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Preparation for smart water gel responding microwave

A hydrogel and microwave technology, applied in the direction of coating, etc., can solve the problems of weak light penetration ability and limited application range of photosensitive hydrogel, and achieve the effect of good transparency

Inactive Publication Date: 2009-02-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Judging from the principle and related reports, the magnetically sensitive hydrogel requires a huge alternating magnetic field generator, and at the same time, the hydrogel needs to be placed in the middle of the alternating magnetic field to achieve the effect; It is necessary to place the electrolyte gel in some kind of electrolyte solution and add electrodes to respond to electrical stimulation; due to the weak light penetration ability of photosensitive hydrogel, it can only be carried out in transparent systems, so the application of photosensitive hydrogel limited range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The processing steps of the present embodiment are as follows:

[0014] (1) Using MnO 2 As microwave thermoresponsive medium microspheres, the MnO was first washed with double distilled water 2 , so that the surface is fully wetted;

[0015] (2) N-isopropylacrylamide (NIPAAm) is used as a heat-sensitive polymer monomer, and it is made into an aqueous solution, and its weight concentration is 10%;

[0016] (3) Add MnO to the above solution 2 Medium microspheres, the amount of microspheres added is 1 times the weight of the monomer, that is, the same amount; the medium microspheres are fully mixed with the heat-sensitive monomer by high-speed stirring;

[0017] (4) Put the above-mentioned mixed solution into a four-necked reaction flask, add initiator potassium persulfate, and add 3% of the weight of heat-sensitive monomer NIPAAm to potassium persulfate; feed nitrogen, stir and heat, and react at a temperature of 71°C 4 hours; after the end of the polymerization react...

Embodiment 2

[0021] The process step of the present embodiment is substantially identical with the above-mentioned embodiment 1, and difference is the (6) step in the above-mentioned embodiment 1; This step is described as follows in the present embodiment:

[0022] Pour the above mixture into a mold, and irradiate and polymerize with electron beams or Co-60γ-rays; the irradiation dose of electron beams is 50KGy, and the irradiation dose of Co-60γ-rays is 25KGy, and finally microwave-responsive smart water is obtained. gel.

[0023] In each of the above examples, the finally obtained hydrogel needs to be washed alternately and repeatedly with cold and hot distilled water to remove unreacted monomers.

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Abstract

The invention relates to a manufacture method for intelligent hydrogel of microwave responding. It would expand and contract under the effect of external microwave. The method includes the following steps: adopting high polymer compounding technology and radiating process technology, taking pre-polymerizing of microwave heat responding medium micro-balloon and heat sensitive monomer to form a polymer on the surface of medium micro-balloon; taking heat chemical and radiation cross linking method to make medium micro-balloon disperse in hydrogel to gain the microwave responding intelligent hydrogel material.

Description

technical field [0001] The invention relates to a preparation method of a microwave-responsive intelligent hydrogel, which belongs to the technical field of intelligent hydrogel new materials. Background technique [0002] In recent years, smart hydrogels and their preparation technologies have become a hot topic in the research of new materials. There have been a large number of research reports on hydrogels that are thermally sensitive, acid sensitive, electrosensitive, photosensitive, and magnetic sensitive. Regarding microwave-sensitive hydrogels, there have been no reports of relevant experimental results so far. Judging from the principle and related reports, the magnetically sensitive hydrogel requires a huge alternating magnetic field generator, and at the same time, the hydrogel needs to be placed in the middle of the alternating magnetic field to achieve the effect; It is necessary to place the electrolyte gel in some kind of electrolyte solution and add electrode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F2/44C08F8/00C08J7/04B29C35/08
Inventor 陈捷孙婕杨黎明邬慧凤戎亮
Owner SHANGHAI UNIV
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