Composite polyelectrolyte pervaporation membranes were fabricated through layer-by-layer self-assembly method. Cationic polyethyleneimine (PEI) and anionic poly(4-styrene sulfonic acid-co-maleic acid) (PSSMA) polyelectrolytes were deposited one after the other on a porous asymmetric modified polyacrylonitrile (mPAN) substrate. Attenuated total reflection–Fourier transform infrared spectral analysis and X-ray photoelectron spectrometry confirmed the deposition of polyelectrolytes on the mPAN support. Field emission scanning electron microscopy depicted that pores in the mPAN support were covered with layers of polyelectrolytes. Atomic force microscopy illustrated that the deposition of polyelectrolytes led to a smooth surface of the membrane. Moreover, the membrane exhibited improved hydrophilicity. We investigated the effect of polyelectrolyte concentrations on the efficiency of dehydrating 90 wt% aqueous alcohol solutions through pervaporation. The results established that bilayer polyelectrolyte membranes fabricated from 0.9 wt% PEI and 0.1 w% PSSMA delivered maximal dehydration efficiency.

通过层层自组装法制备了复合聚电解质渗透汽化膜。阳离子聚乙烯亚胺（PEI）和阴离子聚（4-苯乙烯磺酸-顺丁烯二酸）（PSSMA）聚电解质一个接一个地沉积在多孔不对称改性聚丙烯腈（mPAN）基底上。衰减全反射-傅立叶变换红外光谱分析和X射线光电子能谱证实了聚电解质在mPAN载体上的沉积。场发射扫描电子显微镜显示，mPAN载体中的孔被聚电解质层覆盖。原子力显微镜表明，聚电解质的沉积导致膜的光滑表面。此外，该膜表现出改善的亲水性。我们研究了聚电解质浓度对通过全蒸发使90 wt％的乙醇水溶液脱水的效率的影响。结果表明，由0.9 wt％PEI和0.1 w％PSSMA制成的双层聚电解质膜可提供最大的脱水效率。