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Low-temperature-resistant self-healing hydrogel preparation method and application

A hydrogel, self-healing technology, applied in applications, strain gauges, sensors, etc., can solve the problems of limiting the application prospects of hydrogels, short storage time, and easy loss of water, so as to improve toughness and mechanical properties , enhanced intermolecular force, high sensitivity effect

Active Publication Date: 2019-07-26
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, hydrogels are easy to lose water, and the storage time at room temperature is not long, and the water in the hydrogel will freeze when the temperature is below zero or in more extreme cases, which greatly limits the ability of hydrogels. application prospects
The existing low-temperature-resistant self-healing hydrogels cannot balance the excellent low-temperature resistance and outstanding self-healing properties (Qinfeng Rong, Wenwei Lei, Lie Chen, et al, Angew.Chem.Int.Ed.10.1002 / anie.201708614)

Method used

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  • Low-temperature-resistant self-healing hydrogel preparation method and application
  • Low-temperature-resistant self-healing hydrogel preparation method and application
  • Low-temperature-resistant self-healing hydrogel preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) 10 grams, 15 grams and 20 grams of polyvinyl alcohol (molecular weight is 95000, and the degree of hydrolysis is 95%) are added to 90 grams, 85 grams and 80 grams of deionized water and ethyl alcohol dispersed with redox graphene respectively. In a diol solvent (the solvent ratio of deionized water to ethylene glycol is 2:1, and the concentration of redox graphene is 0.5mg / mL), stir at 90°C for 3 hours until the PVA is completely dissolved to form a uniform mass PVA mixed solutions with concentrations of 10wt%, 15wt% and 20wt%.

[0041] (2) Dissolve 1.5 grams of borax in a mixed solvent of 98.5 mL of deionized water and ethylene glycol dispersed with redox graphene (the solvent ratio of deionized water and ethylene glycol is 2:1, and the concentration of redox graphene 0.5 mg / mL), heated and stirred at 60°C for 30 minutes to dissolve completely, and prepared a 1.5 mg / mL borax mixed solution.

[0042] (3) Take PVA mixed solutions of different mass concentrations in ...

Embodiment 2

[0044] (1) get 20 grams of polyvinyl alcohol (molecular weight is 95000, degree of hydrolysis is 95%) joins in the mixed solution of deionized water and ethylene glycol that 80 grams are dispersed with redox graphene (deionized water and ethylene glycol The ratio of alcohol is 2:1, the redox graphene concentration is 0.5mg / mL), heated at 90°C and stirred for 3 hours, until the PVA is completely dissolved to form a uniform 20wt% PVA mixed solution.

[0045] (2) 0.5 g, 1.0 g, 1.5 g, 2.0 g, and 2.5 g of borax were dissolved in 99.5 mL, 99.0 mL, 98.5 mL, 98.0 mL, and 97.5 mL of deionized water and ethylene dioxide dispersed with redox graphene, respectively. In a mixed solvent of alcohol (the ratio of deionized water to ethylene glycol is 2:1, and the redox graphene concentration is 0.5mg / mL), heat and stir at 60°C for 30 minutes to dissolve completely, and prepare 0.5mg / mL, 1.0 mg / mL, 1.5mg / mL, 2.0mg / mL and 2.5mg / mL borax mixed solutions.

[0046] (3) Take the PVA mixed solution...

Embodiment 3

[0048] (1) Get 20 grams of polyvinyl alcohol (molecular weight is 95000, degree of hydrolysis is 95%) and add 80 grams of redox graphene dispersed in deionized water and ethylene glycol mixed solution (deionized water and ethylene glycol The ratios are 3:1, 2:1, 1:1 and 1:2 respectively, and the redox graphene concentration is 0.5mg / mL), heated at 90°C and stirred for 3 hours, until the PVA is completely dissolved to form a uniform different Solvent ratio of PVA mixed solution.

[0049] (2) Dissolve 1.5 grams of borax in a mixed solution of 98.5 mL of redox graphene-dispersed deionized water and ethylene glycol (the solvent ratios of deionized water and ethylene glycol are 3:1, 2:1, respectively. , 1:1 and 1:2, the redox graphene concentration is 0.5mg / mL), heated and stirred at 60°C for 30 minutes to dissolve completely, and prepared borax mixed solutions with different solvent ratios.

[0050] (3) Take PVA mixed solutions with different solvent ratios in a beaker, add the s...

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Abstract

The invention relates to a hydrogel and discloses a low-temperature-resistant self-healing hydrogel preparation method and application. The method includes: respectively subjecting polyvinyl alcohol powder and borax to heating and stirring in redox graphene mixed solution of ethylene glycol and deionized water to completely dissolve to form uniform PVA mixed solution and borax mixed solution; adding equal-mass borax mixed solution into the PVA mixed solution, and slowly stirring at 90 DEG C to enable complete cross-linking gelatinization; subjecting a gelatinization product to compression moulding in a mould to form dual reticulated PVA-Rgo / H2O-Eg hydrogel. The hydrogel has high stability and high sensitivity coefficient in a range of -10-60 DEG C. The low-temperature-resistant self-healing hydrogel preparation method is simple, and the prepared hydrogel is extensive in raw material and excellent in toughness, low-temperature resistance and self-healing property, can be used for preparation of high-sensitivity resistance strain sensors and has a promising application prospect in fields of flexible robots, intelligent wear and the like.

Description

technical field [0001] The invention relates to a hydrogel, in particular to a preparation method and application of a hydrogel with toughness, self-healing and low-temperature resistance properties. Background technique [0002] With the popularity of smart terminals, wearable flexible electronic devices present a huge market prospect. As the core component of flexible electronic devices, flexible strain sensors have broad application prospects in electronic skin, human health monitoring, implantable devices, human-computer interaction systems, etc., and have become a key research direction in the field of hydrogel materials. In practical applications, it is very important to ensure the sensitivity and reliability of the sensing signal, which puts high demands on the strain sensitivity and linear response of hydrogels, and is also an important bottleneck problem faced by most current hydrogel stress-strain sensors. . How to achieve high stretchability while ensuring linea...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K3/04C08J3/24G01B7/16A61B5/00
CPCC08J3/24G01B7/16A61B5/683C08J2329/04C08K3/042C08K2201/001A61B2562/0261
Inventor 袁宁一戴胜平丁建宁
Owner CHANGZHOU UNIV
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