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PAA bi-crosslinking network self-healing hydrogel capacitive pressure sensor

A pressure sensor, hydrogel technology, applied in instruments, measuring force, measuring devices, etc., can solve the problems of restricted hydrogel development, unsatisfactory comprehensive properties, etc., to enhance tensile properties and self-healing ability , Excellent self-healing ability, short production cycle effect

Inactive Publication Date: 2018-12-21
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the comprehensive properties are still unsatisfactory, which greatly restricts the development of hydrogels.

Method used

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  • PAA bi-crosslinking network self-healing hydrogel capacitive pressure sensor
  • PAA bi-crosslinking network self-healing hydrogel capacitive pressure sensor
  • PAA bi-crosslinking network self-healing hydrogel capacitive pressure sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 2g of acrylic acid, 0.05g of acrylamide, 4mg of MBAA, 10mg of APS, and add 0-1.2mol% of FeCl relative to the amount of acrylic acid 3 ·6H 2 O, stir in 10mL of aqueous solution for 30 minutes and mix well, pass nitrogen gas for 30 minutes to remove the gas in the solution, pour the solution into a polytetrafluoroethylene mold, polymerize at 60°C for 30 minutes, and obtain different Fe 3+ concentrated hydrogel. When the content of acrylamide is 0g, FeCl 3 ·6H 2 When the O content is 0.72mol%, it is labeled as PAA / Fe 3+ Hydrogel; when the acrylamide content is 2.5wt%, FeCl 3 ·6H 2 When the O content is 0 mol%, it is labeled as PAA-PAM hydrogel.

Embodiment 2

[0026] Change Example 1 to get 2g acrylic acid, 0.05g acrylamide, 10mg APS, 0.054g FeCl 3 ·6H 2 O, the content of MBAA added is 0-0.325wt% relative to the mass of acrylic acid. After stirring in 10mL of aqueous solution for 30 minutes and mixing evenly, nitrogen gas is passed for 30 minutes to remove the gas in the solution. Polymerization takes place at 60°C for 30 minutes to obtain different The hydrogel of MBAA concentration, all the other steps are identical with embodiment 1.

Embodiment 3

[0028] Change Example 1 to get 2g acrylic acid, 4mg MBAA, 10mg APS, 0.054g FeCl 3 ·6H 2O, the content of adding acrylamide is 0-25wt% relative to the mass of acrylic acid. Stir in 10mL of aqueous solution for 30 minutes and mix evenly, then pass nitrogen gas for 30 minutes to remove the gas in the solution, and polymerize at 60°C for 30 minutes to obtain different The hydrogel of acrylamide concentration, other steps are identical with embodiment 1. When the acrylamide content is 2.5wt%, FeCl 3 ·6H 2 When the O content is 0.72mol%, it is labeled as PAA-PAM / Fe 3+ Hydrogels.

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Abstract

The invention belongs to the technical fields of new materials and sensors and discloses a preparation method of a PAA (polyacrylic acid) bi-crosslinking network self-healing hydrogel capacitive pressure sensor. According to the method, first, acrylic acid and acrylamide are used as base materials, iron ions are added to form coordination, and a uniform physical and chemical crosslinking double-layer three-dimensional net structure is formed. Obtained hydrogel has strong mechanical properties and quick self-healing characteristics. In order to fully utilize the characteristics of the hydrogel,the hydrogel is made into the capacitive pressure sensor of a "sandwich" structure with conducting layers at two ends being the self-healing hydrogel and a middle dielectric layer being PDMS. The preparation method is simple and wide in material source, has good electrochemical and mechanical properties and has a broad application prospect in the field of flexible wearable materials.

Description

technical field [0001] The invention belongs to the technical field of new materials and sensors, and in particular relates to a preparation method of a PAA double-crosslinked network self-healing hydrogel capacitive pressure sensor. Background technique [0002] Self-healing materials are inspired by nature, imitating the healing of biological damage, and through the mechanism of material supply or energy supply, the micro-damage of the material can be automatically healed as a new biomimetic material. Hydrogels are polymers that can absorb a large amount of water and have a three-dimensional network structure. In recent years, they have been widely used in biomedicine, tissue engineering, agriculture, food, and chemical industries. Recently, with the in-depth study of hydrogels, the self-healing hydrogels have attracted great attention of researchers. Self-healing hydrogels can initiate self-healing mechanisms after external damage to maintain the integrity of the network...

Claims

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Application Information

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IPC IPC(8): G01L1/14C08F220/06C08F220/56C08F222/38
CPCC08F220/06G01L1/142C08F220/56C08F222/385
Inventor 袁宁一王帅丁建宁
Owner CHANGZHOU UNIV
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