Design and performance of foul-resistant poly(vinylidene fluoride) membranes prepared in a single-step by surface segregation
Design and performance of foul-resistant poly(vinylidene fluoride) membranes prepared in a single-step by surface segregation
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DOI：
10.1016/s0376-7388(01)00735-9
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发表时间：
2002-06-15
影响因子：
9.5
通讯作者：
Mayes, AM
中科院分区：
文献类型：
--
作者：
Hester, JF;Mayes, AM
用聚偏氟乙烯（PVDF）和一种具有甲基丙烯酸酯骨架和聚环氧乙烷侧链的自由合成的两亲性梳状聚合物共混物制备了具有增强抗污性的浸没沉淀膜。x射线光电子能谱分析表明，在膜混凝过程中，梳状聚合物的表面发生了明显的分离，对于含有10 wt.% （14.6 vol.%）的膜，梳状聚合物的近表面综合覆盖率高达50 vol.%。表面覆盖率随着梳子分子量的增加而增加，为亲水性表面提供了极好的稳定性，并证实了表面定位的机制。梳子改性膜的分离表面孔隙率高达高于PVDF控制的数量级。具有抗污性和增加孔隙率的综合优势，在过滤污染蛋白溶液3小时后，含有10 wt.%梳子的膜的渗透性是具有同等分离特性的pvdf膜的20倍以上。(C) 2002 Elsevier Science B.V.版权所有
Immersion precipitated membranes with enhanced fouling resistance are prepared from blends of poly(vinylidene fluoride) (PVDF) and a free-radically synthesized amphiphilic comb polymer having a methacrylate backbone and poly(ethylene oxide) side chains. X-ray photoelectron spectroscopy analysis indicates substantial surface segregation of the comb polymer during membrane coagulation, providing an integrated near-surface coverage of up to 50 vol.% comb for a membrane containing 10 wt.% (14.6 vol.%). The surface coverage increases with comb molecular weight, providing hydrophilic surfaces with excellent stability and substantiating a proposed mechanism for surface localization. Separation surface porosities for comb-modified membranes are up to an order of magnitude higher than PVDF controls. With the combined benefits of fouling resistance and increased porosity, a membrane containing 10 wt.% comb is over 20 times as permeable as a PVDF-only membrane with equivalent separation characteristics after 3 h of filtration of a foulant protein solution. (C) 2002 Elsevier Science B.V. All rights reserved.