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Composite hydrogel, preparation method and application thereof, and method for stimulating and responding to composite hydrogel by multiple factors

A composite hydrogel, stimuli-responsive technology, applied in the field of shape memory polymer materials

Active Publication Date: 2020-10-30
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More importantly, in the actual application process, with the continuous improvement of people's functional requirements for shape memory polymer materials, single and double sensitive hydrogels have been difficult to meet the needs of the actual application environment, and their applications are limited. Therefore, there is an urgent need Development of smart polymer materials with shape recovery function stimulated by multiple factors

Method used

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  • Composite hydrogel, preparation method and application thereof, and method for stimulating and responding to composite hydrogel by multiple factors
  • Composite hydrogel, preparation method and application thereof, and method for stimulating and responding to composite hydrogel by multiple factors
  • Composite hydrogel, preparation method and application thereof, and method for stimulating and responding to composite hydrogel by multiple factors

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preparation example Construction

[0039] The present invention also provides a method for preparing the composite hydrogel described in the above technical solution, comprising the following steps:

[0040] Under acidic conditions, PVA, CMC, water, DA and a cross-linking agent are mixed to carry out a cross-linking reaction to obtain the composite hydrogel.

[0041] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in this field.

[0042]In the present invention, the order in which the PVA, CMC, water, DA and crosslinking agent are mixed is preferably: DA and the first part of water are first mixed to obtain the DA aqueous solution; the crosslinking agent and the second part of water are second Mix to obtain a cross-linking agent solution; after mixing the PVA, CMC and the remaining water for the third time, then mix with the DA aqueous solution for the fourth time, and then mix with the cross-linking agent aqueous solution for the fif...

Embodiment 1

[0101] (1) Mix 2gPVA, 0.5gCMC and 20mL of double distilled water at 80°C to obtain a mixed solution, wherein the mass concentration of the PVA solution is 0.10g / mL, and the mass concentration of the CMC solution is 0.025g / mL;

[0102] (2) In the obtained mixed solution, add dropwise a hydrochloric acid solution with a molar concentration of 3.0mol / L at a rate of 30 μL / min, adjust the pH value to 2.0, and add 2 mL of hydrochloric acid solution with a molar concentration of 0.2mol / L in a nitrogen atmosphere. DA solution, magnetically stirred for 30min, after mixing evenly, then add 0.5mL glutaraldehyde solution with a mass concentration of 5%, after mixing evenly, pour it into a hydrogel prefabricated mold, and carry out cross-linking in a water bath at 40°C After 20 minutes of reaction, the DA / CMC / PVA composite hydrogel was obtained.

[0103] figure 1It is the HRSEM image of the DA / CMC / PVA composite hydrogel prepared in Example 1. It can be seen from the figure that the surfac...

Embodiment 2

[0118] (1) 3gPVA, 1gCMC and 20mL90°C double distilled water are mixed to obtain a mixed solution, wherein the mass concentration of the PVA solution is 0.15g / mL, and the mass concentration of the CMC solution is 0.05g / mL;

[0119] (1) In the obtained mixed solution, add dropwise a hydrochloric acid solution with a molar concentration of 2.0 mol / L at a rate of 30 μL / min to adjust the pH value to 3.0, and add 2 mL of a hydrochloric acid solution with a molar concentration of 0.8 mol / L in a nitrogen atmosphere. DA solution, magnetically stirred for 30min, after mixing evenly, then add 0.5mL glutaraldehyde solution with a concentration of 10%, after mixing evenly, pour it into the hydrogel prefabricated mold, and carry out the cross-linking reaction under the condition of 60°C water bath , after 20min, the DA / CMC / PVA composite hydrogel was obtained;

[0120] Shape memory and recovery experiments

[0121] Fe 3+ stimulus response

[0122] 5-10g of the DA / CMC / PVA composite hydroge...

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Abstract

The invention provides a composite hydrogel, a preparation method and application thereof, and a method for stimulating and responding to the composite hydrogel by multiple factors, and belongs to thetechnical field of shape memory polymer materials. The composite hydrogel provided by the invention comprises polyvinyl alcohol hydrogel embedded with sodium carboxymethyl cellulose and dopamine, andthe polyvinyl alcohol hydrogel has a network structure obtained by cross-linking reaction among polyvinyl alcohol molecules; the embedding amount of the sodium carboxymethyl cellulose is 5-100 g / L; the embedding amount of the dopamine is 0.5 g / L to 2.5 g / L. The composite hydrogel provided by the invention can achieve the technical effect of programmed shape recovery under the stimulation of triple factors, and can meet the market requirements.

Description

technical field [0001] The invention belongs to the technical field of shape-memory polymer materials, and in particular relates to a composite hydrogel, a preparation method and application thereof, and a method for the composite hydrogel to be stimulated and responded to by multiple factors. Background technique [0002] Shape memory polymer materials refer to a class of intelligent polymer materials that have the ability to maintain a temporarily deformed shape, and can return to the original shape when subjected to external stimuli, thereby exhibiting a memory function for the initial shape. Shape memory polymer materials have many advantages such as low density, large recoverable deformation, and adjustable deformation temperature. Therefore, such materials have broad application prospects in the fields of flexible electronics, biomedicine, and aerospace. [0003] The shape-memory polymer materials commonly used in the market usually only have a single polymer network s...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L29/04C08L1/28C08L79/04C08K5/07
CPCC08J3/075C08J3/246C08J2329/04C08J2401/28C08J2479/04C08K5/07
Inventor 王艳芹朱羽王景辉朱亚萍张雪慧武晓刚陈维毅
Owner TAIYUAN UNIV OF TECH
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