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Direct synthesis of temperate sensitive aquogel by ultraviolet radiant polymerization

A temperature-sensitive hydrogel, radiation polymerization technology, applied in the field of polymer material preparation

Inactive Publication Date: 2006-03-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the methods for preparing temperature-sensitive hydrogels at home and abroad are mainly traditional thermal polymerization and γ-ray radiation polymerization. The preparation of temperature-sensitive hydrogels by ultraviolet radiation polymerization is a new method. At present, there is no patent report in China.

Method used

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  • Direct synthesis of temperate sensitive aquogel by ultraviolet radiant polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 3g monomer (N-isopropylacrylamide), 0.5g monomer (acrylic acid), 0.015g photoinitiator (benzoin dimethyl ether), 0.01g crosslinking agent (N, N'-methylenebispropylene amide) was dissolved in 18 mL of deionized water. The prepared solution was placed in a beaker and exposed to a high-pressure mercury lamp for 10 minutes to obtain a cross-linked polymer. 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 temperature-sensitive hydrogel.

Embodiment 2

[0026] 3g monomer (N-isopropylacrylamide), 1g monomer (acrylic acid), 0.2g polymer (polyvinyl alcohol), 0.018g photoinitiator (2-methyl-1-[4-(methyl Thiophenyl)-2-morpholinoacetone]), 0.1 g of cross-linking agent (diethylene glycol diacrylate) were dissolved in 23 mL of deionized water. The prepared solution was placed in a beaker and exposed to a high-pressure mercury lamp for 12 minutes to obtain a cross-linked polymer. 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 temperature-sensitive hydrogel.

Embodiment 3

[0028] 2.5g monomer (N-isopropylacrylamide), 0.3g monomer (acrylic acid), 0.1g polymer (chitosan), 0.03g photoinitiator (α-hydroxyl, α-phenylpropiophenone) , 0.2g cross-linking agent (tripolyethylene glycol diacrylate) was dissolved in 21mL deionized water. The prepared solution was placed in a beaker and exposed to a high-pressure mercury lamp for 15 minutes to obtain a cross-linked polymer. 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 temperature-sensitive hydrogel.

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Abstract

Synthesis of warm sensitive aquagel from ultraviolet light radiation polymerization is carried out by adding reacting raw materials into deionized water to prepare preformed solution, laying aside under ultraviolet light radiation, exposing, polymerizing directly to prepare cross-linking polymer, putting the polymer into sorbitic extractor, extracting from boiled deionized water for 24hrs, taking it out, and drying in vacuum drier to obtain warm sensitive aquagel. Its low critical temperature varies between 30-40 Deg C. with raw material formula. It can be used for various aquagels, medicine control-releasing system, memory element switch, artificial muscle and chemical industrial separation. It achieves low cost, simple process, high efficiency and normal-temperature operation.

Description

technical field [0001] The invention relates to a method for directly synthesizing temperature-sensitive hydrogel by ultraviolet radiation polymerization, which belongs to the field of polymer material preparation. Background technique [0002] 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 hydrogels can respond to changes in external environmental factors such as temperature, pH, light, electric and magnetic fields. Using the deformation properties of stimuli-responsive hydrogels under environmental stimuli, various chemical energy-mechanical energy conversion systems have been conceived, such as artificial muscle models, chemical valves, shape memory materials, controlled drug release, sewage treatment, etc. [0003] Due to the potential application...

Claims

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Application Information

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IPC IPC(8): C08F220/04C08F220/56C08F2/48C08J3/075
Inventor 阮维青王晓工真涛
Owner TSINGHUA UNIV
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