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Prepn process of nanometer composite aquogel with fast temperature response

A temperature-responsive, nano-composite technology, applied in the field of rapid temperature-responsive nanocomposite hydrogel preparation, can solve problems such as low strength, fragility, and poor mechanical properties, and achieve fast response rate, simple preparation process, and good mechanical properties Effect

Inactive Publication Date: 2007-03-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It must be pointed out that the above-mentioned rapid response PNIPA hydrogels synthesized by adding pore-forming agents are three-dimensional gel networks formed by chemical cross-linking agents such as N,N,-methylenebisacrylamide (BIS), and its mechanical properties Poor performance, low strength, fragile, difficult to meet the needs of practical applications

Method used

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  • Prepn process of nanometer composite aquogel with fast temperature response
  • Prepn process of nanometer composite aquogel with fast temperature response

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Dissolve 1 g of monomer NIPA and 0.198 g of inorganic clay Laponite in 8 ml of deionized water, blow nitrogen, and stir for 60 minutes, then add 0.2 g of sodium carbonate, blow nitrogen, and stir for 10 minutes. Then add 0.01 g of ammonium persulfate and 8 μL catalyst N, N, N', N'-tetramethylethylenediamine, mix well and continue to pass nitrogen for 5 minutes, then quickly pour it into a test tube with a diameter of 18 mm, seal and place After reacting in a water bath at 20°C for 20 hours, the reactants were taken out and cut into sections, immersed in 0.1mol / L hydrochloric acid solution for 2 days, and the hydrochloric acid solution was replaced every 8 hours. Soak in deionized water for 2 days and change the water regularly to obtain a hydrogel with good elasticity and fast shrinkage rate.

[0024] Adopt (Zhang et al. Colloid Polym Sci (2005) 283:431-438) the method disclosed in the literature to detect, the obtained hydrogel has a dehydration rate of 98.5% within 10...

Embodiment 2

[0026] Dissolve 1 g of monomer NIPA and 0.33 g of inorganic clay Laponite in 8 ml of deionized water, blow nitrogen, and stir for 80 minutes, then add 0.2 g of sodium carbonate, blow nitrogen, and stir for 10 minutes. Then add 0.02 g of ammonium persulfate and 8 μL catalyst N, N, N', N'-tetramethylethylenediamine, mix well and continue to pass nitrogen for 5 minutes, then quickly pour it into a test tube with a diameter of 18 mm, seal it After reacting in a water bath at 20°C for 20 hours, the reactants were taken out and cut into sections, immersed in 0.1mol / L hydrochloric acid solution for 2 days, and the hydrochloric acid solution was replaced every 8 hours. Soak in deionized water for 2 days and change the water regularly to obtain a hydrogel with good elasticity and fast shrinkage rate.

[0027] The method disclosed in the literature (Zhang et al. Colloid Polym Sci (2005) 283: 431-438) was used for detection, and the water loss rate of the obtained hydrogel was 93.3% with...

Embodiment 3

[0029] Dissolve 1 g of monomer NIPA and 0.33 g of inorganic clay Laponite in 8 ml of deionized water, blow nitrogen, and stir for 60 minutes, then add 0.6 g of sodium carbonate, blow nitrogen, and stir for 10 minutes. Then add 0.01 g of potassium persulfate and 10 μL of catalyst N, N, N', N'-tetramethylethylenediamine, mix well and continue to pass nitrogen gas for 5 minutes, then quickly pour into a test tube with a diameter of 18 mm, seal and place After reacting in a water bath at 20°C for 20 hours, the reactants were taken out and cut into sections, immersed in 0.1mol / L hydrochloric acid solution for 2 days, and the hydrochloric acid solution was replaced every 8 hours. Soak in deionized water for 2 days and change the water regularly to obtain a hydrogel with good elasticity and fast shrinkage rate.

[0030] The method disclosed in the literature (Zhang et al. Colloid Polym Sci (2005) 283: 431-438) was used for detection, and the water loss rate of the obtained hydrogel w...

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Abstract

The present invention discloses preparation process of nanometer composite aquogel with fast temperature response. The preparation process includes the following steps: dissolving the monomer and inorganic clay in deionized water and stirring under inert atmosphere for 30-120 min; adding pore forming agent and stirring under inert atmosphere for 5-30 min; adding initiator and catalyst and stirring under inert atmosphere for 5-10 min; free radical polymerization at 0-30 deg.c for 10-30 hr; soaking the reaction resultant in 0.1 mol / L concentration hydrochloric acid solution for 48-72 hr and stirring once every 5-8 hr; and soaking the reaction resultant in deionized water until eliminating residual hydrochloric acid to obtain the composite aquogel. The preparation process is simple and the prepared aquogel has fast temperature response and excellent mechanical performance.

Description

technical field [0001] The invention relates to a method for preparing a composite hydrogel, in particular to a method for preparing a rapid temperature response nanometer composite hydrogel. Background technique [0002] Smart hydrogels are currently the most attractive class of hydrogels. Poly N-isopropylacrylamide (PNIPA) hydrogel is a typical representative of this kind of gel. PNIPA hydrogel has a volume phase transition temperature (VPTT, around 32°C). When the ambient temperature is lower than VPTT, PNIPA hydrogel absorbs water and swells; when the ambient temperature is higher than VPTT, PNIPA hydrogel shrinks violently and loses water. . Based on the temperature-sensitive nature of PNIPA hydrogel, it has been applied in the fields of controlled release of drugs, immobilization of enzymes and circulating absorbents. [0003] However, the traditional PNIPA hydrogel has disadvantages such as poor mechanical properties, fragility, inability to stretch, slow response ...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08F120/56C08F4/28C08L33/26C08K3/34
Inventor 马敬红李珍梁伯润
Owner DONGHUA UNIV
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