Membrane formation mechanism and permeation properties of a novel porous polyimide membrane

Membrane formation mechanism and permeation properties of a novel porous polyimide membrane
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新型聚酰亚胺多孔膜的成膜机理及渗透性能

DOI：
10.1002/pat.201
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
S. Nagaoka
S. Nagaoka
中科院分区：
--
文献类型：
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作者：
H. Shimizu;H. Kawakami;S. Nagaoka

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采用搅拌死区滤池，研究了湿相转化法制备的新型多孔氟聚酰亚胺膜的传质性能。多孔成膜溶剂为四氢呋喃(THF)、丙酮、N，N-二甲基乙酰胺(DMAc)、N-甲基吡咯烷酮(NMP)、N，N-二甲基甲酰胺(DMF)和二甲基亚砜(DMSO)。用滴定方法从浊点曲线和二元相互作用参数研究了聚酰亚胺/溶剂/水三元体系的相分离现象。研究发现，该体系中的溶剂-水分离对聚酰亚胺膜的结构和表面形态起着非常重要的作用。多孔氟化聚酰亚胺膜的孔径为4~500 nm，渗透性能从超滤到微滤范围。在这项研究中，我们特别关注聚酰亚胺膜的污染，因为污染降低了通量，增加了阻力。有趣的是，与聚醚砜(PSF)膜相比，多孔聚酰亚胺膜在水洗后表现出良好的水通量恢复，这表明对于6FDA-6FAP膜，蛋白质-膜和蛋白质-蛋白质的相互作用不如PSF膜那么强。版权所有©2002 John Wiley&Sons，Ltd.
The transport properties of a novel porous fluorinated polyimide membrane fabricated by a wet phase inversion process were studied with a stirred dead-end filtration cell. The porous membrane-forming solvents were tetrahydrofuran (THF), acetone, N,N-dimethylacetamide (DMAc), N-methylpyrrolidone (NMP), N,N-dimethylformamide (DMF), and dimethylsulfoxide (DMSO). The phase separation phenomena in a ternary system of polyimide/solvent/water were investigated from cloud point curves by a titration method and binary interaction parameters. Solvent–water demixing in the system has been found to play very important roles in determining the structure and surface morphology of the polyimide membrane. The porous fluorinated polyimide membranes showed pore sizes from 4 to 500 nm and permeation properties from ultrafiltration to a microfiltration range. In this study, we particularly focused on fouling of the polyimide membranes, because fouling decreases the flux and increases the resistance. Interestingly, the porous polyimide membrane showed excellent water flux recovery after water cleaning compared with that of the polyethersulfone (PSf) membrane, which suggest that for a 6FDA-6FAP membrane, the protein–membrane and protein–protein interaction was not so strong compared with those in a PSf membrane. Copyright © 2002 John Wiley & Sons, Ltd.