In this study, poly ( N-isopropylacrylamide) / chitosan ( PNIPAAm / CS) compos-ite membranes were fabricated, in which PNIPAAm was directly synthesized using NIPAAm monomers by means of free radical polymerization. Fourier transform infrared ( FT-IR) spec-troscopy was employed to characterize the membranes and the interactions. The lower critical so-lution temperature ( LCST ) of the swollen membrane was determined by differential scanning calorimetry ( DSC) . The morphologies of the obtained membranes were observed using scanning electron microscopy ( SEM) . The results showed that the composite membrane had good thermo-responsive performance. The construction of membrane became more regular with the increas-ing of CS. The hydrogen bondings have been formed between the two compositions of CS and PNIPAAm. Obvious phase conversion and shape change of the composite membrane have oc-curred below and above the LCST, which enhanced the mechanical properties of the composite menbrance . The results also showed that water absorption and mechanical properties of the men-brane were also affected by the PNIPAAm content.%通过自由基聚合法以单体N-异丙基丙烯酰胺( NIPAAm)和壳聚糖( CS)为原料反应制得聚N-异丙基丙烯酰胺/壳聚糖(PNIPAAm/CS)多孔温敏复合膜。用扫描电子显微镜(SEM)、傅立叶红外光谱( FTIR)、差热分析( DSC)和溶胀率等研究手段对复合膜的理化性能进行表征。研究结果表明:复合膜仍保持其良好的温度敏感性;膜结构随CS含量增加而变得规则,孔径变小,机械性能增强,同时相转变温度略有下降;复合膜内两相间分布比较均匀,未出现相分离;PNIPAAm与CS两相间存在一定的键合作用,主要是CS的羟基和氨基与PNIPAAm中的酰胺基之间形成了氢键结合,这些作用对复合膜的力学性能有一定增强作用。研究还发现,PNIPAAm含量对膜的吸水率和力学性能亦有一定影响。
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