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Electronic beam radiopolymerization process of directly synthesizing pH sensitive polymer hydrogel

An electron beam radiation, polymer technology, applied in the field of electron beam radiation polymerization to directly synthesize pH-sensitive polymer hydrogels

Inactive Publication Date: 2007-06-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, the methods for preparing pH-sensitive hydrogels at home and abroad are mainly traditional thermal polymerization and γ-ray radiation polymerization. Electron beam radiation polymerization is a new method to directly synthesize pH-sensitive hydrogels. any patent coverage

Method used

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  • Electronic beam radiopolymerization process of directly synthesizing pH sensitive polymer hydrogel
  • Electronic beam radiopolymerization process of directly synthesizing pH sensitive polymer hydrogel

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Experimental program
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Effect test

Embodiment 1

[0026] 5g monomer (acrylic acid), 1.3g monomer (2-methacryloyloxyethyltrimethylammonium chloride), 0.35g monomer (methacrylic acid), 0.45g monomer (maleic anhydride ), 0.25g of cross-linking agent (tetrapolyethylene glycol diacrylate), 0.05g of additive (methylolacrylamide), and 0.025g of additive (chitosan) were dissolved in 16mL of deionized water. The prepared solution is placed in a beaker, and the cross-linked polymer is obtained by electron beam radiation. Put the cross-linked polymer into a Soxhlet extractor and extract it with boiling deionized water for 24 hours, take it out and put it into a vacuum oven to dry to obtain a pH-sensitive hydrogel.

Embodiment 2

[0028] 5g monomer (acrylic acid), 2.53g monomer (2-methacryloyloxyethyltrimethylammonium chloride), 0.33g monomer (methacrylic acid), 0.52g monomer (maleic anhydride ), 0.018g of crosslinking agent (N,N'-methylenebisacrylamide), 0.053g of additive (methylolacrylamide) were dissolved in 15mL of deionized water. The prepared solution is placed in a beaker, and the cross-linked polymer is obtained by electron beam radiation. Put the cross-linked polymer into a Soxhlet extractor and extract it with boiling deionized water for 24 hours, take it out and put it into a vacuum oven to dry to obtain a pH-sensitive hydrogel.

Embodiment 3

[0030] 5g monomer (acrylic acid), 1.2g monomer (2-methacryloyloxyethyltrimethylammonium chloride), 0.23g monomer (methacrylic acid), 0.51g monomer (maleic anhydride ), 0.24g of crosslinking agent (tripolyethylene glycol diacrylate), 0.05g of additive (polyvinyl alcohol), and 0.015g of additive (N-isopropylacrylamide) were dissolved in 16mL of deionized water. The prepared solution is placed in a beaker, and the cross-linked polymer is obtained by electron beam radiation. Put the cross-linked polymer into a Soxhlet extractor and extract it with boiling deionized water for 24 hours, take it out and put it into a vacuum oven to dry to obtain a pH-sensitive hydrogel.

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Abstract

The present invention is electronic beam radiopolymerization process of synthesizing pH sensitive hydrogel directly, and belongs to the field of pH sensitive hydrogel preparing technology. Material monomer, cross-linking agent and additive in the weight ratio of 75-99.7 to 0.1- 25 to 0.1-10 are dissolved in deionized water and polymerized through electron radiation to form cross-linked polymer. The cross-linked polymer is then extracted in a Soxhlet extractor with boiled deionized water for 24 hr and dried in a vacuum oven to obtain the pH sensitive hydrogel. The present invention has the features of low power consumption, simple technological process, high polymerization efficiency, no waste water pollution, low cost, normal temperature and normal pressure operation, etc.

Description

technical field [0001] The invention relates to a method for directly synthesizing pH-sensitive polymer hydrogel through electron beam radiation polymerization, and belongs to the technical field of pH-sensitive polymer hydrogel preparation methods. Background technique [0002] Hydrogel is a multi-component system composed of a three-dimensional cross-linked network structure polymer and a medium. Because of its unique stimulus-response behavior, it has been used in drug release systems, memory element switches, separation of chemical materials, chemical machinery, artificial muscles, etc. The field shows a good application prospect, which has attracted the attention of many scholars at home and abroad. Stimuli-responsive hydrogels are a type of hydrogels whose properties will change significantly in response to slight physical or chemical stimuli from the external environment. It is a water-insoluble, water-swellable, hydrophilic cross-linked polymer. Stimuli-responsive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/52C08F20/06
Inventor 阮维青王晓工何滔陈朝任
Owner TSINGHUA UNIV
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