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Process for preparing quick response temperature sensitive water gel

A temperature-sensitive hydrogel, fast-response technology, applied in the field of functional polymers, can solve the problems of high performance requirements of porogens, difficult to control heterogeneous structure, difficult to control reaction process, etc., to improve the de-swelling kinetics Chemical performance, fast dehydration performance, fast response rate

Inactive Publication Date: 2008-01-02
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, WuXS et al. [WuXS, Hoffman AS, Paul Y.J Polym Sci, Part A: Polym Chem, 1992, 30: 2121-2129] proposed to introduce porous or superporous structures into hydrogels, and they used hydroxypropyl cellulose A macroporous PNIPAM hydrogel was synthesized as a pore-forming agent at a temperature higher than the lower critical temperature, but this method has high requirements on the performance of the pore-forming agent, and the process is complicated, and the pore-forming agent needs to be extracted in the subsequent process
Yoshida et al. [Yoshida R, Uchida U, Kaneko Y, et al. Nature, 1995, 374: 240-242] proposed to introduce grafted chains into the hydrogel, but this method is complex and requires multi-step synthesis. It is difficult to apply in the actual production process
Zhang et al. [Zhang X Z, Zhang J T, Zhuo R X, et al. Polymer, 2002, 43: 4823-4827] proposed to use phase separation technology, that is, to use water / tetrahydrofuran as a mixed solvent to form a copolymer in PNIPAM hydrogel through a copolymerization reaction. A crown ether derivative: 4'-allyldibenzo-18-crown-6 (CE) was introduced by valent way, but this heterogeneous structure is difficult to control
Zhibing Hu et al [Hu Z., Lu X, Gao J, Wang C. Advanced Materials 2000; 12: 173] first prepared nanoparticles with functional groups, and then connected these particles through chemical bonds to prepare a Nanocomposite hydrogels, but the reaction process of this method is difficult to control

Method used

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  • Process for preparing quick response temperature sensitive water gel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 1 g of ethanethiol in 20 g of 1,4-dioxane solution, then add 3 g of N-isopropylacrylamide, 0.13 g of N, N-methylenebisacrylamide, azobisisobutyl Nitrile 1g. Put the above raw materials into the reactor, evacuate to remove oxygen, then fill with nitrogen and seal, react at 40°C for 6 hours to obtain a gel; then soak the obtained gel in deionized water at room temperature for 2 days, Change the water once a day to remove the residual monomers and cross-linking agents in the gel to obtain the desired temperature-sensitive hydrogel.

[0022] The deswelling kinetics of the hydrogel was measured gravimetrically, and the hydrogel showed accelerated deswelling kinetics.

Embodiment 2

[0024] Dissolve 0.5g of dodecanethiol in 20g of 1,4-dioxane solution, then add 2g of N-isopropylacrylamide, 1g of N,N-methylenebisacrylamide, azobisiso Nitrile 0,5 g. Put the above raw materials into the reactor, vacuum to remove oxygen, then fill with nitrogen and seal, react at 80°C for 48 hours to obtain a gel; then soak the obtained gel in deionized water at room temperature for 8 days, Change the water once a day to remove the residual monomers and cross-linking agents in the gel to obtain the desired temperature-sensitive hydrogel.

[0025] The deswelling kinetics of the hydrogel was measured gravimetrically, and the hydrogel showed accelerated deswelling kinetics.

Embodiment 3

[0027] First dissolve 0.1g of dithiobenzoic acid in 20g of 1,4-dioxane solution, then add 7g of N-isopropylacrylamide, 2g of N,N-methylenebisacrylamide, azobis Isobutyronitrile 0.04g. Put the above raw materials into the reactor, evacuate to remove oxygen, then fill with nitrogen and seal, react at 55°C for 16 hours to obtain a gel; then soak the obtained gel in deionized water for 4 days at room temperature, Change the water once a day to remove the residual monomers and cross-linking agents in the gel to obtain the desired temperature-sensitive hydrogel.

[0028] The deswelling kinetics of the hydrogel was measured gravimetrically, and the hydrogel showed accelerated deswelling kinetics.

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Abstract

The present invention discloses preparation process of quick response temperature sensitive water gel. Monomer N-isopropyl acrylamide, cross-linking agenet N, N-methylene bisacrylamide, initiator azo diisobutyronitrile, chain transferring agent, solvent 1, 4-dioxane and other reaction materials are made to react at 40-80 deg.c in a container first vacuumized and then filled with nitrogen for 6-48 hr to obtain gel, which is then soaked in water to eliminate residual reaction materials so as to obtain the quick response temperature sensitive water gel. The quick response temperature sensitive water gel of the present invention has quick response rate, fast dewatering performance and simple preparation process.

Description

technical field [0001] The invention relates to the field of functional polymers, in particular to a method for preparing a fast-response temperature-sensitive hydrogel. Background technique [0002] Thermosensitive hydrogels, especially poly-N-isopropylacrylamide (PNIPAM) hydrogels, are currently the most widely studied smart hydrogels. When the temperature is higher or lower than the lower critical solution temperature (LCST) value of PNIPAM hydrogel, PNIPAM hydrogel is in shrinkage or swelling state respectively, meanwhile, the interaction parameter of this hydrogel, modulus, refractive index, The dielectric constant, optical anisotropy, etc. will also change abruptly, and these changes are often reversible. The mutated characteristics of PNIPAM hydrogel with the change of environmental temperature make it have good application prospects, and can be used in the fields of immobilized enzymes, material extraction, cell culture, temperature-sensitive switches, especially th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F20/56C08F4/04C08F4/38
Inventor 刘群峰吕满庚张平秦爱香
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI