Preparation of pH sensitive poly(acrylic acid-co-acrylamide) ”P(Aac-co-AM)” macroporous hydrogels in aqueous NaCl solutions and their characterization
In this study, pH sensitive poly (acrylic acid-co-acrylamide) ”P(AAc-co-AM)” macroporous hydrogels hydrogels were successfully prepared by enhanced phase separation in the presence of 0.3,0.5 and 0.7mol/L aqueous sodium chloride (NaGl) solutions.The chemical compositions and structures of different hydrogels were similar, as measured by Fourier transform infrared spectroscopy (FT-IR).Analysis of the scanning electron microscopy (SEM) showed that the pore morphologies of these hydrogels were dependent on the concentration of NaCl and more macropores were observed in the samples prepared with higher NaCl concentration.Swelling studies showed an increase in equilibrium swelling ratio in distilled water as the NaCl concentration in the polymerization medium increased from 0 to 0.7mol/L.The P(AAc-co-AM) hydrogels exhibited stronger sensitivity to pH and ionic strength(Ⅰ), and showed much faster reswelling and deswelling response rates in the more NaCl concentration.These data implied that the addition of NaCl to the polymerization medium produced heterogeneous macroporous hydrogels of controlled morphology during the polymerizations.
poly(acrylic acid-co-acrylamide) phase separation macroporous pH sensitivity
Yuhua Xue Wenyuan Zhao Nianhua Guo Zhi Liu Mingsheng Bu Li Wang Runqi Ruan Wei Wang
Marine Chemicals Research Institute Co., Ltd.Qingdao 266071, China Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
国内会议
青岛
英文
79-88
2014-09-01（万方平台首次上网日期，不代表论文的发表时间）