Poly(vinyl alcohol) (PVA) / modified carbon nanotubes (CNTs) mixed matrix membranes (MMMs) were prepared to study the pervaporation (PV) dehydration of aqueous azeotrope isopropanol mixture. CNTs were modified by wrapping different amount (5–14 wt%) of poly(styrenesulfonate) (PSSA) and poly(vinylpyrrolidone) (PVP) on CNT respectively. ATR, XRD, FESEM, TGA and tensile tests were used to characterize the modified carbon nanotubes and the membranes. For carbon nanotubes wrapped lower amount of poly(styrenesulfonate), the pervaporation results showed that the separation factor remarkably increased and the flux slightly decreased by increasing the content of the modified nanotubes from 0 to 3 wt%, while a reverse trend was observed with further incorporation of the nanotubes up to 5 wt%. Interestingly, increasing poly(styrenesulfonate) density around nanotubes’ sidewalls led to non-ideal effects such as interchain coiling of poly(styrenesulfonate) and formation of rigidified coiled-coil aggregations, so the best PV results were achieved at lower wrapping of poly(styrenesulfonate). However, wrapping nanotubes by poly(vinylpyrrolidone) resulted in fabrication of nanocomposites without evidence of defects or agglomerations and enhanced thermal and mechanical properties. Among all prepared membranes, the best PSI (303) was obtained by embedding 4 wt% of poly(vinylpyrrolidone)-wrapped-nanotubes into poly (vinyl alcohol) that could be attributed to good compatibility and interactions between the fillers and the matrix. Hydrogen bonding between carbonyl groups of poly(vinylpyrrolidone) and hydroxyl groups of poly(vinyl alcohol), formation of hydrophilic channels and helical wrapping of poly(vinylpyrrolidone) chains instead of interchain coiling were responsible for the observed improvement in separation performance of the membranes containing PVP-wrapped-CNTs.

制备聚乙烯醇（PVA）/改性碳纳米管（CNT）混合基质膜（MMM），以研究共沸异丙醇水溶液的全蒸发（PV）脱水。通过分别包裹不同量（5–14 wt％）的聚（苯乙烯磺酸盐）（PSSA）和聚（乙烯基吡咯烷酮）（PVP）来修饰CNT。使用ATR，XRD，FESEM，TGA和拉伸试验来表征改性的碳纳米管和膜。对于包裹了较少量聚苯乙烯磺酸盐的碳纳米管，渗透汽化结果表明，通过将改性纳米管的含量从0增加到3 wt％，分离系数显着增加，通量略有下降，而进一步观察到相反的趋势。纳米管的掺入量高达5重量％。有趣的是 纳米管侧壁周围聚苯乙烯磺酸盐密度的增加导致非理想的影响，例如聚苯乙烯磺酸盐的链间缠绕和形成刚性的卷曲螺旋聚集体，因此在较低的聚苯乙烯磺酸盐包裹下可获得最佳的PV结果。然而，用聚乙烯基吡咯烷酮包裹纳米管导致了纳米复合材料的制造，而没有缺陷或团聚的迹象，并且没有增强的热和机械性能。在所有制备的膜中，最好的PSI（303）是通过将4 wt％的聚乙烯吡咯烷酮包裹的纳米管嵌入聚乙烯醇中而获得的，这可以归因于填料与基质之间的良好相容性和相互作用。聚乙烯吡咯烷酮的羰基与聚乙烯醇的羟基之间的氢键，