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Preparation method and application of nano-silicon cross-linking agent and quick-response hydrogel

A nano-silicon and cross-linking agent technology, applied in the field of polymer material synthesis, can solve the problems of low hydrogel strength, slow response speed, single structure, etc., and achieve the effect of improving mechanical properties and temperature response rate

Active Publication Date: 2021-04-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively simple structure of the existing cross-linking agents, the hydrogels prepared have low strength and slow response speed, which greatly limits the application of responsive hydrogels.

Method used

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  • Preparation method and application of nano-silicon cross-linking agent and quick-response hydrogel
  • Preparation method and application of nano-silicon cross-linking agent and quick-response hydrogel
  • Preparation method and application of nano-silicon cross-linking agent and quick-response hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A preparation method of nano silicon crosslinking agent, comprising the following steps:

[0048] (1) Take 20 grams of polyethylene glycol monomethyl ether with a molecular weight of 2000, add 110 milliliters of toluene to azeotropically remove water for 2.5 hours, cool to room temperature, add 0.45 grams of sodium hydride, stir at room temperature for 4 hours, add 4 milliliters of epoxy Chloropropane, continue to stir for 12 hours, obtain the crude product by adding n-hexane to precipitate, and dissolve the crude product in dichloromethane, add water to extract three times, add anhydrous sodium sulfate to dry, suction filter, concentrate the solvent, and continue to contain the crude product Use n-hexane precipitation three times to obtain polyethylene glycol monomethyl ether whose end group is epoxy;

[0049] (2) Take 80 ml of ultrapure water and add it to the flask, add 20 ml of KH540 dropwise under vigorous stirring, and after ten minutes, add 25 ml of 0.1M sodium asc...

Embodiment 2

[0053] A kind of preparation method of nano-silicon crosslinking agent, other are with embodiment 1, just use 10 grams of molecular weight in step (1) and be the polyethylene glycol monomethyl ether of 1000.

[0054] The double bond concentration of the nano-silicon crosslinking agent prepared in this embodiment is 1643 g / mol, and the double bond concentration is obtained by bromine titration.

Embodiment 3

[0056] A kind of preparation method of nano-silicon crosslinking agent, other are with embodiment 1, just use 5 grams of molecular weights in step (1) and be the polyethylene glycol monomethyl ether of 500.

[0057] The double bond concentration of the nano-silicon crosslinking agent prepared in this embodiment is 1183 g / mol, and the double bond concentration is obtained by bromine titration.

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Abstract

The invention discloses a preparation method and application of a nano-silicon cross-linking agent and quick-response hydrogel, which comprises the following steps: dispersing epoxy-terminated methoxypolyethylene glycol and amino-containing nano-silicon spheres in ultrapure water, and carrying out stirring reaction, post-treatment and drying to prepare the nano-silicon containing methoxypolyethylene glycol branched chains; and dispersing polyethylene glycol monomethyl ether branched chain-containing nano-silicon and N, N '-methylene bisacrylamide in a mixed solvent, carrying out stirring reaction, post-treatment and drying to obtain a nano-silicon cross-linking agent, and preparing high-strength hydrogel or quick-response hydrogel by using the nano-silicon cross-linking agent as a cross-linking agent. The the prepared hydrogel has high strength or quick response capability. Wide potential application can be realized in the fields of soft brakes, skin sensors and the like.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a preparation method and application of a nano-silicon crosslinking agent and a fast-response hydrogel. Background technique [0002] Hydrogels are a class of flexible materials composed of cross-linked polymers with a hydrophilic three-dimensional network structure and water. The application range can involve wound care, drug delivery, skin sensors, soft robots and other fields. Hydrogels composed of a single network have poor mechanical properties, which limits the application direction of hydrogels. [0003] Acrylamide monomer is a commonly used monomer for making responsive hydrogels. Acrylamide monomers are polymerized in water under the action of initiators and cross-linking agents to obtain responsive hydrogels. Due to the relatively simple structure of the existing cross-linking agents, the hydrogels prepared have low strength and slow response speed, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F222/38C08F285/00C08F220/56C08F220/54C08G83/00
CPCC08F283/00C08F285/00C08G83/001C08F222/385C08F220/56C08F220/54
Inventor 刘春华杨丙梓朱元元
Owner HEFEI UNIV OF TECH
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