聚N-异丙基丙烯酰胺接枝核孔膜微观结构及温敏响应特性  

Microstructures and thermo-responsive characteristics of poly(N-isopropylacrylamide)-grafted polycarbonate track-etched membranes prepared by plasma-graft pore-filling polymerization

作　　者：谢锐[1] 褚良银[1] 陈文梅[1] 肖文[1] 王海东[1] 曲剑波[1] 王广金[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《化工学报》2005年第11期2212-2218,共7页CIESC Journal

基　　金：国家自然科学基金(50373029);教育部跨世纪优秀人才基金(教技函[2002]48号);霍英东教育基金会高等院校青年教师基金(91070);四川省学术与技术带头人培养基金(2200304);四川大学科技创新基金(2004CF06).~~

摘　　要：采用等离子体诱导填孔接枝聚合法在聚碳酸酯核孔(PCTE)膜上成功地接枝了聚N-异丙基丙烯酰胺(PNIPAM),采用X射线光电子能谱(XPS)、傅里叶变换红外光谱仪(FT-IR)、扫描电镜(SEM)、原子力显微镜(AFM)、接触角测量仪和水通量实验,系统地研究了PNIPAM-g-PCTE膜的化学成分、微观结构和温敏特性,以期为环境感应型开关膜的设计和制备提供指导.结果表明,PNIPAM被均匀地接枝在PCTE膜表面和膜孔中;当填孔率F<44.2%时,PNIPAM-g-PCTE膜的膜孔由于孔内接枝物的体积变化而表现出温敏开关特性,并且膜孔径随着F的增大而减小;当F>44.2%以后,水溶液中膜的膜孔被溶胀的PNIPAM接枝链堵塞,此时PNIPAM-g-PCTE膜不再具有温度开关特性;40 ℃时膜孔被完全堵塞的临界填孔率范围在30%～40%之间;随着温度从25 ℃增加到40 ℃,PNIPAM-g-PCTE膜表面的接触角也从58.5°增加到87.9°;PNIPAM-g-PCTE膜水通量的温敏开关特性主要取决于膜孔径的变化,而不是膜表面亲水性的改变.Poly （N-isopropylacrylamide） （PNIPAM） was successfully grafted on the surfaces and in the pores of polycarbonate track-etched （PCTE） membranes by the plasma-graft pore-filling polymerization method, and the chemical composition, microstructure and thermo-responsive characteristics of the PNIPAM-g-PCTE membrane were investigated systematically with XPS, SEM, FT-IR, AFM, contact angle instrument and water flux experiments. The objective of this study was to obtain some guidance for the design and preparation of environmental stimuli-responsive gating membranes. The results showed that, PNIPAM was homogeneously grafted on the surface and in the pores of PCTE membranes. When pore-filling ratio was smaller than 44.2%, the pores of PNIPAM-g-PCTE membranes showed thermoresponsive gating characteristics because of the conformational change of grafted PNIPAM in the pores, and the pore diameters of PNIPAM-grafted membranes became smaller with increasing the pore-filling ratio. On the other hand, when the pore-filling ratio was larger than 44.2%, the pores of membranes immersed in water were choked by the volume expansion of the grafted PNIPAM polymers, and the membranes did not show thermo-responsive gating characteristics any more. The critical pore-filling ratio for choking the membrane pores was in the range from 30% to 40% at 40 ℃. The contact angle of PNIPAM-g-PCTE membrane increased from 58.5° to 87.9° when the temperature changed from 25 ℃ to 40 ℃. The thermo-responsive gating characteristics of the water flux of PNIPAM-g-PCTE membranes were mainly dependent on the pore size change rather than the variation of membrane/pore surface hydrophilicity.

关 键 词：开关膜 聚N-异丙基丙烯酰胺 聚碳酸酯核孔膜 等离子体接枝聚合 微结构 温敏感应 

分 类 号：TQ028.8[化学工程]