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Self-repairing hydrogel and preparation method and application thereof

A hydrogel and reaction technology, applied in the field of self-healing hydrogel and its preparation, can solve the problems of weak self-healing strength, weak stretchability, environmental pollution, etc., and achieve recycling, burden reduction, high strength, etc. Effect

Active Publication Date: 2021-01-22
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has weak stretchability and no self-healing ability. After being transformed into plastic, it will enter the food chain and cause serious environmental pollution.
At present, there are many studies on sustainable gels and plastics, but sustainable hydrogels with self-healing ability are still in their infancy, and their self-healing strength is weak.

Method used

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  • Self-repairing hydrogel and preparation method and application thereof
  • Self-repairing hydrogel and preparation method and application thereof
  • Self-repairing hydrogel and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Preparation of self-healing hydrogels

[0041] A method for preparing a self-healing hydrogel, comprising the following steps:

[0042] (1) Preparation of modified cyclodextrin

[0043] With a molar ratio of 1:2, weigh polyethylene glycol and isophorone diisocyanate, mix them, and catalyze the reaction at 65°C for 4 hours, then add cyclodextrin in the same molar amount as polyethylene glycol, and react for 8 hours. The product was collected, dialyzed and then freeze-dried to obtain a modified cyclodextrin with certain water dispersibility. For the above reactions, diisocyanate-terminated water-based polyether diols can be connected to cyclodextrin molecules to form a cyclodextrin network connected by hydrophilic chains. Cyclodextrin molecules are affected by water-based polyether diols in the overall network, and have better dispersion in the water phase.

[0044] (2) Preparation of amantadine modified acrylate

[0045] Glycidyl methacrylate and amantadin...

Embodiment 2

[0049] Example 2: Preparation of self-healing hydrogels

[0050] A method for preparing a self-healing hydrogel, comprising the following steps:

[0051] (1) Preparation of modified cyclodextrin

[0052] With a molar ratio of 1:2, weigh the sulfonate polyether diol and diphenylmethane diisocyanate (MDI), mix them, and catalyze the reaction at 65°C for 4 hours, then add the same Molar amount of cyclodextrin, react for 8h. The product was collected, dialyzed and then freeze-dried to obtain a modified cyclodextrin with certain water dispersibility. For the above reactions, diisocyanate-terminated water-based polyether diols can be connected to cyclodextrin molecules to form a cyclodextrin network connected by hydrophilic chains. Cyclodextrin molecules are affected by water-based polyether diols in the overall network, and have better dispersion in the water phase.

[0053] (2) Preparation of amantadine modified acrylate

[0054] Glycidyl methacrylate and amantadine were weig...

Embodiment 3

[0057] Example 3: Preparation of self-healing hydrogels

[0058] A method for preparing a self-healing hydrogel, comprising the following steps:

[0059] (1) Preparation of modified cyclodextrin

[0060] With a molar ratio of 1:2, weigh polyethylene glycol and isophorone diisocyanate, mix them, and catalyze the reaction at 65°C for 4 hours, then add cyclodextrin in the same molar amount as polyethylene glycol, and react for 8 hours. The product was collected, dialyzed and then freeze-dried to obtain a modified cyclodextrin with certain water dispersibility. For the above reactions, diisocyanate-terminated water-based polyether diols can be connected to cyclodextrin molecules to form a cyclodextrin network connected by hydrophilic chains. Cyclodextrin molecules are affected by water-based polyether diols in the overall network, and have better dispersion in the water phase.

[0061] (2) Preparation of amantadine modified acrylate

[0062] Glycidyl methacrylate and amantadin...

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Abstract

The invention belongs to the technical field of high polymer materials, and discloses self-repairing hydrogel and a preparation method and application thereof. The hydrogel comprises modified cyclodextrin and an adamantyl group structure. A main chain of the hydrogel contains adamantyl groups, a unique large-structure framework of the adamantyl groups is just recognized by hydrophobic cavities incyclodextrin, hydrophobic interaction is fixed, and the hydrogel is cross-linked accordingly. The hydrogel can realize self-repairing in the process of converting a colloidal state into a plastic state, and the converted plastic has good mechanical strength. The self-repairing hydrogel is repaired or the plastic is reassembled through alkali liquor so that the repaired plastic interface can bear the force of more than 100N. In the reassembly process, the plastic can be recycled while ensuring that the plastic has higher strength, thereby greatly reducing the burden of the traditional petroleumhydrocarbon-derived hydrogel and the hydrogel plastic thereof on the environment.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a self-repairing hydrogel and its preparation method and application. Background technique [0002] In recent years, with global warming and resource shortages, people's awareness of environmental protection has gradually increased. Sustainable materials have become an urgent need to alleviate and respond to environmental challenges. [0003] As a widely used material, hydrogel has been widely used in electronic skins, self-diagnostic instruments, Soft robots and wearable electronics, etc. For a long time, how to design and prepare sustainable (environmentally friendly, recyclable) hydrogels has become a huge challenge. Generally, two approaches can be adopted to prepare sustainable hydrogels. One is to use new natural materials, such as biomass (DNA, wood) to prepare hydrogels, which have the advantages of renewable, sustainable and environmental friend...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/36C08F220/56C08F2/50C08L51/08
CPCC08F283/006C08F2/50C08L51/08C08F220/36C08F220/56
Inventor 徐秀彬陈俊民吴旭陆雨于丹凤李云龙
Owner GUANGZHOU UNIVERSITY
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