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PVA (Polyvinyl Alcohol) sodium alginate dual-network cold-resistant conductive hydrogel and preparation method thereof

A conductive hydrogel and sodium alginate technology, applied in the field of hydrogel preparation, can solve the problems of poor cold resistance of self-healing hydrogel

Active Publication Date: 2019-08-20
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor cold resistance of existing self-healing hydrogels, and provide a kind of PVA sodium alginate double-network cold-resistant conductive hydrogel and its preparation method

Method used

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  • PVA (Polyvinyl Alcohol) sodium alginate dual-network cold-resistant conductive hydrogel and preparation method thereof
  • PVA (Polyvinyl Alcohol) sodium alginate dual-network cold-resistant conductive hydrogel and preparation method thereof
  • PVA (Polyvinyl Alcohol) sodium alginate dual-network cold-resistant conductive hydrogel and preparation method thereof

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preparation example Construction

[0022] The present invention firstly provides a preparation method of PVA sodium alginate double-network cold-resistant conductive hydrogel, the reaction process and principle schematic diagram are as follows figure 1 As shown, the method includes:

[0023] Step 1: Dissolve sodium alginate in deionized water, add EDC·HCl and m-aminophenylboronic acid to react, the reaction temperature is preferably room temperature, and the reaction time is preferably 20-24h, and the product is dialyzed, and the dialysis The time is preferably 5-7 days, then lyophilized, and then the lyophilized product is dissolved in deionized water and stirred, the stirring rate is preferably 800-1000r / min, and the stirring time is preferably 3-5h to obtain the first solution ;

[0024] The mass ratio of the sodium alginate, EDC·HCl and m-aminophenylboronic acid is preferably (1-1.5): (0.96-1.0): 0.33, more preferably 1: 0.96: 0.33; the lyophilized The mass g of the product: the volume mL of deionized wat...

Embodiment 1

[0032] Step 1: Take 2.5g (0.125mol) of sodium alginate and dissolve it in deionized water, add 2.4g (12.5mol) of EDC HCl and 0.825g (6.25mol) of m-aminophenylboronic acid, stir at room temperature for 24h, and dialyze the product. The size of the bag is 14000, dialysis for 7 days, change the water every 24 hours, put the dialysate into a freeze dryer and freeze-dry to obtain modified sodium alginate, weigh 0.5g of modified sodium alginate and dissolve it in 10ml of deionized water , magnetically stirred at a speed of 900r / min at room temperature for 4h until completely dissolved to obtain the first solution;

[0033] Step 2: Add 10ml of glycerin to 10ml of deionized water at room temperature and continue to stir with a magnetic stirrer for 10min until the two phases are completely miscible. Dissolve 2g of PVA and polyaniline 0.04 in 20ml of deionized water and glycerin mixture with a volume ratio of 1:1 , under the condition of 90°C, magnetically stir at a speed of 1000r / min f...

Embodiment 2

[0040] Step 1: Take 2.5g (0.125mol) of sodium alginate and dissolve it in deionized water, add 2.4g (12.5mol) of EDC HCl and 0.825g (6.25mol) of m-aminophenylboronic acid, stir at room temperature for 24h, and dialyze the product. The size of the bag is 14000, dialysis for 7 days, change the water every 24 hours, put the dialysate into a freeze dryer and freeze-dry to obtain modified sodium alginate, weigh 0.5g of modified sodium alginate and dissolve it in 10ml of deionized water , magnetically stirred at a speed of 900r / min at room temperature for 4h until completely dissolved to obtain the first solution;

[0041] Step 2: Add 10ml of glycerin to 10ml of deionized water at room temperature and continue to stir with a magnetic stirrer for 10min until the two phases are completely miscible. Dissolve 1.5g of PVA and polyaniline 0.05 in 20ml of deionized water and glycerin mixture with a volume ratio of 1:1 At 95°C, stir magnetically at a speed of 1000r / min for 2h until the PVA ...

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Abstract

The invention provides PVA (Polyvinyl Alcohol) sodium alginate dual-network cold-resistant conductive hydrogel and a preparation method thereof and belongs to the technical field of hydrogel preparation. The method comprises the following steps: dissolving sodium alginate into deionized water, adding EDC*HCl to react with aminophenylboronic acid, dialyzing and freeze-drying the product, and dissolving the freeze-dried product into the deionized water, and stirring to obtain a first solution; dissolving PVA and polyaniline into a mixed solution of deionized water and glycerin so as to obtain asecond solution; and mixing the first solution and the second solution, thereby obtaining the PVA sodium alginate dual-network cold-resistant conductive hydrogel. The hydrogel disclosed by the invention can still maintain excellent conductivity and self-healing property at a low temperature, and can be applied to the fields of electronic skin, biological or chemical sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of hydrogel preparation, and in particular relates to a PVA sodium alginate double-network cold-resistant conductive hydrogel and a preparation method thereof. Background technique [0002] Hydrogel is a material with a three-dimensional hydrophilic network structure, which can absorb a large amount of water and expand in volume, but is insoluble in water. Due to their unique structure, they are widely used in many fields such as medical treatment, pharmaceutical and chemical industry. The water retention capacity of hydrogel comes from the hydrophilic groups in the material, such as -OH, -COOH, -CONH 2 , -CONH-, -SO 3 H. Due to the affinity between water and the hydrogel network, water may exist in the three-dimensional network in the form of bound water, bound water and free water, and lose fluidity, so the hydrogel can maintain a certain shape. Self-healing hydrogels, as a type of hydrogel, have the a...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L29/04C08L79/02C08L5/04C08K5/053C08B37/04
CPCC08J3/075C08B37/0084C08J2329/04C08J2479/02C08J2405/04
Inventor 吴广峰靳凯运张会轩
Owner CHANGCHUN UNIV OF TECH
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