中文摘要：

以聚偏氟乙烯（PVDF）为基材,分别采用直接引发原子转移自由基聚合（ATRP）和碱处理后自由基聚合的方法接枝N-异丙基丙烯酰胺（NIPAAm）,合成出不同接枝率的PVDF-g-PNIPAAm共聚物,然后用相转化法制备出PVDF-g-PNIPAAm共聚温敏膜。用核磁共振（1 H NMR）和X射线光电子能谱（XPS）分别对共聚物和共聚膜的化学组成进行了表征,用压汞仪测试了膜的孔结构。结果表明,与ATRP法相比,碱处理法能得到更高接枝率的产物。通过不同温度下牛血清蛋白（BSA）截留率研究膜的温度敏感行为,发现共聚膜的温敏行为受PNIPAAm接枝率影响,AT-RP法和碱处理法制备的共聚膜的温敏行为相反。

英文摘要：

The poly（vinylidene fluoride）-g-poly（N-isopropylacrylamide）（PVDF-g-PNIPAAm） copolymers with different graft ratio were synthesized via grafting NIPAAm onto PVDF substrate using atom transfer radical polymerization（ATRP） and radical polymerization of alkali treated PVDF,respectively.The graft copolymers were cast by phase inversion into PVDF-g-PNIPAAm temperature sensitive membranes.The chemical structures of the graft copolymers and membranes were characterized,respectively,by 1H NMR and X-ray photoelectron spectroscopy（XPS）.The pore structure of the copolymer membranes were measured using mercury injection apparatus.In comparison with ATRP method,the graft ratio of the copolymer synthesized by alkali treatment method was higher.The effect of temperature on the rejection ratio of bovine serum albumen（BSA） was investigated.The results showed that the temperature sensitivity of the copolymer membranes was controlled by the graft ratio of PNIPAAm.The temperature sensitivity of the PVDF-g-PNIPAAm membrane prepared by ATRP method was opposite to that of alkali treatment method.