Preparation of Poly(N-isopropylacrylamide) Hydrogel and Its Thermally Induced Aggregation Behavior
HU Yaoqiang1,2, CHEN Fajin1, LIU Haining2,3, ZHANG Huifang2,3, WU Zhijian2,3, YE Xiushen2,3
1 College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088; 2 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Chinese Academy of Sciences, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008; 3 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008
Abstract: The PNIPAM hydrogels were prepared by emulsifier-free emulsion polymerization method, using NIPAM as monomer, MBA as crosslinking agent and KPS as initiator. Morphology and molecular structure of PNIPAM were examined by SEM and FTIR measurements. The influences of polymerization time, temperature, concentration, pH, coexisted NaCl and MgCl2 on the thermally induced aggregation behavior were comprehensively investigated. The results indicated that this method is simple and easy to operate, and the obtained hydrogel has an obvious thermal-responsive effect. Its thermally induced aggregation behavior becomes more significant with the extension of polymerization time. The thermally induced aggregation behavior of PNIPAM becomes more obvious with the increase of polymerization time, PNIPAM concentration and coexisted salt concentration, or the decrease of pH.
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2018, Vol. 32 
