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《Journal of Donghua University,Natural Science》 2005-06
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Preparation and Performance Characterization of pH/Temperature-sensitive Carboxymethylchitosan/Poly(N-isopropylacrylamide) Semi-IPN Hydrogels

SHI Yan-li,XU Ya-jing,ZHANG Gao-qi,MA Jing-hong, LIANG Bo-run(State Key Laboratory for Modification of Chemical Fibers and Polymer, Donghua University,Shanghai,200051)  
A new kind of the semi-IPN hydrogels based on linear carboxymethyl chitosan(CMCS) and cross-linked Poly((N-isopropylacrylamide))((PNIPPAAm)),which exhibited pH and temperature sensitivities,was synthesized.The effect of temperature and pH value on the swelling ratio(SR) of semi-IPN hydrogels was investigated in details.The result indicated that at acidic(pH值为1.0,2.71),weak alkaline (pH值为7.4) and strong alkaline(pH值为9.18) conditions,the SR of the semi-IPN hydrogels decreased with increasing temperature until reaching the equilibrium state.It is notable that the volume phase transmission temperature(VPTT) of the hydrogels was significantly reduced at pH值为2.71. In addition,the deswelling rate increases with increasing CMC content in the semi-IPN hydrogel at a temperature over the VPTT(45()℃).
【CateGory Index】: TQ427.1
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