Preparation and Swelling Behaviors of Rapid Responsive Semi-IPN NaCMC/PNIPAm Hydrogels

作     者：易国斌 

作者机构：Faculty of Chemical Engineering and Light IndustryGuangdong University of Technology 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2011年第26卷第6期

页      面：1073-1078页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：Funded by the National Natural Science Foundation of China(50973129) the Natural Science Found of Guangdong Province(07001781) the Open Project of Key Laboratory of Cellulose and Lignocellulosics Chemistry Chinese Academy of Science(LCLC-2005-168) 

主　　题：sodium carboxylmethylcellulose(NaCMC) N-isopropyl acrylamide(NIPAm) semi-IPN hydrgels characterization 

摘      要：Semi-interpenetrating network（semi-IPN） hydrogels composed of sodium carboxylmethylcellulose（NaCMC） and poly N-isopropylacrylamide（PNIPAm） were prepared by free radical polymerization of N-isopropyl acrylamide（NIPAm） in dimethylsulfoxide（DMSO） in the presence of NaCMC. The structures of hydrogels were characterized by Fourier transform infrared spectroscopy（FTIR）, scanning electron microscopy（SEM） and differential scanning calorimetry（DSC）. SEM images show that the hydrogels present porous network structures. Most water in the hydrogels were free water and freezing water. The equilibrium swelling ratio（ESR） and swelling rate（SR） were quite different at various swelling temperature. ESR of the hydrogels ranged abruptly from 15.2 g/g to 1.56 g/g and the hydrogels changed from transparent into opaque with swelling temperature changing from 33 ℃ to 34 ℃, that is to say, the hydrogels exhibited the good temperature sensitivity at about 33 ℃ similar to low critical solution temperature（LCST） of pure PNIPAm, swelling rate were very different at below and above LCST due to hydrogel swelling with different swelling mechanism. Moreover, the semi-IPN hydrogels swelled much rapidly than pure PNIPAm hydrogels did at room temperature, the equillibrium swelling ratio（ESR） and swelling rate of the hydrogels increased with increasing of NaCMC content, i e. It is suggested that NaCMC could be potential for preparation of porous and rapid swelling hydrogels