Abstract By means of (1) electrostatic interactions between polyethyleneimine (PEI) and sulfonated polyphenylenesulfone (sPPSU) as well as (2) subsequent glutaraldehyde (GA) cross-linking modification, two types of OSN membranes with high solvent permeances and good solute rejections have been fabricated. The PEI-coated sPPSU membrane fabricated under the optimized dip-coating condition has a molecular weight cut-off (MWCO) of about 500 Da in ethanol, while the GA-cross-linked membrane has a MWCO of 300 Da. The former has a rejection of 99.8% to Rose Bengal and a permeance of > 40 Lm−2 h−1 bar−1 in the methanol system because methanol has a small kinetic diameter and a low viscosity. The permeance drops to about 10 Lm−2 h−1 bar−1 and the rejection dips slightly to 99.1% in the ethanol system because ethanol has a large kinetic diameter and a high viscosity. The latter possesses an ethanol permeance of 1.4 Lm−2 h−1 bar−1 and shows stable OSN performance in 14-day tests to Methylene Blue in methanol, ethanol and isopropanol (IPA) systems. The GA-cross-linked membrane and the commercially available DuraMem 300 membranes have a similar MWCO, but the GA-cross-linked membrane has a 3.5-time higher ethanol permeance than DuraMem 300. This study may provide useful insights to design sPPSU membranes with high separation performance for OSN applications.

中文翻译：

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用于有机溶剂纳滤的具有高分离性能的磺化聚苯砜 (sPPSU) 膜的简便制造

摘要 通过 (1) 聚乙烯亚胺 (PEI) 和磺化聚苯砜 (sPPSU) 之间的静电相互作用以及 (2) 随后的戊二醛 (GA) 交联改性，两种具有高溶剂渗透性和良好溶质截留率的 OSN 膜具有被捏造。在优化的浸涂条件下制备的 PEI 涂层 sPPSU 膜在乙醇中的截留分子量 (MWCO) 约为 500 Da，而 GA 交联膜的截留分子量 (MWCO) 为 300 Da。前者对玫瑰红的排斥率为 99.8%，在甲醇系统中的渗透率 > 40 Lm-2 h-1 bar-1，因为甲醇具有小动力学直径和低粘度。磁导率下降到大约 10 Lm-2 h-1 bar-1，排斥率略微下降到 99。在乙醇体系中为 1%，因为乙醇具有大的动力学直径和高粘度。后者具有 1.4 Lm-2 h-1 bar-1 的乙醇渗透率，并且在甲醇、乙醇和异丙醇 (IPA) 系统中对亚甲基蓝的 14 天测试中显示出稳定的 OSN 性能。GA 交联膜和市售的 DuraMem 300 膜具有相似的 MWCO，但 GA 交联膜的乙醇渗透性比 DuraMem 300 高 3.5 倍。这项研究可能为设计具有以下特性的 sPPSU 膜提供有用的见解OSN 应用程序的高分离性能。