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Preparation method of photosensitive hydrogel

A hydrogel and photosensitivity technology, applied in the field of intelligent polymer materials and intelligent polymer hydrogels, can solve the problems of large differences in product properties, difficult product molecular weight and molecular weight distribution, and insufficient light responsiveness. Achieving the effect of good responsiveness, easy control, and simple preparation method

Inactive Publication Date: 2012-06-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method of copolymerization or homopolymerization is difficult to control the molecular weight and molecular weight distribution of the obtained product, and the properties of the obtained product vary greatly, and the photoresponsiveness is not obvious enough.

Method used

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  • Preparation method of photosensitive hydrogel
  • Preparation method of photosensitive hydrogel
  • Preparation method of photosensitive hydrogel

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Step a: According to the mass ratio of polyacrylic acid and N-methyl-2-pyrrolidone is 1:25, polyacrylic acid is dissolved in N-methyl-2-pyrrolidone at 60 ° C, and then p-aminoazobenzene is The mass ratio of polyacrylic acid is 0.2:1, and the dehydrating agent biscyclohexylcarbimide is added according to the molar ratio of p-aminoazobenzene and biscyclohexylcarbimide at 1:1, and the reaction is stirred at 60°C for 48 hours. Add 30% sodium hydroxide aqueous solution to the reacted substance according to the volume ratio of sodium hydroxide aqueous solution and N-methyl-2-pyrrolidone as 1:1, and precipitate after stirring, and filter the solid with 60°C N -Methyl-2-pyrrolidone was washed twice, and the amount used was the same as the volume of the aqueous sodium hydroxide solution. The obtained solid was washed 3 times with methanol, dissolved in deionized water, dialyzed with deionized water, and freeze-dried to obtain the target product azobenzene-modified polyacrylic ac...

Embodiment 2

[0029] Step a: Dissolve polyacrylic acid in N-methyl-2-pyrrolidone at 65°C at a mass ratio of polyacrylic acid to N-methyl-2-pyrrolidone of 1:30, and then add p-aminoazobenzene to The mass ratio of polyacrylic acid is 0.3:1, and the dehydrating agent biscyclohexylcarbimide is added according to the molar ratio of p-aminoazobenzene and biscyclohexylcarbimide at 1:1.1, and the reaction is stirred at 65°C for 72 hours. Add 35% aqueous sodium hydroxide solution to the reacted substance according to the volume ratio of aqueous sodium hydroxide solution to N-methyl-2-pyrrolidone at 1.2:1, and precipitate after stirring, and filter the solid with 65°C N -Methyl-2-pyrrolidone was washed 3 times, and the amount used was the same as the volume of the aqueous sodium hydroxide solution. The obtained solid was washed twice with methanol, dissolved in deionized water, dialyzed with deionized water, and freeze-dried to obtain the target product azobenzene-modified polyacrylic acid.

[0030]...

Embodiment 3

[0033] Step a: dissolving polyacrylic acid in N-methyl-2-pyrrolidone at 70°C at a mass ratio of polyacrylic acid to N-methyl-2-pyrrolidone is 1:35, and then p-aminoazobenzene is The mass ratio of polyacrylic acid is 0.5:1, and the dehydrating agent biscyclohexylcarbimide is added according to the molar ratio of p-aminoazobenzene and biscyclohexylcarbimide as 1:1.2, and the reaction is stirred at 70°C for 96 hours. Add 35% sodium hydroxide aqueous solution to the reacted substance according to the volume ratio of sodium hydroxide aqueous solution and N-methyl-2-pyrrolidone as 1.2:1, after stirring, precipitate is obtained, and after suction filtration, the solid is washed with 70 ° C N -Methyl-2-pyrrolidone was washed twice, and the amount used was the same as the volume of the aqueous sodium hydroxide solution. The obtained solid was washed three times with methanol, dissolved in deionized water, dialyzed with deionized water, and freeze-dried to obtain the target product azob...

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Abstract

The invention discloses a preparation method of photosensitive hydrogel. The method comprises 3 steps that: 1, modified cyclodextrin is subject to a reaction with polyacrylic acid, such that cyclodextrin-modified polyacrylic acid is obtained; 2, azobenzene substituted by monoamino is subject to a reaction with polyacrylic acid, such that azobenzene-modified polyacrylic acid is synthesized; and 3, the two polymers are mixed, such that the photosensitive hydrogel is obtained. When the photosensitive hydrogel is irradiated by using ultraviolet light with a certain wavelength, the viscosity of the photosensitive hydrogel is substantially reduced, and the photosensitive hydrogel turns into a movable solution. When irradiation is stopped, a gel state is recovered. The photosensitive hydrogel can be used for preparing light-controlled motors and light-controlled switches. The photosensitive hydrogel can also be used in light-controlled drug-releasing.

Description

technical field [0001] The invention relates to an intelligent polymer material technology, specifically a light-responsive intelligent polymer hydrogel, that is, under the irradiation of a certain wavelength of ultraviolet light, the viscosity is significantly reduced and becomes a flowable solution, and the light is stopped Afterwards, it can completely return to the original gel state, and belongs to the technical field of new materials. Background technique [0002] Smart hydrogels are hydrophilic polymers with a three-dimensional network structure that can respond significantly to small changes or stimuli in the external environment (such as temperature, pH value, electricity, light, magnetic field, specific biomolecules, etc.). , chemical separation, chemical sensors and catalysts have broad application prospects. Molecules with photoreversible isomerization characteristics will undergo conformational changes under light irradiation, such as azobenzene and its derivat...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L87/00C08L33/02C08F20/06C08F8/32
Inventor 李莉郭旭虹王杰张晓君涂学敏王铭纬董晓蕾房鼎业
Owner EAST CHINA UNIV OF SCI & TECH
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