Preparation Method of a Super-Stretchable and Self-Healing Polysiloxane Flexible Electrode
By surface modification and cross-linking of carbon nanotubes, the prepared ultra-stretchable self-healing polysiloxane flexible electrode solves the problems of reduced conductivity and self-healing, achieving efficient self-healing and maintaining conductive properties.
Patent Information
- Application Number
- CN202510656685.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2045-05-21
AI Technical Summary
The existing flexible electrodes have reduced conductivity under large strains and cannot be repaired after damage. The conductive filler has poor compatibility with the polymer matrix, resulting in a decrease in the conductivity of composite materials.
By surface modification of the carbon nanotubes by catecholamine and isocyanate dimer, dynamic urea and imine bonds are formed, the compatibility of the conductive filler and polymer matrix is improved, and the self-healing performance of aminopolysiloxane is used to prepare ultra-stretchable self-healing polysiloxane flexible electrodes.
The prepared flexible electrode can quickly heal at room temperature after mechanical damage or electric breakdown, maintain high conductivity, and have ultra-stretchability, and has self-healing efficiency of mechanical properties up to more than 97%.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of flexible electrodes, and in particular to a method for preparing an ultra-stretchable self-healing polysiloxane flexible electrode. Background Art
[0002] The widespread application of flexible electrodes in fields such as electronic skin, medical monitoring devices, and soft robotics has significantly driven the rapid development of flexible electronics. However, currently used flexible electrodes (such as silver nanowires and PEDOT:PSS) suffer from reduced conductivity under high strain and an inability to self-repair after damage, severely limiting their widespread use. While stretchable flexible electrodes can be obtained by filling polymer matrices with conductive fillers (such as carbon nanotubes and graphene), the poor compatibility between the conductive fillers and the polymer matrix and the tendency of the fillers to agglomerate reduce the conductivity of the composite material, for which no corresponding solution exists in the existing technology. Summary of the Invention
[0003] The purpose of the present invention is to provide a method for preparing an ultra-stretchable self-healing polysiloxane flexible electrode. The method has a simple operation process and mild reaction conditions. The conductive filler in the prepared composite material has excellent compatibility with the polymer matrix, and the flexible electrode has ultra-stretchability. After mechanical damage or electrical breakdown, it can quickly self-heal at room temperature and still maintain high conductivity.
[0004] The purpose of the present invention is achieved through the following technical solutions:
[0005] A method for preparing an ultra-stretchable self-healing polysiloxane flexible electrode, the method comprising:
[0006] Step 1: Surface modification of carbon nanotubes (CNTs) is performed using catecholamines to obtain carbon nanotubes modified with catecholamines, which are denoted as CNT-PA.
[0007] Step 2: Using isocyanate dimer to graft-modify the surface of CNT-PA to obtain an isocyanate dimer-modified conductive filler, which is recorded as CNT-PA-DI;
[0008] Step 3, dissolving aminopolysiloxane and CNT-PA-DI in tetrahydrofuran (THF) respectively, and mixing to obtain an aminopolysiloxane suspension in which CNT-PA-DI is uniformly dispersed;
[0009] Step 4, dissolving the aldehyde crosslinking agent and the isocyanate dimer in tetrahydrofuran (THF) respectively, and mixing them to obtain a mixed solution of the aldehyde crosslinking agent and the isocyanate dimer;
[0010] Step 5: Add the amino polysiloxane suspension with uniformly dispersed CNT-PA-DI obtained in Step 3 into the mixed solution obtained in Step 4 for reaction, and then pour the solution obtained after the reaction into a polytetrafluoroethylene mold, and volatilize the solvent at room temperature to obtain a super stretchable and self-healing polysiloxane flexible electrode.
[0011] As can be seen from the technical solutions provided by the present invention above, the operation process of the above method is simple and the reaction conditions are mild. The conductive filler and the polymer matrix in the prepared composite material have excellent compatibility, and the flexible electrode has super stretchability and can quickly self-heal at room temperature after being mechanically damaged or electrically broken down, and still maintains a high conductivity. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0013] Figure 1 It is a schematic flow chart of the preparation method of the super stretchable and self-healing polysiloxane flexible electrode provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments, which does not constitute a limitation to the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
[0015] As Figure 1 shown is a schematic flow chart of the preparation method of the super stretchable and self-healing polysiloxane flexible electrode provided by the embodiment of the present invention. The method includes:
[0016] Step 1: Modify the surface of carbon nanotubes CNT with catecholamine to obtain carbon nanotubes modified with catecholamine, denoted as CNT-PA;
[0017] In this step, specifically, 2-8 g of CNT is dispersed in 1000 mL of deionized water to form a uniform solution;
[0018] Add 2-4 g of catecholamine to the solution, place it in a magnetic stirrer, set the stirring speed to 300-600 r / min, stir at room temperature for 4-10 h, then perform centrifugal separation, wash with acetone, and dry at 40-60 °C for 12-24 h to obtain CNT modified and modified with catecholamine, denoted as CNT-PA.
[0019] In a specific implementation, the catecholamine is one or two of 2-(3,4-dihydroxyphenyl)ethylamine and 1-(3,4-dihydroxyphenyl)-2-aminoethanol.
[0020] Step 2: Perform surface graft modification on CNT-PA with isocyanate dimer to obtain a conductive filler modified with isocyanate dimer, denoted as CNT-PA-DI;
[0021] In this step, specifically, disperse 2-8 g of CNT-PA in 1000 mL of tetrahydrofuran (THF) to form a uniform solution;
[0022] Add 0.2-1.0 g of isocyanate dimer to the solution, place it in a magnetic stirrer, set the stirring speed to 300-600 r / min, and stir in a 40-60 °C water bath for 4-10 h;
[0023] Subsequently, perform centrifugal separation, wash with acetone, and dry at 40-60 °C for 12-24 h to obtain CNT-PA modified and modified with isocyanate dimer, denoted as CNT-PA-DI.
[0024] Step 3: Dissolve aminopolysiloxane and CNT-PA-DI in tetrahydrofuran (THF) respectively, and after mixing, obtain a suspension of aminopolysiloxane with uniform dispersion of CNT-PA-DI;
[0025] In this step, specifically, dissolve 10-20 g of aminopolysiloxane in 100 mL of THF, and ultrasonically disperse it at 50 kHz for 30-60 min to form a uniformly dispersed aminopolysiloxane solution;
[0026] Dissolve 2-8 g of CNT-PA-DI in 500 mL of tetrahydrofuran (THF), and ultrasonically disperse it at 50 kHz for 30-60 min to form a CNT-PA-DI suspension;
[0027] Mix the aminopolysiloxane solution and the CNT-PA-DI suspension, and stir at room temperature for 30-60 min to obtain a suspension of aminopolysiloxane with uniform dispersion of CNT-PA-DI.
[0028] In a specific implementation, the amino polysiloxane is one or both of a polysiloxane with amino groups at both ends or a polysiloxane with amino groups in the side chain, and the number-average molecular weight is 2000-10000.
[0029] Step 4: Dissolve the aldehyde group crosslinking agent and the isocyanate dimer in tetrahydrofuran (THF) respectively, and after mixing, obtain a mixed solution of the aldehyde group crosslinking agent and the isocyanate dimer.
[0030] In this step, specifically, 0.05-0.2 g of the aldehyde group crosslinking agent is dissolved in 20 mL of tetrahydrofuran (THF), and ultrasonic dispersion is carried out at 50 kHz for 30-60 min to form a uniformly dispersed aldehyde group crosslinking agent solution.
[0031] Dissolve 0.05-0.2 g of the isocyanate dimer in 20 mL of THF, and ultrasonic disperse at 50 kHz for 30-60 min to form a uniformly dispersed isocyanate dimer solution.
[0032] Mix the aldehyde group crosslinking agent solution and the isocyanate dimer solution, and stir at room temperature for 30-60 min to obtain a mixed solution of the aldehyde group crosslinking agent and the isocyanate dimer.
[0033] In a specific implementation, the aldehyde group crosslinking agent is one or more of terephthalaldehyde, isophthalaldehyde, and mellitic aldehyde;
[0034] The isocyanate dimer is one or more of hexamethylene diisocyanate dimer, isophorone diisocyanate dimer, and dicyclohexylmethane diisocyanate.
[0035] Step 5: Add the uniformly dispersed amino polysiloxane suspension of CNT-PA-DI obtained in Step 3 into the mixed solution obtained in Step 4 for reaction, and then pour the solution obtained after the reaction into a polytetrafluoroethylene mold, and volatilize the solvent at room temperature to obtain a super stretchable self-healing polysiloxane flexible electrode.
[0036] In this step, specifically, add the amino polysiloxane suspension in Step 3 into the mixed solution of the aldehyde group crosslinking agent and the isocyanate dimer in Step 4, stir and react at 40-60 °C for 1-3 h, and then pour the solution obtained after the reaction into a polytetrafluoroethylene mold, and volatilize the solvent at room temperature to obtain a super stretchable self-healing polysiloxane flexible electrode.
[0037] According to the preparation process of this method, catecholamine forms a uniform coating on the surface of CNT, providing abundant phenolic hydroxyl active sites. Further, the isocyanate group of the isocyanate dimer reacts with the phenolic hydroxyl group to graft flexible polyurethane segments on the surface of CNT. The modified CNT reacts with the amino group of the polysiloxane matrix through the isocyanate group on its surface to form dynamic urea bonds, avoiding the slip at the filler-matrix interface and solving the problems of poor dispersion and easy agglomeration of CNT in the polymer matrix. The amino group in the aminopolysiloxane reacts with the aldehyde group in the aldehyde crosslinking agent to generate dynamic imine bonds. At the same time, the isocyanate dimer introduces urea bonds into the molecular chain to form reversible hydrogen bonds, endowing the polysiloxane with excellent self-healing performance at room temperature.
[0038] It should be noted that the content not described in detail in the embodiments of the present invention belongs to the prior art well-known to those skilled in the art.
[0039] The following describes the preparation process, mechanical properties, and electrical conductivity of the composite material of the present invention with specific implementation cases:
[0040] Implementation Case 1
[0041] (1) Disperse 4 g of CNT in 1000 mL of deionized water to form Solution 1.
[0042] (2) Add 2 g of 2-(3,4-dihydroxyphenyl)ethylamine to Solution 1, place it in a magnetic stirrer, set the speed to 600 r / min, and stir at room temperature for 6 h to obtain functionalized CNT and generate Solution 2.
[0043] (3) Centrifuge Solution 2, wash it with acetone, and then dry it at 60 °C for 24 h to obtain CNT modified with 2-(3,4-dihydroxyphenyl)ethylamine, denoted as CNT-PA, for standby.
[0044] (4) Disperse 4 g of CNT-PA in 100 mL of THF to form Solution 3.
[0045] (5) Add 0.8 g of hexamethylene diisocyanate dimer to Solution 3, place it in a magnetic stirrer, set the stirring speed to 600 r / min, and stir in a 60 °C water bath for 8 h to graft isocyanate groups on the surface of CNT-PA to obtain the treated mixed Solution 4.
[0046] (6) Centrifuge the mixed Solution 4, wash it with acetone, and then dry it at 60 °C for 24 h to obtain CNT-PA modified with hexamethylene diisocyanate dimer, denoted as CNT-PA-DI, for standby.
[0047] (7) Dissolve 20 g of amino-terminated polysiloxane in 100 mL of THF, and ultrasonically disperse it for 30 min at 50 kHz to form a uniform solution 5;
[0048] (8) Dissolve 4 g of CNT-PA-DI in 60 mL of THF, and ultrasonically disperse it for 30 min at 50 kHz to form a uniform suspension 6;
[0049] (9) Mix solution 5 and suspension 6, and stir for 30 min at room temperature to form solution 7;
[0050] (10) Dissolve 0.15 g of benzene-1,3,5-tricarbaldehyde in 10 mL of THF, and ultrasonically disperse it for 30 min at 50 kHz to form a uniformly dispersed solution 8;
[0051] (11) Dissolve 0.15 g of hexamethylene diisocyanate dimer in 10 mL of THF, and ultrasonically disperse it for 30 min at 50 kHz to form a uniformly dispersed solution 9;
[0052] (12) Mix solution 8 and solution 9, and stir for 30 min at room temperature to form solution 10;
[0053] (13) Add solution 10 to solution 7, stir at 60 °C for 3 h, pour it into a polytetrafluoroethylene mold, and volatilize the solvent at room temperature to obtain a super-stretchable self-healing polysiloxane flexible electrode.
[0054] Perform mechanical property tests on the flexible electrode prepared in step (13), and set the tensile rate to 100 mm / min. The mechanical property self-healing test is to cut the middle of the test specimen along the direction perpendicular to the tensile axis, then closely contact the two fracture surfaces together, repair at room temperature for 30 min, and perform mechanical property tests again. The tensile test results are shown in Table 1 below.
[0055] Perform conductivity tests on the flexible electrode prepared in step (13). The specific test method is as follows: Use a four-probe resistivity tester, with the probes arranged linearly, the distance between adjacent probes being 1.0 ± 0.1 mm, and the probe material being tungsten carbide or gold-plated tungsten needles. The conductivity test after self-healing is to perform conductivity tests again after mechanical damage and repair at room temperature for 30 min. The conductivity test results are shown in Table 1 below.
[0056] Example 2: The preparation method is the same as that of Example 1, except that the addition amount of benzene-1,3,5-tricarbaldehyde in step (10) is 0.05 g. Perform mechanical property tests and conductivity tests on the prepared flexible electrode before and after self-healing, and the test results are shown in Table 1.
[0057] Example 3: The preparation method is the same as that of Example 1, except that the addition amount of phloroglucinol in step (10) is 0.2 g. The mechanical properties and conductivity of the prepared flexible electrode before and after self-healing are tested, and the test results are shown in Table 1.
[0058] Example 4: The preparation method is the same as that of Example 1, except that the addition amount of CNT-PA-DI in step (8) is 2 g. The mechanical properties and conductivity of the prepared flexible electrode before and after self-healing are tested, and the test results are shown in Table 1.
[0059] Example 5: The preparation method is the same as that of Example 1, except that the addition amount of CNT-PA-DI in step (8) is 8 g. The mechanical properties and conductivity of the prepared flexible electrode before and after self-healing are tested, and the test results are shown in Table 1.
[0060] Example 6: The preparation method is the same as that of Example 1, except that the addition amount of hexamethylene diisocyanate dimer in step (11) is 0.05 g. The mechanical properties and conductivity of the prepared flexible electrode before and after self-healing are tested, and the test results are shown in Table 1.
[0061] Example 7: The preparation method is the same as that of Example 1, except that the addition amount of hexamethylene diisocyanate dimer in step (11) is 0.2 g. The mechanical properties and conductivity of the prepared flexible electrode before and after self-healing are tested, and the test results are shown in Table 1.
[0062] Example 8: The preparation method is the same as that of Example 1, except that the isocyanate dimer added in step (2) is isophorone diisocyanate dimer. The mechanical properties and electro-driven performance of the prepared flexible electrode before and after self-healing are tested, and the test results are shown in Table 1.
[0063] Example 9: The preparation method is the same as that of Example 1, except that the aldehyde cross-linking agent added in step (10) is 0.15 g of terephthalaldehyde. The mechanical properties and electro-driven performance of the prepared flexible electrode before and after self-healing are tested, and the test results are shown in Table 1.
[0064] Example 10: The preparation method is the same as that of Example 1, except that the catecholamine added in step (2) is 2 g of 1-(3,4-dihydroxyphenyl)-2-aminoethanol. The mechanical properties and conductivity of the prepared flexible electrode before and after self-healing are tested, and the test results are shown in Table 1.
[0065] Example 11: The preparation method is the same as that of Example 1, except that the amino polysiloxane added in step (7) is 20 g of side-chain amino polysiloxane. The mechanical properties and conductivity of the prepared flexible electrode before and after self-healing are tested, and the test results are shown in Table 1.
[0066] Comparative Case 12: The preparation method is the same as that of Example 1, except that unmodified CNTs are added. The mechanical properties and conductivity of the prepared flexible electrode before and after self-healing are tested, and the comparison results are shown in Table 1.
[0067] Comparative Case 13: The preparation method is the same as that of Example 1, except that no CNTs are added. The mechanical properties and conductivity of the prepared pure silicone rubber before and after self-healing are tested, and the comparison results are shown in Table 1.
[0068] Table 1 Performance Comparison of Composites Prepared in Examples and Comparative Cases with Comparative Cases
[0069] Label Tensile strength (original) kPa Tensile strength (after healing) kPa Elongation at break (original) % Elongation at break (after healing) % Conductivity (original) S / cm Conductivity (after healing) S / cm Case 1 47.82 46.95 1265 1245 97.25 88.50 Case 2 38.65 37.88 1430 1401 95.45 86.31 Case 3 60.45 59.24 1054 1033 91.78 83.52 Case 4 35.85 35.13 1490 1460 86.15 77.53 Case 5 67.63 66.28 1010 990 100.34 90.93 Case 6 43.84 42.96 1395 1367 90.48 82.34 Case 7 52.93 51.87 1132 1109 91.26 83.05 Case 8 52.35 51.76 1162 1139 94.37 85.88 Case 9 40.19 39.76 1401 1373 90.74 82.57 Case 10 45.82 45.02 1321 1295 95.35 85.04 Case 11 50.73 48.97 1188 1171 95.31 86.74 Comparative Case 12 48.32 30.51 1055 580 20.51 10.31 Comparative Case 13 20.91 19.64 1632 1503 0 0
[0070] As can be seen from the data in Table 1 above: When the CNTs modified with catecholamine and isocyanate dimer are filled to 20 wt%, the elongation at break of the flexible electrode reaches 1265%, the self-healing efficiency of the mechanical properties reaches 98%, the conductivity can reach 97.25 S / cm, and the self-healing efficiency of the conductivity reaches 90%. The self-healing polysiloxane flexible electrode prepared by this method has both super stretchable performance and high conductivity.
[0071] In summary, the super stretchable self-healing polysiloxane flexible electrode prepared by the method described in the embodiments of the present invention can complete self-healing quickly at room temperature without any external auxiliary conditions, and the healing efficiency is as high as over 97% within 30 minutes; this flexible electrode has excellent conductivity and elongation at break, and the preparation process is simple, the reaction conditions are mild, and it is efficient and time-saving.
[0072] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. The information disclosed in the background art part of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art.
Claims
1. A preparation method of a super-stretchable and self-healing polysiloxane flexible electrode, characterized in that The method includes: Step 1: Surface-modify carbon nanotubes CNT with catecholamine to obtain catecholamine-modified carbon nanotubes, denoted as CNT-PA; Step 2: Conduct surface grafting modification on CNT-PA with isocyanate dimer to obtain conductive fillers modified with isocyanate dimer, denoted as CNT-PA-DI; Step 3: Dissolve amino polysiloxane and CNT-PA-DI in tetrahydrofuran THF respectively, and after mixing, obtain an amino polysiloxane suspension with uniformly dispersed CNT-PA-DI; Step 4: Dissolve aldehyde group crosslinker and isocyanate dimer in tetrahydrofuran THF respectively, and after mixing, obtain a mixed solution of aldehyde group crosslinker and isocyanate dimer blend; Step 5: Add the amino polysiloxane suspension with uniformly dispersed CNT-PA-DI obtained in Step 3 into the mixed solution obtained in Step 4 for reaction, and then pour the solution obtained after the reaction into a polytetrafluoroethylene mold, and volatilize the solvent at room temperature to obtain a super stretchable self-healing polysiloxane flexible electrode.
2. The preparation method of the super-stretchable and self-healing polysiloxane flexible electrode according to claim 1, wherein, The specific process of Step 1 is as follows: Disperse 2 - 8 g of CNT in 1000 mL of deionized water to form a uniform solution; Add 2 - 4 g of catecholamine into the solution, place it in a magnetic stirrer, set the stirring speed to 300 - 600 r / min, stir at room temperature for 4 - 10 h, then carry out centrifugal separation, wash with acetone, and dry at 40 - 60 °C for 12 - 24 h to obtain catecholamine-modified CNT, denoted as CNT-PA.
3. The preparation method of the super-stretchable and self-healing polysiloxane flexible electrode according to claim 1, wherein The specific process of Step 2 is as follows: Disperse 2 - 8 g of CNT-PA in 1000 mL of tetrahydrofuran THF to form a uniform solution; Add 0.2 - 1.0 g of isocyanate dimer into the solution, place it in a magnetic stirrer, set the stirring speed to 300 - 600 r / min, and stir in a 40 - 60 °C water bath for 4 - 10 h; Then carry out centrifugal separation, wash with acetone, and dry at 40 - 60 °C for 12 - 24 h to obtain isocyanate dimer-modified CNT-PA, denoted as CNT-PA-DI.
4. The preparation method of the super-stretchable and self-healing polysiloxane flexible electrode according to claim 1, wherein, The specific process of Step 3 is as follows: Dissolve 10 - 20 g of amino polysiloxane in 100 mL of THF, and ultrasonically disperse it at 50 kHz for 30 - 60 min to form a uniformly dispersed amino polysiloxane solution; Dissolve 2 - 8 g of CNT-PA-DI in 500 mL of tetrahydrofuran THF, and ultrasonically disperse it at 50 kHz for 30 - 60 min to form a CNT-PA-DI suspension; Mix the amino polysiloxane solution and the CNT-PA-DI suspension, and stir at room temperature for 30 - 60 min to obtain an amino polysiloxane suspension with uniformly dispersed CNT-PA-DI.
5. The preparation method of the super-stretchable and self-healing polysiloxane flexible electrode according to claim 1, characterized in that, The specific process of Step 4 is as follows: Dissolve 0.05 - 0.2 g of aldehyde group crosslinker in 20 mL of tetrahydrofuran THF, and ultrasonically disperse it at 50 kHz for 30 - 60 min to form a uniformly dispersed aldehyde group crosslinker solution; Dissolve 0.05 - 0.2 g of isocyanate dimer in 20 mL of THF, and ultrasonically disperse it at 50 kHz for 30 - 60 min to form a uniformly dispersed isocyanate dimer solution; Mix the aldehyde group crosslinker solution and the isocyanate dimer solution, and stir at room temperature for 30 - 60 min to obtain a mixed solution of the aldehyde group crosslinker and the isocyanate dimer.
6. The preparation method of the super-stretchable and self-healing polysiloxane flexible electrode according to claim 1, characterized in that, The process of step 5 is specifically as follows: Add the amino polysiloxane suspension in step 3 to the mixed solution of the aldehyde group crosslinker and the isocyanate dimer in step 4, stir and react at 40 - 60 °C for 1 - 3 h, then pour the solution obtained after the reaction into a polytetrafluoroethylene mold, and volatilize the solvent at room temperature to obtain a super stretchable self-healing polysiloxane flexible electrode.
7. The preparation method of the super-stretchable and self-healing polysiloxane flexible electrode according to claim 1, wherein, In step 3, the amino polysiloxane is one or both of a polysiloxane with amino groups at both ends or a polysiloxane with amino groups in the side chain, and the number average molecular weight is 2000 - 10000.
8. The preparation method of the super-stretchable and self-healing polysiloxane flexible electrode according to claim 1, wherein, In step 4, the aldehyde group crosslinker is one or more of terephthalaldehyde, isophthalaldehyde and phloroglucinol; The isocyanate dimer is one or more of hexamethylene diisocyanate dimer, isophorone diisocyanate dimer and dicyclohexylmethane diisocyanate.
9. The preparation method of the super-stretchable and self-healing polysiloxane flexible electrode according to claim 1, wherein, In step 1, the catecholamine is one or both of 2-(3,4-dihydroxyphenyl)ethylamine and 1-(3,4-dihydroxyphenyl)-2-aminoethanol.
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