High-strength and high-toughness polyelectrolyte conductive elastomer as well as preparation method and application thereof

Abstract

The invention relates to the technical field of high-molecular polymer materials, in particular to a high-strength and high-toughness polyelectrolyte conductive elastomer as well as a preparation method and application thereof. The method comprises the following steps: mixing 3-acrylamide-N, N, N-trimethylpropane-1-ammonium bis (trifluoromethylsulfonyl) amide, a cross-linking agent and a photoinitiator to obtain a precursor solution, and carrying out an ultraviolet irradiation reaction to obtain a polyelectrolyte conductive elastomer; and then putting into water for swelling process and deswelling process to obtain the high-strength and high-toughness polyelectrolyte conductive elastomer. The method is simple to operate and mild in reaction condition, the obtained high-strength and high-toughness polyelectrolyte conductive elastomer does not contain liquid components, cations are fixed on a polymer chain, anions are adsorbed around the cations under the action of charges, so that the problem of leakage does not exist, and the microstructure of the elastomer contains a glassy hard phase and a high-elastic soft phase, so that the high-strength and high-toughness polyelectrolyte conductive elastomer is prepared. The composite material has excellent mechanical properties of high strength and high toughness, and also has ionic conductivity and good self-healing ability.

Description

Technical Field

[0001] The invention relates to the technical field of high molecular polymer materials, and in particular to a high-strength and high-toughness polyelectrolyte conductive elastomer and a preparation method and application thereof. Background Art

[0002] The past decade has witnessed the emergence of stretchable iontronics, a class of stretchable devices that work through the hybridization of ions and electrons. Such devices can be applied to artificial muscles, skin, axons, ion-electron optical devices, artificial eels, ion-electron thermometry, ion-electron neural interfaces, etc. Among them, stretchable ion conductors are the key components of stretchable iontronics.

[0003] Stretchable ion conductors are mainly divided into ionic hydrogels, ionic gels and ionic conductive elastomers. As a biocompatible polymer network, ionic hydrogels have long been used for electrophysiological measurements. However, the rapid evaporation of water in ionic hydrogels under natural environmental conditions causes the conductivity and mechanical properties of hydrogel-based devices to decrease, and the electrodes will be corroded if they are in contact with the hydrogel for a long time. Therefore, limited by the characteristics of the hydrogel device material itself, the hydrogel cannot be exposed to the natural environment for a long time. Ionic gels based on ionic liquids have attracted widespread attention due to their non-volatility, excellent thermal stability and ionic conductivity. However, one problem faced by ionic liquid gels is that when ionic liquids are subjected to loads (such as extrusion), ionic liquids will inevitably leak. In 2018, Professor Ding Shujiang's team at Xi'an Jiaotong University reported a strategy for preparing ionic conductive elastomers by dissolving salts in polymers. The material has good stretchability, transparency and ionic conductivity. At the same time, in air, high temperature or high pressure, ionic conductive elastomers show very high stability, good adhesion, and no corrosion to metal electrodes, and there is no ionic liquid leakage problem because there is no solvent inside the material. Based on the above advantages, ion-conductive elastomers were considered to be ideal materials for engineering ionic devices at the time. However, the ions in ion-conductive elastomers are freely mobile ions, and their free ions may penetrate into the dielectric layer, causing short circuits and device failure. In 2020, the team of Professor Ryan C. Hayward of the University of Massachusetts and the team of Professor Zhigang Suo of Harvard University prepared polyelectrolyte conductive elastomers, which are a type of ion conductor that does not contain solvents, and at the same time at least one type of ion (cation or anion) is fixed on the polymer network, so there is no problem of solvent or ion leakage. However, the existing polyelectrolyte conductive elastomers generally have poor mechanical properties, especially low modulus, low strength and low toughness, which seriously limit their application potential. Therefore, with the development of soft ion conductor devices, there is an urgent need to study a polyelectrolyte conductive elastomer that is leak-free and has excellent mechanical properties. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a high-strength and high-toughness polyelectrolyte conductive elastomer and a preparation method and application thereof, aiming to solve the problem that the existing polyelectrolyte conductive elastomer cannot have both zero leakage and excellent mechanical properties.

[0005] The technical solution of the present invention is as follows:

[0006] The first aspect of the present invention provides a method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer, which comprises:

[0007] Step S1, mixing 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide, a crosslinking agent and a photoinitiator to obtain a precursor solution, and reacting the mixture under ultraviolet light to obtain a polyelectrolyte conductive elastomer;

[0008] Step S2, placing the polyelectrolyte conductive elastomer in water for a swelling process, and then performing a deswelling process to obtain the high-strength and high-toughness polyelectrolyte conductive elastomer.

[0009] Optionally, the crosslinking agent is 1,6-hexanediol diacrylate, and the photoinitiator is photoinitiator 1173.

[0010] Optionally, the molar amount of the cross-linking agent accounts for 0.01 mol % to 1 mol % of the molar amount of the 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide.

[0011] Optionally, the molar amount of the photoinitiator accounts for 0.01 mol % to 1 mol % of the molar amount of the 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide.

[0012] Optionally, the 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide is prepared by reacting (3-acrylamidepropyl)trimethylammonium chloride and lithium bistrifluoromethanesulfonyl imide.

[0013] Optionally, the wavelength of the ultraviolet light is 320nm to 400nm, and the illumination time is 1h to 24h.

[0014] Optionally, the step S1 specifically includes:

[0015] adding a crosslinking agent and a photoinitiator to 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide to obtain a precursor solution;

[0016] The precursor solution is injected into a glass mold separated by a polytetrafluoroethylene gasket, and a polyelectrolyte conductive elastomer is obtained by ultraviolet light reaction.

[0017] Optionally, the step S2 specifically includes:

[0018] The polyelectrolyte conductive elastomer is placed in water at 60°C to 80°C for 4h to 72h for swelling process, and then placed at 60°C to 100°C for 12h to 72h for deswelling process to obtain the high-strength and high-toughness polyelectrolyte conductive elastomer.

[0019] The second aspect of the present invention provides a high-strength and high-toughness polyelectrolyte conductive elastomer, which is prepared by the preparation method of the present invention.

[0020] The third aspect of the present invention provides an application of the high-strength and high-toughness polyelectrolyte conductive elastomer described in the present invention in a stretchable device.

[0021] Beneficial effects: The present invention provides a method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer, wherein 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide is used as a polymer monomer, the method is simple to operate, and the reaction conditions are mild. The prepared high-strength and high-toughness polyelectrolyte conductive elastomer does not contain liquid components, cations are fixed on polymer chains, and anions are adsorbed around cations due to the action of charges, so there is no leakage problem, and the microstructure of the high-strength and high-toughness polyelectrolyte conductive elastomer contains a glassy hard phase and a highly elastic soft phase, so that it has excellent mechanical properties of high strength and high toughness, and also has ionic conductivity and good self-healing ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 For the polymer monomer AT 1 H-NMR spectrum.

[0023] Figure 2 Schematic diagram of the preparation process of high-strength and high-toughness polyelectrolyte conductive elastomer PAT.

[0024] Figure 3 This is a transparency test data chart of PAT with a crosslinking density of 0.1 mol% at different relative humidities.

[0025] Figure 4 Figure a shows the tensile stress-strain curves of PAT with three different crosslinking densities at a relative humidity of 58%. Figure 4 Figure b shows the tensile stress-strain curve of PAT with a cross-linking density of 0.1 mol% under different humidity conditions.

[0026] Figure 5 Ashby plots between Young's modulus and tensile strength of PAT with a crosslink density of 0.1 mol% and reported ion conductive elastomers 1-8 at different relative humidities.

[0027] Figure 6 Stress-strain curves for fracture toughness tests of notched and unnotched PAT with a crosslink density of 0.1 mol% at different relative humidities.

[0028] Figure 7 Figure a is the Nyquist plot of PAT with a cross-linking density of 0.1 mol% at different relative humidity, where the inset shows the circuit model used to fit the data. Figure 7 Figure b in the figure is C EDL And the conductivity curves changing with relative humidity.

[0029] Figure 8 The high strength and toughness of PAT with a crosslinking density of 0.1 mol% under relative humidity of 58% and 32% respectively.

[0030] Fig. 9 Figure a shows the tensile curves of the initial sample and the cut PAT sample at 1h, 1.5h, and 2h of self-healing. Fig. 9 Figure b is a schematic diagram of the PAT sample after self-healing for 2 hours after being cut and uniaxially stretched to 4 times and 7 times its original length. DETAILED DESCRIPTION

[0031] The present invention provides a high-strength and high-toughness polyelectrolyte conductive elastomer and a preparation method and application thereof. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] The embodiment of the present invention provides a method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer, which comprises:

[0033] Step S1, mixing 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide, a crosslinking agent and a photoinitiator to obtain a precursor solution, and reacting the mixture under ultraviolet light to obtain a polyelectrolyte conductive elastomer;

[0034] Step S2, placing the polyelectrolyte conductive elastomer in water for a swelling process, and then performing a deswelling process to obtain the high-strength and high-toughness polyelectrolyte conductive elastomer.

[0035] In the embodiment of the present invention, 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide (AT) is used as a polymer monomer, and the AT monomer has a dynamic hydrogen bond structure, so that the interaction between polymer chains in the final polymer is enhanced and has self-healing ability. In the embodiment of the present invention, the AT monomer, a crosslinking agent, and a photoinitiator are first mixed under ultraviolet light conditions to react to obtain a polyelectrolyte conductive elastomer, and then the polyelectrolyte conductive elastomer is phase-separated to produce a soft phase and a hard phase structure by a swelling process in water, and then the water is removed by a deswelling process. In this state, the hard phase structure in the material can still be retained, and the material is in a glassy state with ultrahigh strength, thereby preparing a high-strength and high-toughness polyelectrolyte conductive elastomer. The method is simple to operate and has mild reaction conditions. The prepared high-strength and high-toughness polyelectrolyte conductive elastomer does not contain liquid components, cations are fixed on polymer chains, and anions are adsorbed around cations due to the action of charges, so there is no leakage problem. In addition, the microstructure of the high-strength and high-toughness polyelectrolyte conductive elastomer contains a glassy hard phase and a highly elastic soft phase, so that it has excellent mechanical properties of high strength and high toughness, and also has ionic conductivity and good self-healing ability.

[0036] In some embodiments, the crosslinking agent is 1,6-hexanediol diacrylate, and the photoinitiator is photoinitiator 1173.

[0037] In some embodiments, the molar amount of the cross-linking agent accounts for 0.01 mol% to 1 mol% (e.g., 0.01 mol%, 0.05 mol%, 0.1 mol%, 0.5 mol%, 1 mol%) of the molar amount of 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide.

[0038] In some embodiments, the molar amount of the photoinitiator accounts for 0.01 mol% to 1 mol% (for example, 0.01 mol%, 0.05 mol%, 0.1 mol%, 0.5 mol%, 1 mol%) of the molar amount of the 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide; preferably 0.01 mol%.

[0039] In some embodiments, the 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide is prepared by reacting (3-acrylamidepropyl)trimethylammonium chloride and lithium bis(trifluoromethanesulfonyl imide). Preferably, the molar ratio of (3-acrylamidepropyl)trimethylammonium chloride to lithium bis(trifluoromethanesulfonyl imide) is 1:1.

[0040] In some embodiments, the wavelength of the ultraviolet light is 320nm to 400nm (for example, 320nm, 350nm, 360nm, 365nm, 370nm, 380nm, 390nm, 400nm), and the illumination time is 1h to 24h (for example, 1h, 5h, 10h, 12h, 15h, 20h, 24h). Preferably, the wavelength of the ultraviolet light is 365nm, and the illumination time is 5h.

[0041] In some implementations, the step S1 specifically includes:

[0042] adding a crosslinking agent and a photoinitiator to 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide to obtain a precursor solution;

[0043] The precursor solution is injected into a glass mold separated by a polytetrafluoroethylene gasket, and a polyelectrolyte conductive elastomer is obtained by ultraviolet light reaction.

[0044] In some implementations, step S2 specifically includes:

[0045] The polyelectrolyte conductive elastomer is placed in water at 60°C to 80°C (preferably 65°C) for 4h to 72h (preferably 6h) for swelling process, and then placed at 60°C to 100°C (preferably 65°C) for 12h to 72h (preferably 12h) for deswelling process to obtain the high-strength and high-toughness polyelectrolyte conductive elastomer.

[0046] An embodiment of the present invention provides a high-strength and high-toughness polyelectrolyte conductive elastomer, wherein the elastomer is prepared by the preparation method described in any of the above embodiments.

[0047] The high-strength and high-toughness polyelectrolyte conductive elastomer provided in the embodiment of the present invention does not contain liquid components, cations are fixed on the polymer chains, and anions are adsorbed around the cations due to the action of charges, and its glass transition temperature is ~21.2°C. Therefore, the microstructure of the high-strength and high-toughness polyelectrolyte conductive elastomer contains a glassy hard phase and a highly elastic soft phase, so that it has excellent mechanical properties of high modulus (45MPa~85MPa), high tensile strength (3.8MPa~7.8MPa) and high elongation (378%~650%) at a relative humidity of 58%, and also has ionic conductivity and good self-healing ability.

[0048] An embodiment of the present invention provides an application of the high-strength and high-toughness polyelectrolyte conductive elastomer described in the aforementioned embodiment in a stretchable device.

[0049] The present invention will be further described below by means of specific examples.

[0050] Example 1

[0051] This embodiment provides a method for preparing a polymer monomer 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide (AT), and the reaction formula is:

[0052]

[0053] , specifically including the following steps:

[0054] 1 mol of (3-acrylamidopropyl)trimethylammonium chloride (APTAC) with a water content of 25% and 1 mol of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) are uniformly mixed and reacted to obtain a polymer monomer AT that is insoluble in water and LiCl that is easily soluble in water. After the reaction is completed, the upper water layer is first removed by a liquid separation method, and then anhydrous sodium sulfate is added to absorb the remaining water, and then filtered to obtain a viscous transparent product polymer monomer AT. The polymer monomer AT 1 H-NMR Figure 1 shown.

[0055] Example 2

[0056] This embodiment provides a method for preparing three high-strength and high-toughness polyelectrolyte conductive elastomers (PAT) with different crosslinking densities (1 mol%, 0.1 mol% and 0.01 mol%), which specifically includes the following steps:

[0057] Take three equal amounts of 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide (AT) prepared in Example 1, add 1,6-hexanediol diacrylate (HDDA) with molar densities of 1 mol%, 0.1 mol% and 0.01 mol% as a crosslinking agent, and then add 0.01 mol% of photoinitiator (1173) to dissolve in the mixed liquid to form a transparent precursor solution. Then, the precursor solution is injected into a glass mold separated by a 0.5 mm thick polytetrafluoroethylene gasket, and irradiated under ultraviolet light at 365 mm for 5 h to obtain three polyelectrolyte conductive elastomer samples with different crosslinking densities (1 mol%, 0.1 mol% and 0.01 mol%). Then, the samples with three different crosslinking densities were swollen in deionized water and placed in a 65°C oven for 6 hours, and then taken out and placed in a 65°C oven for 12 hours to obtain three high-strength and high-toughness polyelectrolyte conductive elastomers PAT with different crosslinking densities (1 mol%, 0.1 mol% and 0.01 mol%). The preparation process is shown in the figure below. Figure 2 shown.

[0058] Example 3

[0059] This example explores the transparency of the high-strength and high-toughness polyelectrolyte conductive elastomer PAT with a crosslinking density of 0.1 mol% prepared in Example 2, as follows:

[0060] The transmittance of the PAT prepared in Example 2 with a cross-linking density of 0.1 mol% was tested on a UV-visible spectrophotometer (METASH UV-8000). The thickness of the test sample was 0.5 mm, and the relative humidity (referring to the water vapor content in the air) tested was 32%, 52%, 58%, 64% and 76%, respectively.

[0061] Figure 3 This is a transparency test data graph of PAT with a cross-linking density of 0.1 mol% at different relative humidities, wherein the coordinate graph represents the relationship between wavelength and transmittance at different relative humidities, and the inset represents the transmittance at different relative humidities. According to the graph, the transmittance of the PAT sample at different relative humidities reaches 90%, indicating that its transparency is very good.

[0062] Example 4

[0063] This example explores the tensile properties of the high-strength and high-toughness polyelectrolyte conductive elastomer PAT with crosslinking densities of 1 mol%, 0.1 mol% and 0.01 mol% prepared in Example 2, as follows:

[0064] The PAT prepared in Example 2 with crosslinking densities of 1 mol%, 0.1 mol% and 0.01 mol% were cut into dumbbell shapes using a punching machine according to JIS-K6251-7 standard, and the uniaxial tensile properties of the three PATs with different crosslinking densities and the uniaxial tensile properties under different relative humidities were tested using a material testing machine, where the loading speed was 30 mm / min.

[0065] Figure 4 Figure a shows the tensile stress-strain curves of PAT with three different crosslinking densities at a relative humidity of 58%. Figure 4 Figure b shows the tensile stress-strain curve of PAT with a cross-linking density of 0.1 mol% under different humidity conditions. From this figure, it can be seen that the three PAT samples with different cross-linking densities simultaneously exhibit high Young's modulus (>10MPa), high tensile strength (>2MPa) and high elongation (>300%).

[0066] At the same time, the Young's modulus and tensile strength of PAT with a crosslinking density of 0.1 mol% at different humidity levels were compared with those of other reported ion-conductive elastomers. Figure 5: It is an Ashby plot between Young's modulus and tensile strength of PAT with a cross-linking density of 0.1 mol% and reported ion conductive elastomers 1-8 at different relative humidity, wherein 1 in the figure represents the ion conductive elastomer reported in the article (A mechanically robust and versatile liquid-free ionic conductive elastomer, DOI: 10.1002 / adma.202006111), 2 in the figure represents the ion conductive elastomer reported in the article (Fabrication of tough and stretchable hybrid double-network elastomers usingionic dissociation of polyelectrolyte in nonaqueous media, DOI: 10.1021 / acs.chemmater.9b00871), and 3 in the figure represents the article (Transparent, highly stretchable, rehealable, sensing, and fully recyclable ionic conductors fabricated by one-step polymerization based on a small biological molecule,DOI:10.1002 / adfm.201902467), 4 in the figure represents the ion conductive elastomer reported in the article (Highly transparent, underwater self-healing, and ionic conductive elastomer based on multivalent ion-dipole interactions,DOI:10.1021 / acs.chemmater.0c00096), and 5 in the figure represents the article (All-solid-state self-healing ionicconductors enabled by ion-dipole interactions within fluorinated poly(ionicliquid)copolymers,DOI:10.1021 / acsami.1c12880), 6 in the figure represents the ion conductive elastomer reported in the article (Phase-locked constructing dynamic supramolecular ionic conductive elastomers with superior toughness, autonomous self-healing and recyclability, DOI: 10.1038 / s41467-022-32517-4), 7 in the figure represents the ion conductive elastomer reported in the article (A waterproof ion-conducting fluorinated elastomer with 6000%stretchability, superior ionic conductivity, and harsh environment tolerance, DOI: 10.1002 / adfm.202112293), and 8 in the figure represents the article (Multifunctional liquid-free ionic conductive elastomer fabricated by liquid metal inducedpolymerization,DOI:10.1002 / adfm.202101957). According to the figure, the high-strength and high-toughness polyelectrolyte conductive elastomer PAT of the present invention exhibits a variation of Young's modulus and tensile strength across two orders of magnitude under different relative humidity, and has a higher Young's modulus at the same tensile strength compared with other ion conductive elastomers.

[0067] Example 5

[0068] This example explores the fracture toughness of the high-strength and high-toughness polyelectrolyte conductive elastomer PAT with a crosslinking density of 0.1 mol% prepared in Example 2, as follows:

[0069] The PAT with a crosslinking density of 0.1 mol% prepared in Example 2 was cut into dumbbell shapes using a punching machine according to the JIS-K6251-7 standard. The parallel section size was 5 mm × 20 mm. It was divided into notched samples and non-notched samples. The prefabricated notch size of the notched sample was 1 mm. The uniaxial tensile properties of the notched and non-notched samples were tested at different relative humidities using a material testing machine, where the loading speed was 30 mm / min. Substituting into the formula , where Γ represents the fracture toughness, W represents the strain energy density of the unnotched sample, and λ crepresents the elongation at break of the notched sample, c represents the length of the prefabricated notch, and the corresponding fracture toughness is calculated.

[0070] Figure 6 The stress-strain curves of the fracture toughness test of notched and unnotched PAT with a crosslink density of 0.1 mol% at different relative humidities. According to the figure, the fracture toughness of PAT can reach up to 41.5 kJ / m 2 .

[0071] Example 6

[0072] This example explores the conductive properties of the high-strength and high-toughness polyelectrolyte conductive elastomer PAT with a crosslinking density of 0.1 mol% prepared in Example 2, as follows:

[0073] The PAT with a cross-linking density of 0.1 mol% prepared in Example 2 was cut into rectangular samples of 10 mm×15 mm×0.42 mm, and the resistance of the samples at different relative humidity was tested using a digital multimeter KEYSIGHT 34465A. The conductivity of the PAT was calculated using the formula σ=L / AR, where σ represents the conductivity, L represents the length of the sample, A represents the cross-sectional area of ​​the sample, and R represents the resistance of the measured sample.

[0074] Figure 7 Figure a is the Nyquist plot of PAT with a cross-linking density of 0.1 mol% at different relative humidity, where the inset shows the circuit model used to fit the data. Figure 7 Figure b in the figure is C EDL The conductivity curve of PAT is 10 -5 S / m, has conductive properties.

[0075] Example 7

[0076] This example explores the high strength and high toughness of the high strength and high toughness polyelectrolyte conductive elastomer PAT with a crosslinking density of 0.1 mol% prepared in Example 2, as follows:

[0077] The PAT prepared in Example 2 with a crosslinking density of 0.1 mol% was cut into a sample of 7.5 mm × 52 mm × 1 mm with a mass of 0.56 g. Figure 8 As shown in Figure a, it can pull up a weight of 1 kg in an environment with a relative humidity of 58%, which is 1785 times the weight of the sample itself.

[0078] The PAT prepared in Example 2 with a crosslinking density of 0.1 mol% was cut into a sample of 14 mm × 52 mm × 1 mm with a mass of 1.0 g. Figure 8As shown in Figure b, it can pull up a weight of 1 kg in an environment with a relative humidity of 32%, which is 1000 times the weight of the sample itself.

[0079] The above experiments show that the PAT prepared by the present invention has high-strength and high-toughness mechanical properties, that is, has good load-bearing capacity.

[0080] Example 8

[0081] This example explores the self-healing ability of the high-strength and high-toughness polyelectrolyte conductive elastomer PAT with a crosslinking density of 0.1 mol% prepared in Example 2, as follows:

[0082] The PAT sample with a cross-linking density of 0.1 mol% prepared in Example 2 was cut open and placed in an environment with a temperature of 46° C. and a relative humidity of 80% for self-healing for 2 hours to test its self-healing ability.

[0083] Fig. 9 Figure a shows the tensile curves of the initial sample and the cut PAT sample at 1h, 1.5h, and 2h of self-healing. Fig. 9 Figure b is a schematic diagram of the PAT sample after self-healing for 2 hours after being cut and uniaxially stretched to 4 times and 7 times its original length. According to the figure, the tensile properties of the sample after self-healing are basically consistent with the tensile properties of the initial sample, indicating that the PAT sample can self-heal 100%.

[0084] In summary, the preparation method of the high-strength and high-toughness polyelectrolyte conductive elastomer provided by the present invention is simple to operate and has mild reaction conditions. The prepared high-strength and high-toughness polyelectrolyte conductive elastomer has good transparency, tensile properties, fracture toughness and excellent mechanical properties of high strength and toughness, and also has ionic conductivity and good self-healing ability, so it can be well used in stretchable devices.

[0085] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer, characterized in that: include: Step S1, mixing 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide, a crosslinking agent and a photoinitiator to obtain a precursor solution, and reacting the mixture under ultraviolet light to obtain a polyelectrolyte conductive elastomer; Step S2, placing the polyelectrolyte conductive elastomer in water for a swelling process, and then performing a deswelling process to obtain the high-strength and high-toughness polyelectrolyte conductive elastomer.

2. The method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer according to claim 1, characterized in that: The crosslinking agent is 1,6-hexanediol diacrylate, and the photoinitiator is photoinitiator 1173.

3. The method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer according to claim 1, characterized in that: The molar amount of the cross-linking agent accounts for 0.01 mol % to 1 mol % of the molar amount of the 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide.

4. The method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer according to claim 1, characterized in that: The molar amount of the photoinitiator accounts for 0.01 mol % to 1 mol % of the molar amount of the 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide.

5. The method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer according to claim 1, characterized in that: The 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide is prepared by reacting (3-acrylamidepropyl)trimethylammonium chloride and lithium bis(trifluoromethanesulfonyl imide).

6. The method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer according to claim 1, characterized in that: The wavelength of the ultraviolet light is 320nm-400nm, and the light exposure time is 1h-24h.

7. The method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer according to claim 1, characterized in that: The step S1 specifically includes: adding a crosslinking agent and a photoinitiator to 3-acrylamide-N,N,N-trimethylpropane-1-ammonium bis(trifluoromethylsulfonyl)amide to obtain a precursor solution; The precursor solution is injected into a glass mold separated by a polytetrafluoroethylene gasket, and a polyelectrolyte conductive elastomer is obtained by ultraviolet light reaction.

8. The method for preparing a high-strength and high-toughness polyelectrolyte conductive elastomer according to claim 1, characterized in that: The step S2 specifically includes: The polyelectrolyte conductive elastomer is placed in water at 60°C to 80°C for 4h to 72h for swelling process, and then placed at 60°C to 100°C for 12h to 72h for deswelling process to obtain the high-strength and high-toughness polyelectrolyte conductive elastomer.

9. A high-strength and high-toughness polyelectrolyte conductive elastomer, characterized in that: The preparation method is described in any one of claims 1 to 8.

10. Use of the high-strength and high-toughness polyelectrolyte conductive elastomer according to claim 9 in a stretchable device.

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