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Self-repaired hydrogel and preparation method thereof

A hydrogel and self-healing technology, applied in the field of intelligent polymer materials, can solve the problems of high preparation cost, high price, and unproposed material repair ability, so as to reduce preparation cost, realize precise control and remote control, and realize remote The effect of control

Active Publication Date: 2017-05-10
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chen et al. used cyclodextrin polymers and bromonaphthalene-containing polymers to prepare self-healing gels, but did not propose a method for regulating the repair ability of materials (H.Chen, X.Ma, S.Wu, H. .Tian,Angew.Chem.Int.Ed.2014,53,14149)
In addition, the above studies, for the preparation of polymers containing cyclodextrin, all use expensive aminocyclodextrin as the precursor, and the preparation cost is relatively high.

Method used

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  • Self-repaired hydrogel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030]50 parts by mass of β-cyclodextrin and 30 parts by mass of NaOH were added to 100 parts by mass of water, and stirred at room temperature until a clear solution was obtained. The solution was heated and kept at 30° C., and then 30 parts by mass of epichlorohydrin was quickly added to react under constant temperature stirring. The reaction process was monitored, and when the solution became viscous after 4 hours of reaction, 50 parts by mass of acetone solution was added to terminate the reaction, and the acetone was removed with a rotary evaporator. Then use hydrochloric acid (6mol / ml) to adjust the pH of the solution to 10 and dialyze (dialysis bag molecular weight cut-off 3000), remove unreacted cyclodextrin, sodium hydroxide and epichlorohydrin, and dialyze for a week to obtain cyclodextrin- Epichlorohydrin copolymer solution, and then add 2 parts by mass of azobenzeneacrylamide to the cyclodextrin-epichlorohydrin copolymer solution, and stir and react at 20°C for 5h ...

Embodiment 2

[0034] Add 60 parts by mass of β-cyclodextrin and 40 parts by mass of NaOH to 100 parts by mass of water, stir at room temperature until it becomes a clear solution, heat the solution at a constant temperature of 30°C, and then quickly add 40 parts by mass of epoxy Chloropropane reacted under stirring at constant temperature. Monitor the reaction process, add 100 mL of acetone solution when the solution becomes thick after 2 hours of reaction, and stir for 3 minutes to terminate the reaction, and remove the acetone with a rotary evaporator. Then use hydrochloric acid (6mol / ml) to adjust the pH of the solution to 10 and dialyze (dialysis bag molecular weight cut-off 3000), remove unreacted cyclodextrin, sodium hydroxide and epichlorohydrin, and dialyze for a week to obtain cyclodextrin- Epichlorohydrin copolymer solution, and then add 4 parts by mass of azophenylacrylamide to the cyclodextrin-epichlorohydrin copolymer solution, and stir and react at 25°C for 24h until the solut...

Embodiment 3

[0038] Add 80 parts by mass of β-cyclodextrin and 60 parts by mass of NaOH to 100 parts by mass of water, stir at room temperature until it becomes a clear solution, heat the solution at a constant temperature of 20°C, and then quickly add 60 parts by mass of epoxy chlorine Propane reacted under constant temperature stirring. Monitor the reaction process, add 150 parts by mass of acetone solution when the solution becomes viscous after 0.5 hours of reaction, and stir for 5 minutes to terminate the reaction, and remove the acetone with a rotary evaporator. Then use hydrochloric acid (6mol / ml) to adjust the pH of the solution to 10 and dialyze (dialysis bag molecular weight cut-off 3000), remove unreacted cyclodextrin, sodium hydroxide and epichlorohydrin, and dialyze for a week to obtain cyclodextrin- Epichlorohydrin copolymer solution, and then add 6 parts by mass of azobenzeneacrylamide to the cyclodextrin-epichlorohydrin copolymer solution, and stir and react at 50° C. for 4...

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Abstract

The invention provides a self-repaired hydrogel and a preparation method thereof. A copolymer of cyclodextrin and epoxy chloropropane and azophenyl acrylamide are subjected to a host-guest complexing effect to obtain a crosslinking agent; and the crosslinking agent is copolymerized with water-soluble monomers such as acrylamide to obtain a hydrogel material. After the material is damaged, the fracture surfaces of the material are repaired through the host-guest complexing effect between trans-azobenzene and cyclodextrin; by applying ultraviolet irradiation to the fracture surfaces of the material, the azobenzene group is turned into a cis form, and the self-repairing ability disappears; and by applying blue light irradiation to the fracture surfaces of the material, the azobenzene group is turned into a trans form, and the self-repairing ability recovers. The material provided by the invention is hopefully applied to the fields such as drug release, optical storage, optical switches and anti-forgery technology.

Description

technical field [0001] The invention relates to the technical field of intelligent polymer materials, in particular to a self-repairing hydrogel and a preparation method thereof. Specifically, it is a self-healing hydrogel using a complex of a water-soluble monomer and a cyclodextrin-epichlorohydrin copolymer as a crosslinking agent, and the self-healing ability of the gel can be adjusted by light. Background technique [0002] Self-healing polymers refer to a class of polymer materials that can self-judge, control and recover their own defects, cracks and damages. Such materials show broad application prospects in the fields of packaging, coatings, aerospace and biomedicine . The control of repair efficiency is the key technology of self-healing polymer materials, which will improve the function of materials and expand the application prospects of materials. [0003] Host-guest interaction is a supramolecular interaction between host molecules and guest molecules, which h...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F220/54C08F226/02C08F220/06C08F220/28C08B37/16
CPCC08B37/0015C08F251/00C08F220/281
Inventor 杨巧凤赵传壮王平张利王文钦
Owner NINGBO UNIV
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