Citation: Jian-tao Zhang, Shi-wen Huang, Ya-nan Xue, Ji Liu, Ren-xi Zhuo. THERMAL-SENSITIVE BETA-CYCLODEXTRIN-CONTAINED POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS CROSS-LINKED BY Si―O―Si BONDS[J]. Chinese Journal of Polymer Science, ;2005, 23(5): 513-519. shu

THERMAL-SENSITIVE BETA-CYCLODEXTRIN-CONTAINED POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS CROSS-LINKED BY Si―O―Si BONDS

Corresponding author: Ren-xi Zhuo,
Received Date: 8 October 2004
Revised Date: 20 December 2004

A series of novel p(N-isopropylacrylamide) (PNIPAM) hydrogels were synthesized by radical copolymerization of N-isopropylacrylamide (NIPAM) and 3-methacryloxypropyltrimethoxysilane (MPTMS). The copolymers were then crosslinked through hydrolysis of the siloxane in acetic acid/water mixed solvent. Beta-cyclodextrin (Beta-CD) was introduced into the polymeric networks by condensation of 3-glycidoxypropyltrimethoxysilane derived beta-cyclodextrin (KH560-beta-CD) with MPTMS under acidic condition. These gels were heterogeneous, porous and exhibited fast deswelling kinetics when the temperature was elevated to above lower critical solution temperature (LCST). The swelling ratios of the gels containing beta-CD at room temperature were higher than that of the normal PNIPAM hydrogel, which was caused by the lower crosslinking density in beta-CD contained gels. In comparison to that of the normal PNIPAM gel, the amount of loaded-drug in the hydrogel containing beta-CD was higher, and the release time of 5-fluorouracil (5-Fu) was prolonged, which was attributed to the formation of inclusion compounds between 5-Fu and beta-CD in gel network.
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