Self-repairing conductive hydrogel material and preparation method thereof

A conductive hydrogel, self-healing technology, applied in the field of hydrogel materials, can solve the problems of insufficient mechanical strength, insoluble conductive fillers in water, poor self-healing performance, etc. Repair performance, enhance the effect of mechanical properties

Active Publication Date: 2021-02-02
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these self-healing conductive hydrogels still have some problems that cannot be ignored, such as insufficient mechanical strength, poor self-healing performance, and inconvenient preparation methods, etc.
And because the traditional hydrogen bond and acylhydrazone bond self-healing hydrogel completes the self-healing process by generating hydrogen bond an

Method used

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  • Self-repairing conductive hydrogel material and preparation method thereof
  • Self-repairing conductive hydrogel material and preparation method thereof
  • Self-repairing conductive hydrogel material and preparation method thereof

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preparation example Construction

[0032] The main idea of ​​the embodiment of the present invention is: a preparation method of a self-healing conductive hydrogel material, comprising the following steps:

[0033] 1) adding pyrogallic acid into the dissolved borate solution, adding polypyrrole powder after stirring, and stirring until uniformly dispersed to obtain a mixed solution;

[0034] 2) Mix the mixed liquid with acrylamide monomer, cross-linking agent, and tetramethylethylenediamine, stir fully to dissolve them all, and obtain a reaction system, and then add glycerin and an initiator to the reaction system, And placed at room temperature to form a gel.

[0035] Among them, the compound selected to achieve self-healing in the embodiment of the present invention is pyrogallic acid, which has three hydroxyl groups. The dopamine-like substances produced after oxidation provide more cross-linking points. Make the gel bond more tightly after self-healing, and the reaction is shown in the following formula: ...

Embodiment 1

[0040] (1) Dissolve 0.192g of sodium tetraborate into 16ml of distilled water first, add 0.040g of pyrogallic acid to the solution after it is completely dissolved, and stir for 15 minutes so that pyrogallic acid and sodium tetraborate fully react, use Sodium tetraborate protects the pyrogallic acid. This reaction is a reversible reaction, which can reduce the oxidation rate of pyrogallic acid.

[0041]

[0042](2) Add 0.04 g of carbon black-doped polypyrrole powder (the mass ratio of carbon black to polypyrrole is 4:1) to the above mixture of pyrogallic acid and sodium tetraborate, stir well for 30 seconds to disperse uniform. The carbon black-doped polypyrrole powder of this embodiment is purchased from Sigma-ALDRICH (Sigma-ALDRICH) company, proportioning is the carbon black of the polypyrrole (PPy) of 20% mass ratio and 80% mass ratio, CAS number: 30604 -81-0).

[0043] (3) Transfer the mixture prepared in (2) to an ice-water bath, add 4g of acrylamide monomer, 0.016g...

Embodiment 2

[0046] (1) Dissolve 0.3g of sodium tetraborate into 16ml of distilled water first, add 0.070g of pyrogallic acid to the solution after it is completely dissolved, and stir for 30 minutes to make pyrogallic acid and sodium tetraborate fully react, use Sodium tetraborate protects the pyrogallic acid. This reaction is a reversible reaction, which can reduce the oxidation rate of pyrogallic acid.

[0047] (2) Add 0.08 g of carbon black-doped polypyrrole powder (the mass ratio of carbon black to polypyrrole is 4:1) to the above mixture of pyrogallic acid and sodium tetraborate, and stir for 40 seconds to disperse uniform.

[0048] (3) Transfer the mixture prepared in (2) to an ice-water bath, add 4g of acrylamide monomer, 0.025g of N,N-methylenebisacrylamide, and 100μl of tetramethyl Ethylenediamine was stirred thoroughly to dissolve it all. Afterwards, 1.0 ml of glycerin and 0.80 g of ammonium persulfate were added, and then the mixed solution was transferred out and placed at ...

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Abstract

The invention provides a self-repairing conductive hydrogel material and a preparation method thereof. The method comprises the following steps: 1) adding pyrogallic acid into a dissolved borate solution, then adding polypyrrole powder after stirring, and conducting stirring until uniform dispersion is achieved so as to obtain a mixed solution; and 2) mixing the mixed solution with an acrylamide monomer, a cross-linking agent and tetramethylethylenediamine, conducting full stirring to completely dissolve the mixture to obtain a reaction system, adding glycerin and an initiator into the reaction system, and placing the reaction system at normal temperature to form gel. According to the invention, pyrogallic acid is oxidized under the action of oxygen and water to form dopaquinone substancesto provide a self-repairing capability, and carbon black-modified polypyrrole can be uniformly dispersed in water and provides conductive capability. The prepared hydrogel has the structural characteristics of good mechanical property, conductivity and self-repairability.

Description

technical field [0001] The invention belongs to the technical field of hydrogel materials, in particular to a self-healing conductive hydrogel material and a preparation method thereof. Background technique [0002] As a soft polymer material containing a three-dimensional network structure, hydrogel has been widely used in many fields. Among them, conductive hydrogel combines the advantages of conductive polymer and hydrogel, and is widely used in the field of biomaterials, laboratories Biosensors, biofuel cells, and supercapacitors have great application prospects. However, the strength and toughness of many hydrogels are not good enough to meet the application requirements. Moreover, once ordinary conductive hydrogels are mechanically damaged, their performance will be greatly affected. Therefore, the development of a conductive hydrogel material with a certain strength and self-repairing ability is of great significance for the application and development of hydrogels. ...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/56C08F222/38C08J3/075C08L51/08C08K3/38
CPCC08F283/00C08J3/075C08J2351/08C08K2003/387C08F220/56C08F222/385
Inventor 曹一平陈杨威黄园尤庆亮
Owner JIANGHAN UNIVERSITY
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