Synthesis and Characterization of Polyitaconic Acid/ Poly N-isopropyl Acrylamide Interpenetrating Polymer Network HydrogelWU Li-li(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)Polyitaconic acid/ Poly N-isopropyl acrylamide interpenetrating polymer network hydrogel was synthesized.From study of swelling ratios of the hydrogel in different conditions,it was found that the hydrogel displayed obvious contraction characteristic in 25~45 ℃ temperature ranges and its swelling ratio increased as the pH rise.The hydrogel had temperature and pH-sensitive character.polyitaconic acid;poly N-isopropyl acrylamide;IPN hydrogel;environmental sensitive