Abstract: N-Isopropylmethacrylamide(NIPM) was prepared from methacrylonitrile and isopropanol,The polymeization of NIPM in different solvents using ammonium persulfate-N,N,N',N'-tetramethylethylene diamine as the initiator and N,N'-methylene-bisacrylamide as crosslinking agent has been studied.The results show that the hydrogels from NLPM-MBAor NIPM-MBA-ionic monomers possesses thermosensitive properties.The swelling ratios of hydrogels at different temperatures were determined

Key words: N-Isopropylmethacrylamide, Thermosensitive hydrogel, Anionic thermosensitive hydrogel