CN112708014B - Recyclable self-repairing transparent conductive elastomer and preparation method and application thereof - Google Patents
Recyclable self-repairing transparent conductive elastomer and preparation method and application thereof Download PDFInfo
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- CN112708014B CN112708014B CN202011536554.5A CN202011536554A CN112708014B CN 112708014 B CN112708014 B CN 112708014B CN 202011536554 A CN202011536554 A CN 202011536554A CN 112708014 B CN112708014 B CN 112708014B
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
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- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/04—Polymerisation in solution
- C08F2/06—Organic solvent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
- G01N27/126—Composition of the body, e.g. the composition of its sensitive layer comprising organic polymers
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Abstract
The invention discloses a recyclable and self-repairable transparent conductive elastomer, and a preparation method and application thereof. The recyclable self-repairing transparent conductive elastomer has high transparency, adjustable mechanical property, good conductivity and excellent self-repairing capability, and can realize water circulation and hot-pressing remodeling at the same time. The recyclable self-repairing transparent conductive elastomer can be used in sensing systems for identifying different liquids and monitoring different human activities, and the practical application of the recyclable self-repairing transparent conductive elastomer is realized.
Description
Technical Field
The invention relates to the technical field of elastomer materials, in particular to a recyclable self-repairable transparent conductive elastomer and a preparation method and application thereof.
Background
In order to meet the increasing advanced requirements of green flexible electronic devices, conductive elastomers are also expected to integrate a variety of functional properties. For example: bauhinia et al report a stretchable, fully degradable semiconductor for use in transient electronic devices; leeshi and its collaborators have developed a series of water-processable, stretchable, self-healing, thermally stable, transparent ionic semiconductors for actuators and sensors. These studies have greatly promoted the development of green electronic devices. This group also reported a series of transparent, self-healing conductive elastomers. While researchers have done to their best to provide elastomers with more functional properties, it remains a challenge to prepare multifunctional (e.g., transparent, conductive, self-healing, recyclable, etc.) conductive elastomers that meet the green electronic requirements.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art and provides a preparation method of a recyclable self-repairing transparent conductive elastomer, which is simple, quick, green and environment-friendly.
Another object of the present invention is to provide a recyclable self-repairable transparent conductive elastomer, which has high transparency, adjustable mechanical properties, good electrical conductivity and excellent self-repairing capability, and can realize water circulation and hot-pressing remodeling simultaneously.
The invention also aims to provide application of the recyclable self-repairable transparent conductive elastomer.
The technical scheme adopted by the invention is as follows:
a preparation method of a recyclable self-repairable transparent conductive elastomer comprises the following steps:
(1) mixing choline chloride, acrylamide and glycerol according to a molar ratio of 1: (1-2): (1-1.5), heating the mixture at 60-90 ℃ until a uniform clear transparent solution is formed;
(2) adding a cross-linking agent and a photoinitiator into the clear transparent solution prepared in the step (1), and stirring uniformly at room temperature to obtain a prepolymer solution of a mixed liquid, wherein the dosage of the cross-linking agent and the photoinitiator is 0.1-5% of the molar mass of acrylamide;
(3) and (3) polymerizing the prepolymer solution prepared in the step (2) through ultraviolet irradiation to obtain the recyclable self-repairable transparent conductive elastomer.
The invention obtains the recyclable self-repairing transparent conductive elastomer with excellent performance by accurately designing and selecting a hydrogen bond acceptor (choline chloride), a hydrogen bond donor (acrylamide) and a 'diluent' (glycerol) of a proper polymerizable eutectic solvent and curing by ultraviolet light, wherein the glycerol is used as the 'diluent', the crosslinking density of the hydrogen bond acceptor and the hydrogen bond donor is weakened, the interaction of non-covalent bonds in a polymer network is increased, and the prepared conductive elastomer can be easily dissolved and regenerated in water. The prepared conductive elastomer has high transparency, adjustable mechanical property, good conductivity and excellent self-repairing capability (after multiple cycles and repair, the prepared conductive elastomer can keep the optical property basically unchanged, and the mechanical property and the electrical property are only slightly reduced), can realize water circulation and hot-pressing remodeling at the same time, is beneficial to prolonging the service life of a flexible electronic device and reducing electronic wastes.
Preferably, the cross-linking agent is one or more of tripropylene glycol diacrylate, polyethylene glycol diacrylate, dipropylene glycol diacrylate, 1, 6-hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate phthalate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate.
Preferably, the photoinitiator is one or more of benzoin and derivatives photoinitiator, benzil photoinitiator, alkylbenzene photoinitiator and acyl phosphorus oxide photoinitiator. More specifically, the photoinitiator may be one or more of 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO), 1173 (2-hydroxy-2-methyl-1-phenylpropanone), 184 (1-hydroxycyclohexylphenylketone), 2959 (2-hydroxy-4- (2-hydroxyethoxy) -2-methylpropiophenone).
The recyclable self-repairable transparent conductive elastomer prepared by the preparation method.
Preferably, the self-repairing capability of the recyclable self-repairable transparent conductive elastomer is that the repairing efficiency is 80% -90% after the transparent conductive elastomer is dissolved in water for three times.
Preferably, the recyclable self-healing transparent conductive elastomer has an optical transmittance of >92% in the visible range.
Preferably, the stress of the recyclable self-repairing transparent conductive elastomer is 0.05-3.56 MPa, and the strain is 810-1410%.
Preferably, the conductivity of the recyclable self-repairing transparent conductive elastomer is 0.1-0.55S/m.
The recyclable and self-repairable transparent conductive elastomer prepared by the preparation method is applied to a multifunctional induction system. The recyclable and self-repairable transparent conductive elastomer prepared by the invention can be used in sensing systems for identifying different liquids and monitoring different human activities, and the practical application of the recyclable and self-repairable transparent conductive elastomer is realized. Therefore, the work of the present invention will contribute to the development of recyclable multifunctional electronic devices, and has a significant promoting significance for the realization of sustainable development.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a new strategy for preparing a recyclable conductive elastomer based on a polymerizable eutectic solvent, and a non-polymerizable micromolecule solvent glycerol is introduced to swell a polymer network, so that other molecules (such as water molecules) can enter conveniently, and the recyclable and highly self-repairing transparent conductive elastomer is prepared;
(2) after the recyclable self-repairing transparent conductive elastomer prepared by the invention is subjected to multiple circulations and repairs, the prepared conductive elastomer can keep the optical performance basically unchanged, and the mechanical performance and the electrical performance are slightly reduced;
(3) the recyclable and self-repairable transparent conductive elastomer prepared by the invention can be recycled in water, and various personalized patterns can be formed again;
(4) the recyclable and self-repairable transparent conductive elastomer prepared by the invention can realize water circulation and hot-pressing remodeling at the same time, is beneficial to prolonging the service life of a flexible electronic device and reducing electronic wastes;
(5) the recyclable and self-repairable transparent conductive elastomer prepared by the invention can be used for a multifunctional induction system, and is used for identifying different liquid drops and inducing different human body motions.
Drawings
FIG. 1 is an infrared spectrum of PDES, choline chloride, acrylamide and glycerol.
Fig. 2 is a graph of optical, mechanical, and electrical performance testing of a recyclable self-repairable transparent conductive elastomer.
Fig. 3 is a diagram of a dissolution regeneration cycle experimental process of a recyclable self-repairable transparent conductive elastomer.
FIG. 4 is a graph of performance test results of recycled self-repairable transparent conductive elastomers after recycling.
FIG. 5 is a diagram of the application of a recyclable self-healing transparent conductive elastomer to a sensing system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail with reference to specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The conductive polymerizable eutectic solvent with the self-repairing function is researched before the subject group, the cross-linking agent can be one or more of polyethylene glycol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, 1, 6-hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate phthalate, trimethylolpropane triacrylate and pentaerythritol tetraacrylate, and the photoinitiator can be one or more of benzoin and derivative photoinitiators, benzil photoinitiators, alkylbenzene photoinitiators and acylphosphorus oxide photoinitiators. For those skilled in the art, based on the experimental results of one of the cross-linking agents and the photo-initiator applied to the preparation of the high mechanical strength transparent conductive elastomer, it can be speculated that the use of the other related cross-linking agent and photo-initiator necessarily has similar performance, so the patent does not complete the experiments on all the photo-initiators and cross-linking agents.
The following examples are all common commercial products as starting materials unless otherwise specified.
Choline chloride (ChCl), acrylamide (AAm) were dried under vacuum at 60 ℃ for 2 hours before the experiment.
Example 1 to example 3.
A recyclable self-repairable transparent conductive elastomer (RSHTCE) is prepared by the following steps:
(1) preparation of PDES of the ChCl-AAm-GY type: choline chloride, acrylamide, glycerol were mixed in a molar ratio of 1:1:1 (example 1), 1:1.5:1 (example 2) and 1:2:1 (example 3), the mixture was heated in a closed flask at 65 ℃ until a homogeneous clear transparent solution formed, and the prepared PDES of the ChCl-AAm-GY type was stored in a vacuum desiccator with silica gel for further use.
(2) Preparation of prepolymer solution: adding a crosslinking agent polyethylene glycol diacrylate (PEG (200) DA) and a photoinitiator 2959 into the clear transparent solution prepared in the step (1), uniformly stirring at room temperature to obtain a prepolymer solution of a mixed liquid, wherein the addition amount of the crosslinking agent and the initiator is 0.1% of the molar mass of the acrylamide monomer;
(3) photopolymerization of PDES of the ChCl-AAm-GY type: placing the prepolymer solution prepared in the step (2) into a vessel or a mould, and then placing the prepolymer solution in a UV light source (the light intensity is 20mW cm)-2) The polymerization can be completed after the irradiation for 2 minutes, and the recyclable self-repairing transparent conductive elastomer RSHTCE is obtained.
Example 4
A recyclable and self-repairable transparent conductive elastomer is prepared by the same process as in example 1, except that the molar ratio of choline chloride, acrylamide and glycerol in example 4 is 1:1: 1.5.
Example 5
A recyclable self-healing transparent conductive elastomer was prepared substantially in the same manner as in example 1 except that the polyethylene glycol diacrylate in example 2 was replaced with an equimolar amount of tripropylene glycol diacrylate.
Example 6
A recyclable and self-repairable transparent conductive elastomer is prepared by the same process as in example 2, except that the amount of the polyethylene glycol diacrylate used in example 2 is 5% by mole of the acrylamide monomer.
Comparative example 1
A transparent conductive elastomer was prepared in substantially the same manner as in example 3 except that in comparative example 1, choline chloride, acrylamide and maleic acid were mixed in a molar ratio of 1:2: 1.
Performance testing
(1) And (3) infrared testing: the method adopts a VERTEX 70 Fourier transform infrared spectrometer for testing, and the wave number scanning range is 500-4000cm-1Setting resolution to 4cm-1. The environmental conditions tested were room temperature 25 deg.C and humidity 30% -35%. Choline chloride (ChCl), acrylamide (AAm), Glycerol (GY) were also tested by infrared testing in comparison to PDES.
(2) And (3) ultraviolet testing: the optical transmittance of RSHTCE was measured by an ultraviolet-visible spectrophotometer (S3100). The test conditions are that the room temperature is 25 ℃ and the humidity is 30-35%.
(3) And (3) testing mechanical properties: cutting RSHTCE into 2 × 5 × 0.1cm3The mechanical properties of RSHTCE were tested using an INSTRON 5565 model tensile compression Material tester. The test conditions are that the room temperature is 25 ℃ and the humidity is 30-35%.
(4) And (3) testing electrical properties: and connecting the copper sheet with a lead, and testing by adopting a PARSTAT 2273 type electrochemical workstation to obtain the electrical performance of the RSHTCE. The current of the electrochemical workstation is 200mA, and the frequency range is 0.01-105 Hz. The test conditions are that the room temperature is 25 ℃ and the humidity is 30-35%.
(5) Metallographic microscope: the RSHTCE samples before and after the repair are placed under an OLYMPUS BX63 type metallographic microscope, and an optical photo of the self-repair process is taken.
(6) Resistance-time signal measurement: in the experiment, a Keithley DMM7510 digital source meter is used for measuring the change of an electrical signal of the strain sensor, and a 2-wire resistance mode is selected for measurement. The test conditions are that the room temperature is 25 ℃ and the humidity is 30-35%.
(7) Optical picture shooting: an optical photograph of RSHTCE was taken using a Nikon Digital Sight DS-Fil camera.
To confirm that the PDES prepared in this step (1) is formed only by the interaction of hydrogen bonds, we performed infrared spectroscopy tests on the CHCl-AAm-GY type PDES, choline chloride (ChCl), acrylamide (AAm), and Glycerol (GY) using Fourier transform infrared spectroscopy (FT-IR), as shown in FIG. 1. As can be seen from FIG. 1, 3185cm-1Here, the amino group in acrylamide is still present in PDES and is unchanged. Thus, in the absence of an initiator, step (1) does not initiate polymerization of the monomer during the heating stage, and the components form a clear and transparent liquid under the interaction of hydrogen bonds.
The recyclable self-healing transparent conductive elastomers prepared in examples 1 to 6 were subjected to optical, mechanical and electrical property tests, and the test results are shown in table 1. The appearance is as shown in fig. 2(a), and the high transparent thin film (thickness of 1mm) of RSHTCE has excellent transparency and flexibility, and is almost as transparent as glass. The mechanical properties were measured and the test chart is shown in FIG. 2c, and the procedure is to test the mechanical properties of RSHTCE at a tensile speed of 50 mm/min. The optical transmittance and the stress strain test chart of examples 1 to 3 are shown in fig. 2(b) and 2(d), respectively (RSHTCE-1 represents example 1, RSHTCE-1.5 represents example 2, and RSHTCE-2 represents example 3). As can be seen from FIG. 2(d), as the molar ratio of AAm increases from 1 to 2, the strain at break of RSHTCE decreases from 1410% to 810%, and the corresponding tensile strength increases from 0.05MPa to 3.28 MPa. This indicates that as the molar ratio of AAm increases, the crosslinked polymeric network becomes more and more compact and the RSHTCE becomes more and more rigid, resulting in more brittle behavior. The application of the RSHTCE prepared in examples 1 to 6 of the present invention in series with the LED small bulb can make the LED small bulb continuously and stably light up, and keep lighting even during stretching (see fig. 2(e)), which indicates that the RSHTCE has excellent electrical properties. Since RSHTCE is an ionic conductor, we used the AC impedance method to test its conductivity, wherein the AC impedance test chart of examples 1 to 3 is shown in FIG. 2 (f). As shown in FIG. 2(f), the conductivity of RSHTCE decreased from 0.4S/m to 0.1S/m as the molar ratio of AAm increased. This is probably due to the fact that the polymer network increases in crosslink density with increasing AAm, hindering the movement of ions, and causing the conductivity of the RSHTCE to decrease.
TABLE 1
| Test items | Optical transmittance (%) | Stress (MPa) | Strain (%) | Conductivity (S/m) |
| Example 1 | 92.91 | 0.05 | 1410 | 0.4 |
| Example 2 | 92.42 | 0.25 | 960 | 0.2 |
| Example 3 | 92.08 | 3.28 | 810 | 0.1 |
| Example 4 | 92.01 | 0.07 | 1020 | 0.55 |
| Example 5 | 92.07 | 0.15 | 980 | 0.38 |
| Example 6 | 92.35 | 3.56 | 835 | 0.15 |
The recyclable self-repairing transparent conductive elastomer prepared by the invention also has excellent self-repairing performance, the conductive elastomers prepared in the embodiments 1 to 6 of the invention are spliced together and bonded together again after being cut off, and a microscopic picture under a microscope can further prove that a cutting trace disappears, which shows that the recyclable self-repairing transparent conductive elastomer has excellent self-repairing performance. The restored RSHTCE-1.5 can lift a weight of 500 g. In addition, the RSHTCE prepared by the method can be reshaped by simple hot pressing, fragments of the RSHTCE-1.5 can be clamped in a glass plate and heated at 80 ℃ for 4 hours, and various personalized patterns such as butterflies and the like can be easily reshaped, and the removability and the processability of the RSHTCE are further proved.
The invention also performs a recycling performance test of the recyclable self-repairing transparent conductive elastomer. One thin film of RSHTCE (3 i) prepared in example 2 was gradually dissolved (3 ii-3 iv) within 3 days after immersion in water. After dissolution was complete, the mixture was poured into a teflon disc (3v) and evaporated at 50 ℃ for 24h to give a transparent RSHTCE film (3 vi). It is noteworthy that the performance of the regenerated RSHTCE film hardly changed any significant after recycling many times. The recovered RSHTCE was subjected to test characterization, and the test results are shown in FIG. 4, wherein after 5 times of cyclic recovery, the optical performance is hardly changed, the strain is reduced to 805, and the conductivity is slightly reduced to 0.25S/m. The results show that the recycled RSHTCE shows little change in optical properties, with a slight decrease in mechanical and electrical properties, which may be associated with a small amount of loss during cycling. An aqueous solution experiment was also attempted on the conductive elastomer prepared in comparative example 1, but the conductive elastomer prepared in comparative example 1 was insoluble in water and could not be subjected to the water dissolution cycle test.
To demonstrate the practical application of RSHTCE in a multifunctional sensing system, the inventors have established a RSHTCE-based sensing system, as shown in FIG. 5. As shown in fig. 5(a) and 5(b), a sensing system based on RSHTCE is established, and since different liquids have different polarities, and have different wettabilities to choline chloride, when the liquids are dropped on the surface of an elastomer, different response signals are generated, and the response is carried out through an electric signal. Due to the high density of dynamic and reversible hydrogen bonds (consisting of hydroxyl and amino groups), RSHTCE has very sensitive sensing properties for liquids of different polarity and different deformation. As shown in FIG. 5(c), the liquid deionized Water (Water), Ethanol (Ethanol), Acetone (Acetone) and N-hexane (N-hexane) with different polarities were selected as the liquid to be detected (polarity sequence: deionized Water > Ethanol > Acetone > N-hexane). The resistance changes of the different droplets were monitored in real time using a digital source meter, model Keithley DMM7510, as shown in fig. 4 (d-g). When deionized water or ethanol drops on the induction system, the resistance is reduced; when acetone and n-hexane liquid drops are dripped on the surface of the induction system, the movement of ions is limited, and the resistance is increased. Since RSHTCE is an ionic conductor, the movement of ions in the polymer network plays a decisive role in its electrical conductivity. The wetting action of different polarity liquids on ChCl is also different, which accelerates or limits the movement of ions, and RSHTCE is a different change in resistance in macroscopic appearance. Therefore, the RSHTCE prepared by the invention has great significance in identifying polar/non-polar liquid, and can even help a manipulator to identify different liquids.
In addition, RSHTCE can better distinguish the motion with different amplitudes in the aspect of human motion monitoring. As shown in fig. 5(h-j), the RSHTCE based sensing system can detect real-time electrical signal changes of the insufflation ((h)), the finger bend ((i)), and the arm elbow ((j)). Thus, monitoring of different motion amplitudes can be achieved with a well-designed RSHTCE sensing system, which will provide new insight for the improvement of flexible electronics.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (7)
1. A preparation method of a recyclable self-repairable transparent conductive elastomer is characterized by comprising the following steps:
(1) mixing choline chloride, acrylamide and glycerol according to a molar ratio of 1: (1-2): (1-1.5), heating the mixture at 60-90 ℃ until a uniform clear transparent solution is formed;
(2) adding a cross-linking agent and a photoinitiator into the clear transparent solution prepared in the step (1), and stirring uniformly at room temperature to obtain a prepolymer solution of a mixed liquid, wherein the dosage of the cross-linking agent and the photoinitiator is 0.1-5% of the molar mass of acrylamide;
(3) polymerizing the prepolymer solution prepared in the step (2) through ultraviolet irradiation to obtain a recyclable self-repairable transparent conductive elastomer;
the cross-linking agent is one or more of tripropylene glycol diacrylate, polyethylene glycol diacrylate, dipropylene glycol diacrylate, 1, 6-hexanediol diacrylate and neopentyl glycol diacrylate.
2. The preparation method of claim 1, wherein the photoinitiator is one or more of benzoin and derivatives photoinitiator, benzil photoinitiator, alkylbenzene photoinitiator and acylphosphorus oxide photoinitiator.
3. The recyclable self-repairable transparent conductive elastomer prepared by the preparation method of claim 1 or 2.
4. The recyclable self-healing transparent conductive elastomer of claim 3, wherein the recyclable self-healing transparent conductive elastomer has an optical transmittance >92% in the visible range.
5. The recyclable self-healing transparent conductive elastomer as claimed in claim 3, wherein the recyclable self-healing transparent conductive elastomer has a stress of 0.05-3.56 MPa and a strain of 810-1410%.
6. The recyclable self-healing transparent conductive elastomer as claimed in claim 3, wherein the conductivity of the recyclable self-healing transparent conductive elastomer is 0.1-0.55S/m.
7. The application of the recyclable self-repairable transparent conductive elastomer prepared by the preparation method of any one of claims 3 to 6 in a multifunctional sensing system.
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