Surface and interface characterization of smart membranes
Surface and interface characterization of smart membranes
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DOI：
10.1002/sia.1834
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发表时间：
2004-08
影响因子：
1.7
通讯作者：
G. Zhai;L. Ying;E. Kang;K. Neoh
中科院分区：
文献类型：
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作者：
G. Zhai;L. Ying;E. Kang;K. Neoh
以聚N-异丙基丙烯酰胺（PNIPAm）和聚偏氟乙烯（PVDF）为共混物，分别接枝聚丙烯酸（PAAc）和聚4-乙烯基吡啶（P4 VP）侧链（PVDF-g-PAAc/PNIPAm和PVDF-g-P4 VP/PNIPAm），采用水相转化法制备了多刺激响应型微滤膜。元素和XPS分析表明，在PVDF-g-PAAc/PNIPAm和PVDF-g-P4 VP/PNIPAm共混物膜中PNIPAm的本体和表面浓度都随着用于浇铸溶液的共混物中PNIPAm浓度的增加而增加。PNIPAm链的表面富集发生在这两种类型的膜，导致表面浓度的10倍的散装。扫描电镜结果表明，凝胶浴的pH值和温度可以调节膜的孔结构。实际测量表明，PVDF-g-P4 VP/PNIPAm共混膜的孔径随着温度的升高和水性铸塑浴的pH的降低而增加。通过PVDF-g-PAAc/PNIPAm和PVDF-g-P4 VP/PNIPAm共混膜的通量同时表现出温度和pH依赖性行为。版权所有© 2004年约翰威利父子有限公司。
Multistimuli‐responsive microfiltration (MF) membranes were fabricated from blends of poly(N‐isopropylacrylamide) (PNIPAm) and poly(vinylidene fluoride) (PVDF) grafted with poly(acrylic acid) (PAAc) and poly(4‐vinylpyridine) (P4VP) side‐chains (PVDF‐g‐PAAc/PNIPAm and PVDF‐g‐P4VP/PNIPAm, respectively) by phase inversion in aqueous media. Elemental and XPS analyses indicated that both the bulk and surface concentration of PNIPAm in the PVDF‐g‐PAAc/PNIPAm and PVDF‐g‐P4VP/PNIPAm blend membranes increased with increasing PNIPAm concentration in the blend used for the casting solution. Surface enrichment of the PNIPAm chains occurred in both types of membrane, leading to a surface concentration ten times that of the bulk. SEM results showed that the porous morphology of the membranes could be regulated by the pH and temperature of the coagulation bath. Actual measurements revealed that the pore size of the PVDF‐g‐P4VP/PNIPAm blend membranes increased with the increase in temperature and the decrease in pH of the aqueous casting bath. The flux through the PVDF‐g‐PAAc/PNIPAm and PVDF‐g‐P4VP/PNIPAm blend membranes exhibited simultaneously temperature‐ and pH‐dependent behaviour. Copyright © 2004 John Wiley & Sons, Ltd.