The Swelling Equilibria of N-isopropylacrylamide Based Hydrogel in Aqueous Solution of Ethanol  

作　　者：许小平 HüTHER Andreas MAURER Gerd 

机构地区：[1]Department of Chemical Engineering,Fuzhou University,Fuzhou 350002,China [2]Lehrstuhl für Technische Thermodynamik,Universitt Kaiserslautern,Postfach 3049,67663 Kaiserslautern,Germany

出　　处：《Chinese Journal of Chemical Engineering》2003年第3期264-268,共5页中国化学工程学报（英文版）

基　　金：Supported by the Science and Tchnology Ministry of Fujian(No.2001Z046)and the Education Commission of Fujian(No.K2001004).

摘　　要：N-isopropylacrylamide (NIPAAm) was used to synthesize NIPAAm homopolymer (nonionized) and NIPAAm-sodium methacrylate copolymer (ionized). The swelling equilibria for both gels were obtained in aqueous solution of ethanol with concentration ranging from 0 to 100%(by mass) at 25℃. The swollen gel in water shrank first with the addition of a small amount of ethanol and then reswelled with further addition of ethanol showing not only a discontinuous volume phase transition but also a typical reentrant phenomenon. A thermodynamic model based on the UNIQUAC with the 'free-volume' contribution was applied to correlate and predict the swelling behavior of the poly(NIPAAM)-gels in ethanol-water mixture.N-isopropylacrylamide (NIPAAm) was used to synthesize NIPAAm homopolymer (nonionized) and NIPAAm-sodium methacrylate copolymer (ionized). The swelling equilibria for both gels were obtained in aqueous solution of ethanol with concentration ranging from 0 to 100%(by mass) at 25℃ The swollen gel in water shrank first with the addition of a small amount of ethanol and then reswelled with further addition of ethanol showing not only a discontinuous volume phase transition but also a typical reentrant phenomenon. A thermodynamic model based on the UNIQUAC with the 'free-volume' contribution was applied to correlate and predict the swelling behavior of the poly(NIPAAM)-gels in ethanol-water mixture.

关 键 词：HYDROGEL SWELLING poly(N-isopropylacrylamide) model 

分 类 号：O631[理学—高分子化学]