpm for 10 min. The supernatant was collected and frozen, then freeze-dried. After 72 h, the mixture was completely dried.

[0038] (2) Preparation of nanocellulose-based composite hydrogel: 1 mL of CNC solution was mixed with 4 mL of deionized water, followed by the addition of 400 μL of MXene and 4.6 mL of deionized water and stirring uniformly. 1.5 mg of TA was added, and the pH was adjusted to 8.1-8.5 with Tris buffer. The mixture was stirred at 700 rpm for 5 h. After the reaction was complete, N2 was introduced into the solution for 1 min to remove gases from the solution. 1.8 g of AAm, 0.069% MBA (relative to AAm), 0.35% APS (relative to AAm), and 20 μL of TMEDA were added and stirred at 700 rpm for 10 min. The mixture was then poured into a polytetrafluoroethylene mold and heated in a 60°C oven for 20 min.

[0039] The highly conductive hydrogel prepared in this example can achieve a stretching strain of 2717.62%, an adhesive strength of 14.01 KPa, and a toughness of 11.91 MJ / m -3 , conductivity is 2.33×10 -4 S / cm.

[0040] Example 3 (1) Preparation of monolayer MXene: First, 2 g of lithium fluoride was dissolved in 30 mL of 9 mol / L hydrochloric acid solution. The mixture was placed in a polytetrafluoroethylene mold and stirred at 400 rpm for 30 min at room temperature. Then, 2 g of Ti3AlC2 was added and stirred at 35 °C and 400 rpm for 24 h. The stirred solution was placed in a 50 mL centrifuge tube and centrifuged at 4500 rpm for 10 min. The precipitate was collected after the first three centrifugations. The mixture was then centrifuged at 3500 rpm for 10 min until the pH reached ≥ 5. The precipitate was then collected. Subsequently, deionized water was added, ultrasonically crushed for 1 h, and centrifuged at 3500 rpm for 10 min. The supernatant was collected and frozen, followed by freeze-drying. Drying was completed after 72 h.

[0041] (2) Preparation of nanocellulose-based composite hydrogel: 1 mL of CNC solution was mixed with 4 mL of deionized water, followed by the addition of 600 μL of MXene and 4.4 mL of deionized water and stirring until uniform. 1.5 mg of TA was added, and the pH was adjusted to 8.1-8.5 with Tris buffer. The mixture was stirred at 700 rpm for 5 h. After the reaction was complete, N2 was introduced into the solution for 1 min to remove gases from the solution. 1.8 g of AAm, 0.069% MBA (relative to AAm), 0.35% APS (relative to AAm), and 20 μL of TMEDA were added and stirred at 700 rpm for 10 min. The mixture was then poured into a polytetrafluoroethylene mold and placed in a 60°C oven for 20 min.

[0042] The highly conductive hydrogel prepared in this example can achieve an elongation strain of 2414.77%, an adhesive strength of 10.86 KPa, and a toughness of 7.60 MJ / m -3 , conductivity is 2.43 × 10 -4 S / cm.

[0043] Example 4 (1) Preparation of monolayer MXene: First, 2 g of lithium fluoride was dissolved in 30 mL of 9 mol / L hydrochloric acid solution. The mixture was placed in a polytetrafluoroethylene mold and stirred at 400 rpm for 30 min at room temperature. Then, 2 g of Ti3AlC2 was added and stirred at 35 °C and 400 rpm for 24 h. The stirred solution was placed in a 50 mL centrifuge tube and centrifuged at 4500 rpm for 10 min. The precipitate was collected after the first three centrifugations. The mixture was then centrifuged at 3500 rpm for 10 min until the pH reached ≥ 5. The precipitate was then collected. Subsequently, deionized water was added, ultrasonically crushed for 1 h, and centrifuged at 3500 rpm for 10 min. The supernatant was collected and frozen, then freeze-dried. After 72 h, the mixture was completely dried.

[0044] (2) Preparation of nanocellulose-based composite hydrogel: 1 mL of CNC solution was mixed with 4 mL of deionized water, then 800 μL of MXene and 4.2 mL of deionized water were added and stirred uniformly. 1.5 mg of TA was added and the pH was adjusted to 8.1-8.5 with Tris buffer solution. The mixture was stirred at 700 rpm for 5 h. After the reaction was complete, N2 was introduced into the solution for 1 min to remove gas from the solution. 1.8 g of AAm, 0.069% MBA (relative to AAm), 0.35% APS (relative to AAm), and 20 μL of TMEDA were added and stirred at 700 rpm for 10 min. The mixed solution was then poured into a polytetrafluoroethylene mold and heated in a 60°C oven for 20 min.

[0045] The highly conductive hydrogel prepared in this example can achieve an elongation strain of 1893.06%, an adhesive strength of 11.70 KPa, and a toughness of 5.37 MJ / m -3 , conductivity is 2.57×10 -4 S / cm.

[0046] Example 5 (1) Preparation of monolayer MXene: First, 2 g of lithium fluoride was dissolved in 30 mL of 9 mol / L hydrochloric acid solution. The mixture was placed in a polytetrafluoroethylene mold and stirred at 400 rpm for 30 min at room temperature. Then, 2 g of Ti3AlC2 was added and stirred at 35 °C and 400 rpm for 24 h. The stirred solution was placed in a 50 mL centrifuge tube and centrifuged at 4500 rpm for 10 min. The precipitate was collected after the first three centrifugations. The mixture was then centrifuged at 3500 rpm for 10 min until the pH reached ≥ 5. The precipitate was then collected. Subsequently, deionized water was added, ultrasonically crushed for 1 h, and centrifuged at 3500 rpm for 10 min. The supernatant was collected and frozen, then freeze-dried. After 72 h, the mixture was completely dried.

[0047] (2) Preparation of nanocellulose-based composite hydrogel: 1 mL of CNC solution was mixed with 4 mL of deionized water, then 1.5 mL of MXene and 3.5 mL of deionized water were added and stirred uniformly. 1.5 mg of TA was added and the pH was adjusted to 8.1-8.5 with Tris buffer solution. The mixture was stirred at 700 rpm for 5 h. After the reaction was completed, N2 was introduced into the solution for 1 min to remove gas from the solution. 1.8 g of AAm, 0.069% MBA (relative to AAm), 0.35% APS (relative to AAm), and 20 μL of TMEDA were added and stirred at 700 rpm for 10 min. The mixed solution was then poured into a polytetrafluoroethylene mold and heated in a 60°C oven for 20 min.

[0048] The highly conductive hydrogel prepared in this example can achieve a stretching strain of 2321.27%, an adhesive strength of 10.18 KPa, and a toughness of 5.03 MJ / m -3 , conductivity is 2.41 × 10 -4 S / cm.

[0049] Example 6 (1) Preparation of monolayer MXene: First, 2 g of lithium fluoride was dissolved in 30 mL of 9 mol / L hydrochloric acid solution. The mixture was placed in a polytetrafluoroethylene mold and stirred at 400 rpm for 30 min at room temperature. Then, 2 g of Ti3AlC2 was added and stirred at 35 °C and 400 rpm for 24 h. The stirred solution was placed in a 50 mL centrifuge tube and centrifuged at 4500 rpm for 10 min. The precipitate was collected after the first three centrifugations. The mixture was then centrifuged at 3500 rpm for 10 min until the pH reached ≥ 5. The precipitate was then collected. Subsequently, deionized water was added, ultrasonically crushed for 1 h, and centrifuged at 3500 rpm for 10 min. The supernatant was collected and frozen, then freeze-dried. After 72 h, the mixture was completely dried.

[0050] (2) Preparation of nanocellulose-based composite hydrogel: 1 mL of CNC solution was mixed with 4 mL of deionized water, followed by the addition of 2 mL of MXene and 3 mL of deionized water and stirring uniformly. 1.5 mg of TA was added and the pH was adjusted to 8.1-8.5 with Tris buffer. The mixture was stirred at 700 rpm for 5 hours. After the reaction was complete, N2 was introduced into the solution for 1 minute to remove gases from the solution. 1.8 g of AAm, 0.069% MBA (relative to AAm), 0.35% APS (relative to AAm), and 20 μL of TMEDA were added and stirred at 700 rpm for 10 minutes. The mixture was then poured into a polytetrafluoroethylene mold and heated in a 60°C oven for 20 minutes.

[0051] The highly conductive hydrogel prepared in this example can achieve a stretching strain of 2361.66%, an adhesive strength of 11.11 KPa, and a toughness of 5.39 MJ / m -3 , conductivity is 2.51 × 10 -4 S / cm.

[0052] Comparative Example 1 Preparation of polyacrylamide hydrogel: 10 mL of deionized water was placed in a glass bottle, and N2 was introduced into the solution for 1 minute to remove gas from the solution. 1.8 g of AAm, 0.069% MBA (relative to AAm), 0.35% APS (relative to AAm), and 20 μL of TMEDA were added and stirred at 700 rpm for 10 minutes. The mixed solution was then poured into a polytetrafluoroethylene mold and heated in a 60°C oven for 20 minutes.

[0053] The hydrogel prepared in this comparative example could achieve a stretching strain rate of 584.07%, with an adhesive strength of 8.91 KPa and a toughness of 0.80 MJ / m -3 However, the electrical conductivity is 2.1×10 -7 It's only S / cm.

[0054] Comparative Example 2 Preparation of nanocellulose-based composite hydrogel: 1 mL of CNC solution was mixed with 9 mL of deionized water, and 1.8 g of AAm, 0.069% MBA (relative to AAm), 0.35% APS (relative to AAm), and 20 μL of TMEDA were added. The mixture was stirred at 700 rpm for 10 min, added to a polytetrafluoroethylene mold, and then heated in a 60 °C oven for 20 min.

[0055] The hydrogel prepared in this comparative example could achieve a stretching strain of 1755.41%, an adhesive strength of 6.08 KPa, and a toughness of 5.34 MJ / m -3 However, the electrical conductivity is 2.08×10 -6 It's only S / cm.

[0056] Comparative Example 3 Preparation of nanocellulose-based composite hydrogel: 1 mL of CNC solution was mixed with 9 mL of deionized water, then 1.5 mg of TA was added. The pH was adjusted to 8.1-8.5 with Tris buffer and the mixture was stirred at 700 rpm for 5 h. After the reaction was completed, N2 was introduced into the solution for 1 min to remove the gas in the solution. 1.8 g of AAm, 0.069% MBA (relative to AAm), 0.35% APS (relative to AAm), and 20 μL of TMEDA were added and stirred at 700 rpm for 10 min. The mixture was then poured into a polytetrafluoroethylene mold and heated in a 60°C oven for 20 min.

[0057] The hydrogel prepared in this comparative example could achieve a stretching strain of 1649.01%, with an adhesive strength of 6.07 KPa and a toughness of 1.61 MJ / m -3 However, the electrical conductivity is only 2.03×10 -6 S / cm.

[0058] [Table 1]

[0059] [Table 2]

[0060] As can be seen from Table 2, the addition of TA@CNC and Mxene in Examples 1 to 6 resulted in superior extensibility, adhesion, toughness, and electrical conductivity compared to the comparative examples. Furthermore, Figure 1 shows that the addition of TA@CNC and Mxene improved the mechanical properties of the hydrogel, particularly its tensile properties. Therefore, the method for preparing composite hydrogels based on TA@CNC in the present invention is certainly effective. This demonstrates that the method for preparing composite hydrogels provided in the present invention improves the multifunctional properties of single-network hydrogels, resulting in composite hydrogels with excellent mechanical performance, toughness, and electrical conductivity.

[0061] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for producing a nanocellulose-based multifunctional conductive composite hydrogel, comprising: Add tannic acid to the cellulose nanocrystal suspension and react to obtain surface-modified cellulose nanocrystals with tannic acid; A method for producing a nanocellulose-based multifunctional conductive composite hydrogel, comprising the steps of: uniformly mixing monolayer MXene, the cellulose nanocrystals surface-modified with tannic acid, and an acrylamide monomer; and carrying out a polymerization reaction in the presence of a crosslinker, an initiator, and an accelerator to obtain the nanocellulose-based multifunctional conductive composite hydrogel.

2. The method for producing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 1, characterized in that the mass ratio of the tannic acid to the cellulose nanocrystals is 1:4 to 1:

6.

3. The method for producing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 1, characterized in that the reaction conditions between the tannic acid and the cellulose nanocrystal suspension are a pH value of 8.1 to 8.5, a reaction time of 5 to 6 hours, and a reaction temperature of room temperature.

4. The method for producing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 1, characterized in that the monolayer Mxene is a monolayer Mxene solution, and the concentration of the monolayer MXene solution is 0.2-0.5%.

5. The method for producing a multifunctional conductive composite hydrogel based on nanocellulose according to claim 1 or 4, characterized in that the monolayer MXene is a monolayer Mxene nanosheet obtained by acid erosion separation.

6. The method for preparing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 1 or 2, characterized in that the concentration of the cellulose nanocrystal suspension is 0.5 wt%.

7. The method for producing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 1, characterized in that the polymerization reaction is carried out under conditions of 50 to 60°C for 10 to 20 minutes.

8. The method for preparing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 1, characterized in that the crosslinking agent is N,N' methylenebisacrylamide.

9. The method for producing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 8, wherein the mass fraction of the N,N' methylenebisacrylamide relative to the acrylamide monomer is 0.069%.

10. The method for preparing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 1, characterized in that the initiator is ammonium persulfate.

11. The method for preparing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 10, characterized in that the mass fraction of the ammonium persulfate relative to the acrylamide monomer is 0.35%.

12. The method for preparing a nanocellulose-based multifunctional conductive composite hydrogel according to claim 1, wherein the accelerator is N,N,N',N'-tetramethylethylenediamine.

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