Preparation method of cellulose ion conductive hydrogel and prepared hydrogel prepared

An ion-conducting, cellulose technology, applied in conductive materials, conductive materials, conductors, etc., can solve the problems of low stretchability and compressibility, limited application, etc., and achieve high stretchability, high compressibility, and excellent ionic conductivity. sexual effect

Active Publication Date: 2019-03-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure natural polymer-based hydrogels usually have low stretchability and compressibility. In addition, conductive hydrogels contain a large amount of water, which inevitably freezes and does not conduct electricity at subzero temperatures, which severely limits its practical application
Therefore, it is still a considerable challenge to develop conductive pure natural polymer ionically conductive hydrogels with high stretchability, high compressibility, and high frost resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of cellulose ion conductive hydrogel, its preparation method is as follows:

[0030] Step S1. Add 5.1g of α-cellulose to 80g of an aqueous solution with a mass fraction of 7 wt% sodium hydroxide and 12 wt% urea, dissolve in a constant temperature reaction tank at -12.5°C, and stir vigorously to obtain completely dissolved and transparent 6wt% cellulose solution;

[0031] Step S2. Add 28.74 g of allyl glycidyl ether dropwise into the cellulose solution at a rate of 1 to 5 s / drop, and react for 24 hours at 30° C. under the protection of an inert gas, wherein the allyl glycidyl ether The anhydroglucose unit molar ratio on the cellulose in the glyceryl ether and cellulose solution is 8;

[0032] Step S3, washing the product obtained in step S2 with 500 mL of diethyl ether, and rotary evaporating at 30° C. to remove the remaining diethyl ether to obtain 75 g of allyl cellulose solution;

[0033] Step S4, take 10 g of the allyl cellulose solution obtained in step S3,...

Embodiment 2

[0035] A cellulose ion conductive hydrogel, the preparation method is as follows:

[0036] Take 10 g of the allyl cellulose solution obtained in Step S3 of Example 1, add 0.15 g of ammonium persulfate to it, stir vigorously for 3 to 10 min, then centrifuge to remove foam, pour it into a beaker for molding, and react at 30°C for 24 Hours, a hydrogel was obtained after demolding.

Embodiment 3

[0038] A cellulose ion conductive hydrogel, the preparation method is as follows:

[0039]Take 10 g of the allyl cellulose solution obtained in step S3 of Example 1, add 0.20 g of ammonium persulfate to it, stir vigorously for 3 to 10 min, then centrifuge to remove foam, pour it into a beaker for molding, and react at 30°C for 24 Hours, a hydrogel was obtained after demoulding.

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Abstract

The invention discloses a preparation method of a cellulose ion conductive hydrogel and the prepared hydrogel. The preparation method comprises the following steps: S1, adding cellulose in a water solution of sodium hydroxide and urea, dissolving at the temperature of -5 DEG C to -20 DEG C, and stirring to obtain a transparent cellulose solution; S2, dropwise adding allyl glycidyl ether in the cellulose solution, reacting for 20-30 hours at the temperature of 25-35 DEG C and under the protection of an inert gas; S3, cleaning a product obtained in the step S2 with diethyl ether, performing rotary evaporation so as to remove the residual diethyl ether to obtain an allyl cellulose solution; and S4, adding ammonium persulfate in the allyl cellulose solution, stirring for 3-10 minutes, then centrifuging for defoaming, and reacting for 20-30 hours at the temperature of 25-35 hours so as to obtain the hydrogel. The cellulose ion conductive hydrogel provided by the invention has high stretchability, high compressibility, high freezing resistance and excellent ionic conductivity.

Description

technical field [0001] The invention relates to the field of hydrogel technology, in particular, the invention relates to a preparation method of cellulose ion-conductive hydrogel and the prepared hydrogel. Background technique [0002] Modern electronics, such as body wearable sensors, solar energy conversion, or feedback sensors in robots need to develop flexible electrolytes with high stretchability, compressibility, and ion transport. Hydrogels with 3D networks and a large amount of water are A relatively stretchable and compressible material, the water phase in the hydrogel can endow the ion with rapid transport and make the hydrogel have liquid-like conductivity. Stretchable and compressible hydrogels based on natural polymers have attracted extensive attention in electronics due to their safety, biocompatibility, inexhaustibility, and inexhaustibility. Natural polymer-based hydrogels, which combine synthetic polymers or inorganic components with natural polymers, are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F216/14C08J3/075G01B21/32H01B1/12
CPCC08F251/02C08J3/075C08J2351/02G01B21/32H01B1/122C08F216/1416
Inventor 何明辉仝瑞平陈广学潘丹红田君飞
Owner SOUTH CHINA UNIV OF TECH
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