A biomass-modified hydrophobic electronic conductive polymer gel material and a preparation method and application thereof

Abstract

The present application belongs to the technical field of gel materials, and relates to a hydrophobic electronic conductive polymer gel material based on biomass modification and a preparation method and application thereof. In terms of mass fraction, raw materials thereof include a hydrophobic deep eutectic liquid biomass material, an acid anhydride modifier, a conjugated monomer, a hydrophobic monomer, a dopant, an oxidizing agent, a buffer solution and a surfactant; the hydrophobic deep eutectic liquid is composed of a hydrophobic hydrogen bond donor and a hydrophobic hydrogen bond acceptor. The three-dimensional hydrophilic network of a traditional gel is changed into a hydrophobic network, an in-situ polymerization method is adopted to construct an electronic conductive network, the electronic conductive polymer is modified by using a biomass material, the 'insoluble and infusible' characteristics of the electronic conductive polymer are effectively improved, and the network is successfully applied to a hydrogel flexible substrate. Not only the limitations of traditional hydrogels in practical application are solved, but also a new material selection is provided for the manufacturing of flexible electronic devices, and the further development and application of flexible electronic technology are expected to be promoted.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gel materials, and particularly relates to a biomass-modified hydrophobic electronic conductive polymer gel material and a preparation method and application thereof. BACKGROUND

[0002] In recent years, the rapid development of flexible electronics has driven the application of flexible strain sensors. These sensors have the characteristics of light weight, flexibility and portability, which have shown great potential in multiple frontier fields. Flexible strain sensors not only have good biocompatibility and conductivity, but also improve the waterproof performance through hydrophobic treatment, so that they can maintain stable working state under various environmental conditions.

[0003] With the continuous progress of technology, this material is expected to play an important role in the development of intelligent materials and technologies in the future. Especially in electronic skin, medical monitoring, human-computer interaction and artificial intelligence. The core competitiveness of these sensors lies in their ability to accurately and sensitively detect and respond to mechanical deformation such as stretching, compression and bending, thereby achieving real-time monitoring of external environmental changes. In order to achieve high-performance strain sensing function, material scientists and engineers are constantly exploring various strategies to optimize the structure and performance of sensors.

[0004] Biomass materials refer to organic substances derived from nature, such as cellulose, chitosan, sodium alginate, etc. These materials have good biocompatibility and biodegradability, and are suitable for use in biomedical and environmental protection fields.

[0005] Building and regulating the conductive network is one of the key steps to improve the performance of strain sensors. The conductive network not only determines the conductivity of the sensor, but also directly affects its sensitivity, response speed and stability. Conductive polymers are a class of organic high molecular materials with conductivity, which are a kind of high molecular polymer with three-dimensional network cross-linked structure inside, can maintain the integrity of its structure in air and water, and have widely adjustable physical and chemical properties. It has high electrical conductivity, good mechanical properties and easy processing characteristics, showing great potential in the field of flexible electronics; however, using water as a solvent alone can cause problems such as freezing at low temperatures and water loss, resulting in material drying and becoming brittle, loss of conductive fillers, poor mechanical properties, and loss of electrical properties.

[0006] One possible solution to these limitations is to replace water with deep eutectic liquids. Currently, some literature uses functionalized hydrophilic deep eutectic liquids as monomers and introduces photoinitiation technology to form gels by polymerization, which improves the problem of poor mechanical properties, but also has problems such as too viscous solvent system difficult to participate in polymerization reaction and low reaction rate. SUMMARY

[0007] The present application aims to provide a biomass-modified hydrophobic electronic conductive polymer gel material and a preparation method thereof, and solves the problem of over-viscous solvent system and low reaction rate when using deep eutectic liquid instead of water as the solvent of the conductive polymer.

[0008] The present application is realized by the following technical solutions:

[0009] A biomass-modified hydrophobic electronic conductive polymer gel material, in terms of mass fraction, comprises the following components:

[0010] 8-10 parts of hydrophobic deep eutectic liquid, 2-4 parts of biomass material, 1-4 parts of anhydride modifier, 2-4 parts of conjugated monomer, 1-3 parts of hydrophobic monomer, 0.08-0.1 parts of dopant, 3-5 parts of oxidant, 20-30 parts of buffer solution, and 20-30 parts of surfactant;

[0011] The hydrophobic deep eutectic liquid is composed of a hydrophobic hydrogen bond donor and a hydrophobic hydrogen bond acceptor in a molar ratio of 1:(2-4).

[0012] Further, the hydrophobic hydrogen bond donor is trioctylmethyl ammonium bromide, n-octyl trimethyl ammonium bromide, tetra-n-octyl ammonium bromide, octadecyl trimethyl ammonium bromide, or bis-octyl dimethyl ammonium chloride.

[0013] The hydrophobic hydrogen bond acceptor is ethyl aconitate, methyl aconimate, dichloronide furanate, or diethyl maleate.

[0014] Further, the biomass material is one or more of heparin, maltodextrin, cassava starch, carboxymethyl chitosan, gelatin, gum arabic, konjac, and hydroxypropyl chitosan.

[0015] Further, the anhydride modifier is angelic anhydride, NA-anhydride, crotonic anhydride, itaconic anhydride, maleic anhydride, or 2,3-dimethyl maleic anhydride.

[0016] Further, the conjugated monomer is 1-(3-sulfopropyl)-2-vinyl pyridine hydroxide inner salt, 3-(2-nitrovinyl) pyridine, 1-vinyl-3-butyl imidazole bromide, or 1-vinyl-3-ethyl imidazole bromide.

[0017] The hydrophobic monomer is isooctyl acrylate, ethyl acrylate, octadecyl methacrylate, or hydroxyethyl acrylate.

[0018] Further, the crosslinking agent is MBA.

[0019] The initiator is ammonium persulfate, potassium persulfate, or BPO.

[0020] Further, the dopant is tannic acid, p-toluene sulfonic acid, sulfamic acid, citric acid, lactic acid or formic acid.

[0021] The oxidizing agent is peracetic acid, perchloric acid, hypochlorous acid, ammonium persulfate, potassium dichromate, hydrogen peroxide, potassium permanganate or iron permanganate.

[0022] Further, the buffer solution is Tris buffer solution, phosphate buffer, sodium phosphate dibasic-sodium dihydrogen phosphate buffer or imidazole-hydrochloride buffer;

[0023] The surfactant is dodecyl dimethyl betaine, carboxylate imidazoline, sodium coconut alcohol sulfate, sodium lauryl sulfate or cocamide propyl betaine.

[0024] The application further discloses a preparation method of the biomass-modified hydrophobic electronic conductive polymer gel material.

[0025] 1) mixing and reacting a hydrophobic hydrogen bond donor and a hydrophobic hydrogen bond acceptor in a molar ratio of 1:(2-4) to obtain a hydrophobic deep eutectic liquid through freeze-drying;

[0026] 2) dissolving 2-4 parts of biomass material in 20-30 parts of a buffer solution, adjusting the pH to 6-8, and then adding 3-5 parts of an anhydride modifier dropwise to react at 0-5 DEG C to obtain a modified biomass material;

[0027] 3) mixing the modified biomass material with 2-4 parts of a conjugated monomer and 0.08-0.1 parts of a dopant, adding 3-5 parts of an oxidizing agent dropwise at a temperature of 0-3 DEG C, and then performing centrifugation, washing, purification and freeze-drying after reaction to obtain a biomass-modified conductive polymer;

[0028] 4) adding 8-10 parts of the deep eutectic liquid to 20-30 parts of a surfactant and ultrasonic dispersing, then adding 1-3 parts of a hydrophobic monomer, 0.08-0.1 parts of a crosslinking agent and 2-4 parts of the biomass-modified conductive polymer prepared in step 3) to the surfactant, passing a protective gas, adding 0.1-0.3 parts of an initiator dropwise, and then reacting at 65-80 DEG C for 30 min to obtain the biomass-modified hydrophobic electronic conductive polymer gel material.

[0029] The application further discloses application of the biomass-modified hydrophobic electronic conductive polymer gel material in preparation of a flexible sensor.

[0030] Compared with the prior art, the application has the following beneficial technical effects:

[0031] The application discloses a biomass-modified hydrophobic electronic conductive polymer gel material, which is prepared from a hydrophobic deep eutectic liquid, biomass material and an anhydride modifier.

[0032] The application changes the three-dimensional hydrophilic network of the traditional gel into a hydrophobic network, constructs the conductive network by in-situ polymerization, and modifies the network by using biomass material to effectively improve the insoluble and infusible characteristics of the conductive polymer, and successfully applies the network to a hydrogel flexible substrate.

[0033] Further, the hydrogen bond acceptor of the hydrophobic deep eutectic liquid is an organic salt skeleton, which can further form a quaternary ammonium salt structure to improve the electrical properties.

[0034] The application provides a preparation method of the biomass-modified hydrophobic electronic conductive polymer gel material, which comprises the following steps: firstly, introducing a hydrophobic deep eutectic liquid to provide a hydrophobic environment for subsequent polymerization reaction, so that each monomer is polymerized in the same phase to improve the reaction rate; secondly, mixing an anhydride modifier with biomass material to introduce a double bond and obtain modified biomass material; thirdly, mixing the modified biomass material, a conjugated monomer, a dopant and an oxidant, polymerizing the conjugated monomer to form a conductive polymer with a large conjugated system, grafting the conductive polymer monomer to the biomass material by using the anhydride modifier, and then performing in-situ interfacial oxidative polymerization to obtain a biomass-modified conductive polymer; and finally, introducing the biomass-modified conductive polymer into a deep eutectic liquid system, grafting the functionalized biomass material to a hydrophobic monomer molecular chain by a free radical polymerization method, and forming a long-range ordered conductive material.

[0035] The present application directly modifies the functional groups (amino, hydroxyl) on the biomass material by anhydride, obtains the modified biomass material; grafts the conductive polymer material on the modified biomass material, and further synthesizes the modified conductive polymer of the biomass material by using the method of in-situ chemical oxidation polymerization. The matrix gel material of free radical polymerization is combined with the modified conductive polymer of the biomass material, and a new type of flexible conductive composite material is created. The material not only retains the soft characteristics of the hydrogel, but also introduces the electrical properties of the conductive medium, so that it shows significant advantages in the development of flexible electronic devices.

[0036] The present application introduces the conductive polymer, that is, can effectively improve the electrical properties and improve the mechanical properties. Secondly, by combining the conductive polymer and the biomass material to form a double network structure, a new type of composite material with unique properties can be created. This structure can provide a larger contact area, thereby having a double regulation effect on the electrical properties and mechanical properties. The product combines the double network structure of the conductive polymer and the biomass material, which not only improves the electrical properties and mechanical properties of the material, but also widens its application in flexible electronics, intelligent packaging, biomedical and other fields. This innovative composite material is expected to become an important part of future intelligent materials and technologies. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The result graph of the mechanical property test of the product prepared for the embodiment of the present application is shown in the following figure.

[0038] Figure 2 The result graph of the conductive property test of the product prepared for the embodiment of the present application is shown in the following figure. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application, that is, the described examples are only a part of the embodiments of the present application, but not all the embodiments.

[0040] The detailed description of the embodiments of the present application provided in the following drawings is not intended to limit the scope of the claimed present application, but only to represent a selected embodiment of the present application. Based on the drawings and examples of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] It is to be understood that the terms "comprising," "including," and other correlative terms are intended to be equivalently open-ended as the terms "consisting" and "consisting essentially of. Thus, unless otherwise noted, the terms "comprising" and "including" when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, and / or components.

[0042] The application discloses a preparation method of a biomass-modified hydrophobic electronic conductive polymer gel material.

[0043] 1) mixing and reacting a hydrophobic hydrogen bond donor and a hydrophobic hydrogen bond acceptor in a molar ratio of 1:2-4, and freeze-drying to obtain a hydrophobic deep eutectic liquid;

[0044] 2) dissolving 2-4 parts of biomass material in 20-30 parts of a buffer solution, adjusting the pH to 6-8, and then adding 3-5 parts of an anhydride modifier dropwise, and reacting at 0-5 DEG C to obtain a modified biomass material;

[0045] 3) mixing the modified biomass material with 2-4 parts of a conjugated monomer and 0.08-0.1 parts of a dopant, controlling the temperature to be 0-3 DEG C, adding 3-5 parts of an oxidizing agent dropwise, and then performing centrifugation, washing, purification, and freeze-drying to obtain a biomass-modified conductive polymer;

[0046] 4) adding 8-10 parts of the deep eutectic liquid into 20-30 parts of a surfactant, ultrasonic dispersing, and then adding 1-3 parts of a hydrophobic monomer, 0.08-0.1 parts of a crosslinking agent and 2-4 parts of the biomass-modified conductive polymer prepared in step 3) into the mixture, passing a protective gas, adding 0.1-0.3 parts of an initiator dropwise, and reacting at 65-80 DEG C for 30 min to obtain the biomass-modified hydrophobic electronic conductive polymer gel material.

[0047] The features and performances of the application are further described in detail in the following examples.

[0048] Example 1

[0049] 1) preparation of the deep eutectic liquid: mixing and reacting 1:2 molar ratio of n-octyl trimethyl ammonium bromide and maleic acid diethyl ester at 80 DEG C under reflux for 2 h, and freeze-drying to obtain the deep eutectic liquid for standby use;

[0050] 2) dissolving 2 parts of hydrophilic heparin in a Tris buffer solution, adjusting the pH to 8, and then adding 3 parts of NA-acid anhydride dropwise, and reacting at 0-5 DEG C for three hours to obtain methacrylated heparin;

[0051] 3) To the methyl methacrylate modified heparin, 2 parts of angelic acid anhydride and 0.08 parts of tannic acid were added, and 3 parts of peracetic acid was added dropwise at a temperature of 0-3°C, and reacted for 24 hours at low temperature. After centrifugation, ethanol washing and purification, the biomass material modified conductive polymer was obtained by freeze-drying;

[0052] 4) To 20 parts of 1% carboxylic acid imidazoline solution, 8-10 parts of eutectic liquid prepared in step 1) was added and ultrasonically dispersed for 30 minutes, then 3 parts of isooctyl acrylate, 0.08 parts of MBA and 2 parts of product of step 3) were added at 60°C and purged with N2 for 1 hour, 0.1 parts of APS was added dropwise, and reacted at 70°C for 30 minutes to obtain a biomass modified hydrophobic electronic conductive polymer gel material.

[0053] The role of N2 is mainly to remove oxygen, to exclude the interference of oxygen, so as to further carry out crosslinking reaction.

[0054] Example 2

[0055] 1) Preparation of eutectic liquid: n-octyl trimethyl ammonium bromide and maleic acid diethyl ester in a molar ratio of 1:4 were reacted at 80°C under reflux for 2 hours, and freeze-dried to obtain the eutectic liquid for standby;

[0056] 2) 2-4 parts of maltodextrin and gum arabic in a mass ratio of 1:1 were dissolved in phosphate buffer solution, the pH was adjusted to 8, and 4 parts of itaconic anhydride was added dropwise, and reacted at 0-5°C for 3 hours to obtain a methyl methacrylate modified biomass material;

[0057] 3) To the methyl methacrylate modified heparin, 2 parts of angelic acid anhydride and 0.08 parts of tannic acid were added, and 3 parts of peracetic acid was added dropwise at a temperature of 0-3°C, and reacted for 24 hours at low temperature. After centrifugation, ethanol washing and purification, the biomass material modified conductive polymer was obtained by freeze-drying;

[0058] 4) To 20 parts of 1% carboxylic acid imidazoline solution, 8-10 parts of eutectic liquid prepared in step 1) was added and ultrasonically dispersed for 30 minutes, then 3 parts of isooctyl acrylate, 0.08 parts of MBA and 2 parts of product of step 3) were added at 60°C and purged with N2 for 1 hour, 0.1 parts of APS was added dropwise, and reacted at 70°C for 30 minutes to obtain a biomass modified hydrophobic electronic conductive polymer gel material.

[0059] Example 3

[0060] 1) Preparation of eutectic liquid: tetra-n-octyl ammonium bromide and trichloronitrite furfuryl ester in a molar ratio of 1:2 were reacted at 80°C under reflux for 2 hours, and freeze-dried to obtain the eutectic liquid for standby;

[0061] 2) 2 parts of konjac and carboxymethyl chitosan with a mass ratio of 2:1 were dissolved in a sodium phosphate dibasic-sodium phosphate monobasic buffer solution, and 3 parts of maleic acid glycoside was added dropwise after adjusting the pH to 8. The reaction was carried out at 0-5°C for 3 hours to obtain a methyl methacrylate modified biomass material;

[0062] 3) 3 parts of 1-vinyl-3-butyl imidazole bromide and 0.1 parts of sulfamic acid were added to the methyl methacrylate modified biomass material obtained in step 2), and 3 parts of hydrogen peroxide was added dropwise at a temperature of 0-3°C for low-temperature reaction for 24 hours. After centrifugation, ethanol washing and purification, and freeze-drying, a biomass material modified conductive polymer was obtained;

[0063] 4) 20 parts of 1% dodecyl dimethyl betaine were added to 9 parts of the eutectic liquid prepared in step 1) in step 1), and ultrasonic dispersion was carried out for 30 minutes. Then, 1 part of methyl methacrylate, 0.09 parts of MBA and 2 parts of the product of step 3) were added under N2 at 60°C for 1 hour, and 0.3 parts of KPS was added dropwise. The reaction was carried out at 70°C for 30 minutes to obtain a biomass modified hydrophobic electronic conductive polymer gel material.

[0064] Example 4

[0065] 1) Preparation of a deep eutectic liquid: octadecyl trimethyl ammonium bromide and diethyl maleate in a molar ratio of 1:2 were reacted at 80°C under reflux for 2 hours, and freeze-drying was carried out to obtain a deep eutectic liquid for standby use;

[0066] 2) 4 parts of gelatin were dissolved in an imidazole-hydrochloride buffer solution, and the pH was adjusted to 6. Then, 4 parts of 2,3-dimethyl maleic anhydride was added dropwise, and the reaction was carried out at 0-5°C for 3 hours to obtain a methyl methacrylate modified biomass material;

[0067] 3) 3 parts of 1-(3-sulfopropyl)-2-vinyl pyridine hydroxide inner salt and 0.08 parts of p-toluene sulfonic acid were added to the methyl methacrylate modified biomass material obtained in step 2), and 3-5 parts of iron permanganate was added dropwise at a temperature of 0-3°C for low-temperature reaction for 24 hours. After centrifugation, ethanol washing and purification, and freeze-drying, a biomass material modified conductive polymer was obtained;

[0068] 4) 30 parts of 1% lauryl alcohol sodium sulfate were added to 9 parts of the deep eutectic liquid prepared in step 1) in step 1), and ultrasonic dispersion was carried out for 30 minutes. Then, 2 parts of hydroxyethyl acrylate, 0.1 parts of MBA and 2 parts of the product of step 3) were added under N2 at 60°C for 1 hour, and 0.2 parts of BPO was added dropwise. The reaction was carried out at 90°C for 30 minutes to obtain a biomass modified hydrophobic electronic conductive polymer gel material.

[0069] Example 5

[0070] 1) Preparation of deep eutectic liquid: octadecyl trimethyl ammonium bromide and gold napthoate in a molar ratio of 1:3 were reacted at 80 °C for 2 h under reflux, and then freeze-dried to obtain a deep eutectic liquid for standby;

[0071] 2) 3 parts of heparin and konjac in a mass ratio of 1:2 were dissolved in a phosphate buffer solution, the pH was adjusted to 8, and then 3 parts of crotonic anhydride was added dropwise, and reacted at 0-5 °C for 3 hours to obtain a methacrylated biomass material;

[0072] 3) 3 parts of 1-vinyl-3-butylimidazole bromide and 0.08-0.1 parts of lactic acid were added to the methacrylated biomass material obtained in step 2), and 3 parts of hydrogen peroxide was added dropwise at a temperature of 0-3 °C for low-temperature reaction for 24 h, and then centrifuged, washed with ethanol, and freeze-dried to obtain a biomass material modified conductive polymer;

[0073] 4) 10 parts of the deep eutectic liquid prepared in step 1) was ultrasonically dispersed in 30 parts of 1% dodecyl dimethyl betaine, and then 2 parts of isooctyl acrylate, 0.008 parts of MBA, and 2 parts of the product of step 3) were added, and then N2 was passed at 60 °C for 1 h, 0.2 parts of KPS was added dropwise, and reacted at 70 °C for 30 min to obtain a biomass modified hydrophobic electronic conductive polymer gel material.

[0074] Example 6

[0075] 1) Preparation of deep eutectic liquid: bis (octyl dimethyl) ammonium chloride and diethyl maleate in a molar ratio of 1:2 were reacted at 80 °C for 2 h under reflux, and then freeze-dried to obtain a deep eutectic liquid for standby;

[0076] 2) 4 parts of konjac was dissolved in a Tris buffer solution, the pH was adjusted to 8, and then 3 parts of NA-acid anhydride was added dropwise, and reacted at 0-5 °C for 3 hours to obtain a methacrylated biomass material;

[0077] 3) 3 parts of 1-vinyl-3-ethyl imidazole bromide and 0.1 parts of citric acid were added to the methacrylated biomass material obtained in step 2), and 3 parts of perchloric acid was added dropwise at a temperature of 0-3 °C for low-temperature reaction for 24 h, and then centrifuged, washed with ethanol, and freeze-dried to obtain a biomass material modified conductive polymer;

[0078] 4) 8-10 parts of the deep eutectic liquid prepared in step 1) was ultrasonically dispersed in 20 parts of 1% sodium cocoyl sulfate, and then 3 parts of stearyl methacrylate, 0.008 parts of MBA, and 2 parts of the product of step 3) were added, and then N2 was passed at 60 °C for 1 h, 0.3 parts of APS was added dropwise, and reacted at 70 °C for 30 min to obtain a biomass modified hydrophobic electronic conductive polymer gel material.

[0079] The mechanical properties of the above examples were tested, and the test results are as followsFigure 1 The results are shown in Figure 1. It can be seen that the biomass modified hydrophobic electronic conductive polymer gel material has excellent mechanical properties. Figure 1 The results are shown in Figure 1. It can be seen that the biomass modified hydrophobic electronic conductive polymer gel material has excellent mechanical properties.

[0080] The results are shown in Figure 1. It can be seen that the biomass modified hydrophobic electronic conductive polymer gel material has excellent mechanical properties. Figure 2 The results are shown in Figure 1. It can be seen that the biomass modified hydrophobic electronic conductive polymer gel material has excellent mechanical properties.

[0081] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the specific embodiments of the present application can still be modified or replaced by equivalents without departing from the spirit and scope of the present application, and any modification or equivalent replacement should be covered within the protection scope of the claims of the present application.

Claims

1. A method for preparing a biomass-modified hydrophobic electronically conductive polymer gel material, characterized in that: include: 1) A hydrophobic hydrogen bond donor and a hydrophobic hydrogen bond acceptor are mixed and reacted at a molar ratio of 1:(2-4), and freeze-dried to obtain a hydrophobic deep eutectic liquid; 2) Dissolve 2-4 parts of biomass material in 20-30 parts of buffer solution, adjust the pH to 6-8, then dropwise add 3-5 parts of anhydride modifier, and react at 0-5°C to obtain the modified biomass material; 3) mixing the modified biomass material with 2-4 parts of a conjugated monomer and 0.08-0.1 parts of a dopant, adding 3-5 parts of an oxidant dropwise at a temperature controlled at 0-3°C, centrifuging, washing, purifying, and freeze-drying after the reaction to obtain a biomass material-modified conductive polymer; 4) adding 8-10 parts of deep eutectic liquid to 20-30 parts of surfactant and ultrasonically dispersing the mixture, then adding 1-3 parts of hydrophobic monomer, 0.08-0.1 parts of cross-linking agent, and 2-4 parts of the biomass material-modified conductive polymer prepared in step 3) to the mixture, passing protective gas, dropwise adding 0.1-0.3 parts of initiator, and reacting at 65-80° C. for 30 minutes to obtain a biomass-modified hydrophobic electronic conductive polymer gel material; The hydrophobic deep eutectic liquid is composed of a hydrophobic hydrogen bond donor and a hydrophobic hydrogen bond acceptor in a molar ratio of 1:(2-4); The hydrophobic hydrogen bond donor is trioctylmethylammonium bromide, n-octyltrimethylammonium bromide, tetra-n-octylammonium bromide, octadecyltrimethylammonium bromide or dioctyldimethylammonium chloride; The hydrophobic hydrogen bond acceptor is ethylparaben, methylparaben, diloxanide furoate, or diethyl maleate; The biomass material is one or more of heparin, maltodextrin, cassava starch, carboxymethyl chitosan, gelatin, gum arabic, konjac and hydroxypropyl chitosan; The anhydride modifier is angelic anhydride, NA-anhydride, crotonic anhydride, itaconic anhydride, maleic anhydride or 2,3-dimethylmaleic anhydride; The conjugated monomer is 1-(3-sulfopropyl)-2-vinylpyridine hydroxide inner salt, 3-(2-nitrovinyl)pyridine, 1-vinyl-3-butylimidazolium bromide or 1-vinyl-3-ethylimidazolium bromide; The hydrophobic monomer is isooctyl acrylate, ethyl acrylate, octadecyl methacrylate or hydroxyethyl acrylate.

2. The method for preparing a biomass-modified hydrophobic electronically conductive polymer gel material according to claim 1, characterized in that: The cross-linking agent is MBA; The initiator is ammonium persulfate, potassium persulfate or BPO.

3. The method for preparing a biomass-modified hydrophobic electronically conductive polymer gel material according to claim 1, characterized in that: The doping agent is tannic acid, p-toluenesulfonic acid, aminosulfonic acid, citric acid, lactic acid or formic acid; The oxidant is peracetic acid, perchloric acid, hypochlorous acid, ammonium persulfate, potassium dichromate, hydrogen peroxide, potassium permanganate or ferric permanganate.

4. The method for preparing a biomass-modified hydrophobic electronically conductive polymer gel material according to claim 1, characterized in that: The buffer solution is Tris buffer solution, phosphate buffer, disodium hydrogen phosphate-sodium dihydrogen phosphate buffer or imidazole-hydrochloride buffer; The surfactant is dodecyl dimethyl betaine, carboxylate imidazoline, sodium coconut sulfate, sodium lauryl sulfate or cocamidopropyl betaine.

5. A biomass-modified hydrophobic electronically conductive polymer gel material prepared by the preparation method according to any one of claims 1 to 4.

6. Use of the biomass-modified hydrophobic electronically conductive polymer gel material according to claim 5 in the preparation of flexible sensors.

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