Self-Supporting, Double Stimuli-Responsive Porous Membranes From Polystyrene-block-poly (N,N-dimethylaminoethyl methacrylate) Diblock Copolymers
Self-Supporting, Double Stimuli-Responsive Porous Membranes From Polystyrene-block-poly (N,N-dimethylaminoethyl methacrylate) Diblock Copolymers
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DOI：
10.1002/adfm.200801457
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发表时间：
2009-04-09
影响因子：
19
通讯作者：
Mueller, Axel H. E.
中科院分区：
文献类型：
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作者：
Schacher, Felix;Ulbricht, Mathias;Mueller, Axel H. E.
以聚苯乙烯-嵌段聚（N，N-二甲氨基乙基甲基丙烯酸酯）（PS-b-PDMAEMA）嵌段共聚物为原料，采用非溶剂诱导相分离（NIPS）工艺制备了不对称膜。该聚合物是通过序贯活阴离子聚合制备的。用扫描电镜对膜的表面和体积结构进行了表征。由于膜的不对称特性，导致膜的分离层很薄，顶部有小于100 nm的孔和大孔的体积结构，膜是自支撑的。此外，它们在超过100 μ m(2)的范围内表现出无缺陷的表面。聚苯乙烯作为膜基质，而pH和温度敏感的少数块PDMAEMA使材料具有双重刺激响应。因此，就水通量而言，膜能够在两个独立适用的刺激下发生反应，PH和温度。与获得最低水通量的条件（低温和PH）相比，激活这两种触发因素导致渗透率增加7倍。通过对粒径为12 ~ 100 nm的二氧化硅颗粒的ph依赖过滤，测试了所得膜的孔径分布和分离性能。
Asymmetric membranes are prepared via the non-solvent-induced phase separation (NIPS) process from a polystyrene-block-poly(N,N-dimethylaminoethyl methacrylate) (PS-b-PDMAEMA) block copolymer. The polymer is prepared via sequential living anionic polymerization. Membrane surface and volume structures are characterized by scanning electron microscopy. Due to their asymmetric character, resulting in a thin separation layer with pores below 100 nm on top and a macroporous volume structure, the membranes are self-supporting. Furthermore, they exhibit a defect-free surface over several 100 mu m(2). Polystyrene serves as the membrane matrix, whereas the pH- and temperature-sensitive minority block, PDMAEMA, renders the material double stimuli-responsive. Therefore, in terms of water flux, the membranes are able to react on two independently applicable stimuli, PH and temperature. Compared to the conditions where the lowest water flux is obtained, low temperature and PH, activation of both triggers results in a seven-fold permeability increase. The pore size distribution and the separation properties of the obtained membranes were tested through the pH-dependent filtration of silica particles with sizes of 12-100 nm.