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
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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. Th

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process of directly synthetizing pH sensitive aquagel polymerized by UV radiation

Examples

Experimental program
Comparison scheme
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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08F2/46C08F20/06C08F22/06C08F2/10
Inventor 阮维青刘斌王晓工
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap