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Preparation method and application of hydrogel of three-layer net structure

A network structure, hydrogel technology, applied in the field of materials, can solve the problems of low sensitivity coefficient, many preparation raw materials, small strain stretching range, etc., to enhance toughness and tensile strength, improve toughness and mechanical properties, good linear effect

Active Publication Date: 2019-08-27
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogel has the ability of stretching and self-healing, but there are many raw materials for preparation, the experimental operation is complicated, and the self-healing efficiency is not high, and the self-healing time is long
At the same time, the strain stretching range of the prepared hydrogel strain sensor is small and the sensitivity coefficient is low.

Method used

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  • Preparation method and application of hydrogel of three-layer net structure
  • Preparation method and application of hydrogel of three-layer net structure
  • Preparation method and application of hydrogel of three-layer net structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Mix 10 grams of polyvinyl alcohol (molecular weight: 95,000, degree of hydrolysis: 95%) with 90 grams of deionized water, then heat and stir at 90°C for 3 hours, until the PVA is completely dissolved to form a transparent mass concentration of 10wt % PVA aqueous solution;

[0039] Step 2: Dissolving 0.9 gram of borax in 99.1 mL of deionized water, stirring for 5 minutes to completely dissolve it, and preparing a borax aqueous solution with a concentration of 0.9 wt %;

[0040] Step 3: Put the PVA aqueous solution obtained in step 1 into a beaker, add an equal volume of borax aqueous solution, and stir slowly with a glass rod for 1 hour to fully cross-link the PVA aqueous solution and borax aqueous solution to form a pre-hydrogel;

[0041] Step 4: Take out an appropriate amount of pre-hydrogel and place it in a polytetrafluoroethylene mold (40×40×2mm 3 ), cover the glass plate and apply a weight of 3 kg to press for 3 hours to make it shape;

[0042] Step 5: Fi...

Embodiment 2

[0044] Change the concentration of the PVA aqueous solution in Step 1 of Implementation 1 to 15 wt%, and keep the rest of the steps unchanged.

Embodiment 3

[0046] Change the concentration of the PVA aqueous solution in Step 1 of Implementation 1 to 20 wt%, and the remaining steps remain unchanged.

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Abstract

The invention provides a preparation method of a hydrogel of a three-layer net structure. A physically and chemically crosslinked double-layer net structure with hydrogen bonds and metal coordinate bonds is formed through crosslinking of polyvinyl alcohol and borax, then, cyclic freezing and thawing are conducted at -18 DEG C, and a crystal domain is formed in the hydrogel to form another layer ofphysically crosslinked structure. The prepared hydrogel of the three-layer net structure has the advantages that the preparation method is simple, the raw material source is wide, and the hydrogel has good transparency, toughness, self-healing performance and mechanical properties and has broad potential application in the fields of flexible robots, smart wearing and human-machine interaction.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a preparation method and application of a triple network structure hydrogel. Background technique [0002] Hydrogel is a polymer material with a three-dimensional network structure containing a large amount of water. It has unique properties such as flexibility and biocompatibility. It has been widely studied and developed in many fields such as electrical devices, sensors, wearable devices, and biomedicine. application. In recent years, with the emphasis on environmental protection, recycling and other fields, the demand for stimuli-responsive and self-healing hydrogel materials is increasing day by day. However, hydrogels consisting of only one dynamically crosslinked network tend to have low tensile strength and are difficult to recover from deformation. This greatly hinders their application in some fields requiring excellent comprehensive properties. [0003] In practic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L29/04C08K3/38G01B7/16G01L1/14
CPCC08J3/075C08J2329/04C08K2003/387G01B7/18G01L1/142
Inventor 丁建宁袁宁一戴胜平程广贵
Owner JIANGSU UNIV
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