Preparation and characterization of N-isopropylacrylamide/carboxymethylated chitosan hydrogel  

作　　者：杨黎明 陈捷 王胜 

机构地区：[1]Department of Chemical Engineering and Technology,School of Environmental and Chemical Engineering,Shanghai University

出　　处：《Journal of Shanghai University(English Edition)》2010年第2期106-110,共5页上海大学学报（英文版）

基　　金：supported by the Shanghai Nano-material Project Foundation (Grant No.0452NM024);the Shanghai Leading Academic Discipline Project (Grant No.T0105)

摘　　要：Poly （N-isopropylacrylamide） （PNIPAAm）/carboxymethylated chitosan （CMCH） hydrogels were prepared by irradiating the aqueous solution mixture of NIPAAm and CMCH by 60 Co γ-ray.The effects of feed ratio of NIPAAm and CMCH,temperature,pH and ionic strength on the swelling ratio of PNIPAAm/CMCH hydrogels were studied.The results show that the addition of CMCH shifts the lower critical solution temperature （LCST） of the PNIPAAm hydrogel to higher temperature.The PNIPAAm/CMCH hydrogel displays not only pH-and thermo-sensitivity,but also ion-sensitivity.Differential scanning calorimetry （DSC） was applied for the determination of the LCST of the hydrogel.Poly （N-isopropylacrylamide） （PNIPAAm）/carboxymethylated chitosan （CMCH） hydrogels were prepared by irradiating the aqueous solution mixture of NIPAAm and CMCH by 60 Co γ-ray.The effects of feed ratio of NIPAAm and CMCH,temperature,pH and ionic strength on the swelling ratio of PNIPAAm/CMCH hydrogels were studied.The results show that the addition of CMCH shifts the lower critical solution temperature （LCST） of the PNIPAAm hydrogel to higher temperature.The PNIPAAm/CMCH hydrogel displays not only pH-and thermo-sensitivity,but also ion-sensitivity.Differential scanning calorimetry （DSC） was applied for the determination of the LCST of the hydrogel.

关 键 词：carboxymethylated chitosan （CMCH） N-isopropylacrylamide （NIPAAm） hydrogel temperature-sensitive pH-sensitive 

分 类 号：O636.1[理学—高分子化学]