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Citation: QIN Ai-Xiang, LU Man-Geng, LIU Qun-Feng, ZHANG Ping. Synthesis and Characterization of Thermo-sensitive Poly(N-isopropylacrylamide) Hydrogel with Fast Response Rate[J]. Chinese Journal of Applied Chemistry, ;2006, 23(6): 581-585. shu

Synthesis and Characterization of Thermo-sensitive Poly(N-isopropylacrylamide) Hydrogel with Fast Response Rate

QIN Ai-Xiang ^a,b ,
LU Man-Geng ^a,, ,
LIU Qun-Feng ^a,b ,
ZHANG Ping ^a,b

1.
a Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 501650;
2.
b Graduate School of Chinese Academy of Sciences, Beijing

Corresponding author: LU Man-Geng,
Received Date: 28 July 2005
Available Online: 18 October 2005
Fund Project:

Thermo-sensitive poly(N-isopropylacrylamide)(PNIPA) hydrogel with a fast response rate was prepared by polymerization in aqueous solution of hydroxypropyl-methyl cellulose.The volume phase transition temperature of the PNIPA hydrogels was characterized by differential scanning calorimetry.The surface morphology of the PNIPA hydrogels was studied by scanning electron microscopy.The swelling ratios of the hydrogels at different temperatures were measured.Furthermore,the deswelling kinetics of the hydrogels was studied.In comparision with a conventional PNIPA hydrogel prepared in water,the hydrogel synthesized in hydroxypropyl-methyl cellulose aqueous solution has higher swelling ratios at temperatures below the lower critical solution temperature and exhibits a much faster response rate to temperature changes.For example,the hydrogel prepared in hydroxypropyl-methyl cellulose aqueous solution loses 89% water within 1min and about 93% water within 4 min,whereas the conventional hydrogel loses only about 66% water within 15 min.
- N-isopropylacrylamide,
- hydrogel,
- thermo-sensitive,
- fast response
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