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Process of directly synthetizing pH sensitive aquagel polymerized by UV radiation

A technology of radiation polymerization and ultraviolet light, which is applied in the field of preparation of pH-sensitive hydrogel materials, achieves the effects of fast polymerization, low energy consumption, and avoiding high energy consumption

Inactive Publication Date: 2006-09-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the methods for preparing pH-sensitive hydrogels at home and abroad are mainly traditional thermal polymerization and γ-ray radiation polymerization. The direct synthesis of pH-sensitive hydrogels by ultraviolet radiation polymerization is a new method, and there is no such method in China at present. any patent coverage

Method used

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  • Process of directly synthetizing pH sensitive aquagel polymerized by UV radiation

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Experimental program
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Effect test

Embodiment 1

[0024] 5g of monomeric acrylic acid, 2.5g of monomeric 2-methacryloyloxyethyltrimethylammonium chloride, 0.3g of monomeric methacrylic acid, 0.5g of monomeric maleic anhydride, 0.02g of photoinitiator benzoin Dimethyl ether, 0.01 g of crosslinking agent N,N'-methylenebisacrylamide, and 0.05 g of additive methylolacrylamide were dissolved in 15 mL of deionized water. The prepared solution is placed in a beaker, exposed under a high-pressure mercury lamp for 12 minutes (ultraviolet light intensity I=10mW / cm 2 ) 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 in a vacuum oven to dry for more than 24 hours to obtain a pH-sensitive hydrogel.

Embodiment 2

[0026] 5g of monomer acrylic acid, 2g of monomer 2-methacryloyloxyethyltrimethylammonium chloride, 0.3g of monomer maleic anhydride, 0.1g of photoinitiator 1-hydroxycyclohexyl benzophenone, 0.15 Dissolve g crosslinking agent diethylene glycol diacrylate, 0.02 g additive N-isopropylacrylamide in 15 mL deionized water. The prepared solution is placed in a beaker, exposed under a high-pressure mercury lamp for 14 minutes (ultraviolet light intensity I=10mW / cm 2 ) 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 in a vacuum oven to dry for more than 24 hours to obtain a pH-sensitive hydrogel.

Embodiment 3

[0028] 5g of monomeric acrylic acid, 1g of monomeric 2-methacryloxyethyltrimethylammonium chloride, 0.2g of monomeric methacrylic acid, 0.5g of monomeric maleic anhydride, 0.12g of photoinitiator 2- Hydroxy-2-methyl-1-phenylacetone, 0.2 g of cross-linking agent triethylene glycol diacrylate, 0.05 g of additive polyvinyl alcohol, 0.015 g of additive N-isopropylacrylamide were dissolved in 16 mL of deionized water . The prepared solution is placed in a beaker, exposed under a high-pressure mercury lamp for 15 minutes (ultraviolet light intensity I=10mW / cm 2 ) 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 in a vacuum oven to dry for more than 24 hours to obtain a pH-sensitive hydrogel.

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Abstract

This invention relates to a method to directly synthesize pH sensitive hydrogel by ultraviolet irradiation polymerization, which is attributed to the technology of preparing pH sensitive hydrogel materials. Monomers, cross-linking reagent, additives and photoinitiators are dissolved in deionized water together at certain mass fractions and the solution is irradiated in ultraviolet light for direct cross-linking polymerization into a cross-linking polymer. The cross-linking polymer is dried and pH sensitive hydrogel is obtained. The swelling ability of the hydrogel in aqueous solution changes with pH value and reaches a maximum at the pH value range of 6~8. By varying the species and content of the additives in raw materials, equilibrium swelling coefficient and mechanical strength of the hydrogel can be adjusted for different applications. This invention has the advantages of simple technique, high polymerization efficiency, open operation at room temperature and ambient pressure, no waste liquid pollution and low cost.

Description

technical field [0001] The invention discloses a method for directly synthesizing pH-sensitive hydrogel by ultraviolet radiation polymerization, and belongs to the technical field of preparation methods of pH-sensitive hydrogel materials. 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 hydrogels c...

Claims

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Application Information

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IPC IPC(8): C08F2/46C08F20/06C08F22/06C08F2/10
Inventor 阮维青刘斌王晓工
Owner TSINGHUA UNIV
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