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首页> 外文期刊>Journal of Applied Polymer Science >Fabrication of dual-layer poly(styrene-b-4-vinyl pyridine)-poly(vinylidene fluoride) membranes with tailored pore sizes under 10nm via surface quaternization
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Fabrication of dual-layer poly(styrene-b-4-vinyl pyridine)-poly(vinylidene fluoride) membranes with tailored pore sizes under 10nm via surface quaternization

机译：双层聚（苯乙烯-B-4-乙烯基吡啶） - 聚（偏二氟乙烯）膜，通过表面季铵化在10nm下定制孔径的膜

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Block copolymer membranes can be applied to precise size-based separation because of their highly ordered surface morphology and adjustable pore sizes. However, there is a lower limit of the scale of block copolymer self-assembly; this makes it a challenge to tailor the pore size down to below 10nm. In this study, poly(styrene-b-4-vinyl pyridine) membranes were modified to quaternized selective layers with pores smaller than 10nm and were supported by poly(vinylidene fluoride) hollow fibers as the substrate to provide a high mechanical strength. Two reactants, methyl iodide and 2-chloroacetamide, were used in the quaternization. With this one-step chemical modification, the molecular weight cutoff was reduced from 190 to 8 kDa, and the surface pore sizes were narrowed down from 20-30 to 3nm; this bridged the gap of tailored pore sizes down to below 10nm. Such membranes are promising candidates for low-molecular-weight separation with high resolution. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47137.
机译：由于其高度有序的表面形态和可调节的孔径，嵌段共聚物膜可以应用于精确的尺寸分离。但是，嵌段共聚物自组装的规模有下限;这使得定制孔径下降到10nm以下的挑战。在该研究中，将聚（苯乙烯-B-4-乙烯基吡啶）膜改性为尺寸小于10nm的尺寸选择层，并由聚（偏二氟乙烯）中空纤维作为基材负载，以提供高机械强度。在季铵化中使用两种反应物，甲基碘和2-氯乙酰胺。通过这种一步化学改性，分子量截止从190〜8kDa降低，表面孔径从20-30到3nm缩小;这桥接了定制的孔径尺寸下降到10nm以下。这种膜是具有高分辨率的低分子量分离的候选者。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47137。

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