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Citation: CHEN Zhao-Wei, CHEN Ming-Qing, LIU Xiao-Ya, YANG Cheng. Preparation of Fast-Response pH-Sensitive PNIPAAm-co-PAAc Hydrogels and Their Swelling Kinetics[J]. Chinese Journal of Applied Chemistry, ;2004, 21(9): 884-889. shu

Preparation of Fast-Response pH-Sensitive PNIPAAm-co-PAAc Hydrogels and Their Swelling Kinetics

1.
School of Chemistry and Material Engineering, Jiangnan University, Wuxi 214036

Corresponding author: CHEN Ming-Qing,
Received Date: 31 October 2003
Available Online: 19 April 2004
Fund Project: 教育部留学回国启动(教留司2000-237) (教留司2000-237)江苏省十五科技攻关(BE2002239)资助项目 (BE2002239)

A series of porous PNIPAAm-co-PAAc hydrogels were synthesized by radical copolymerization of (N-isopropylacrylamide)(NIPAAm) and acrylic acid(AAc) using silica particles as a porogent. The dynamic swelling kinetics of the hydrogels pretreated in different buffer solutions have been studied. Experimental results revealed that the swelling rate of the porous hydrogels greatly increased in comparison with nonporous hydrogels due to their porous structure. And although the previous treatment did not affect the equilibrium swelling degree of copolymer hydrogels, a strong influence on their dynamic swelling kinetics was still observed especially for the copolymers with composition of NIPAAm between 30% and 70% mole fraction. When subsequently soaked in a neutral solution with pH=7, these copolymer samples exhibited sigmoidal swelling curves by an autoacceleration mechanism. The dynamic swelling of the copolymer and homopolymer hydrogels at pH=7 after soaking in a solution of the same pH can be described by second-order kinetics.
- N-isopropylacrylamide,
- hydrogel,
- fast-response,
- pH-sensitive,
- swelling history,
- swelling kinetic
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