Abstract The work aimed to prepare co-polyalkoxyether-imide (PEI) asymmetric membranes to appreciate high flux water selective polymeric membranes appropriate for the separation of organic molecules from aqueous mixtures by nanofiltration. These membranes were prepared under controlled experimental conditions from solvent non-solvent of N,N-dimethylformamide (DMF) – water (H2O) solutions with the corresponding polyamic acid (PAA); after the wet phase inversion in a water bath, the PAA membranes were imidized by thermal treatment. The membrane physical properties, recorded by SEM, were used to optimize the asymmetric membrane preparation to improve the separation properties by tuning the thickness of the dense top layer. The performances of nanofiltration separations were examined in the light of the influence of sets of parameters. The flux of asymmetric PEI membranes increased with an increase of applied pressure. Additional, the permeate flux and membrane permeance for pure water is better than the aqueous organic solutions. Thus, the aqueous organic solution has an influence on decreasing the flux and membrane permeance. PEI membranes showed high rejection for hydrophilic molecules, like polyethylene glycol, with molecular weight ranging from 400 to 6000 Dalton; according to molecular weight, organic rejection of 79–100% were achieved from 500 ppm aqueous solutions of organic compounds.

中文翻译：

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用于纳滤处理的不对称聚醚酰亚胺膜 (PEI)

摘要 该工作旨在制备共聚烷氧基醚-酰亚胺 (PEI) 不对称膜，以欣赏适用于通过纳滤从水性混合物中分离有机分子的高通量水选择性聚合物膜。这些膜是在受控的实验条件下由 N,N-二甲基甲酰胺 (DMF) - 水 (H2O) 溶液和相应的聚酰胺酸 (PAA) 的溶剂非溶剂制备的；在水浴中进行湿相转化后，PAA 膜通过热处理进行酰亚胺化。SEM 记录的膜物理特性用于优化非对称膜制备，通过调整致密顶层的厚度来改善分离性能。根据参数组的影响来检查纳滤分离的性能。不对称 PEI 膜的通量随着施加压力的增加而增加。此外，纯水的渗透通量和膜渗透性优于有机水溶液。因此，有机水溶液对降低通量和膜渗透性有影响。PEI 膜对亲水性分子（如聚乙二醇，分子量范围为 400 至 6000 道尔顿）显示出很高的截留率；根据分子量，从 500 ppm 的有机化合物水溶液中实现了 79-100% 的有机去除率。PEI 膜对亲水性分子（如聚乙二醇，分子量范围为 400 至 6000 道尔顿）显示出很高的截留率；根据分子量，从 500 ppm 的有机化合物水溶液中实现了 79-100% 的有机去除率。PEI 膜对亲水性分子（如聚乙二醇，分子量范围为 400 至 6000 道尔顿）显示出很高的截留率；根据分子量，从 500 ppm 的有机化合物水溶液中实现了 79-100% 的有机去除率。