Polyethylenimine (PEI) is a water-soluble polymer with higher density of cations and strong adsorbability. In the present work, loose nanofiltration membranes based on PEI were prepared by surface deposition of PEI on hydrolyzed polyacrylonitrile (PANH) supports through a surface crosslink method without using extra crosslinkers. The thinner selective layer (around 50 nm) of polyelectrolyte complex was formed through the crosslinks (ionic and co-valent) between amine groups in PEI and carboxyl groups in PANH. The PEI/PAN membranes were characterized by SEM, ATR-IR, and XPS. Nanofiltration of PEGs and salt solutions were performed to evaluate the membrane performance. Loose nanofiltration membranes, with molecular weight cut-off from 500 to 950 Da, permeances form 7 to 16 L m(-2) h(-1) bar(-1), were obtained by the simple surface crosslink method. The membrane performance can be facile tailored by controlling the deposition parameters, including deposition time and post-treatments.
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机译：聚乙烯亚胺（PEI）是一种水溶性聚合物，具有较高的阳离子密度和较强的吸附性。本工作采用表面交联法将PEI表面沉积在水解聚丙烯腈（PANH）载体上，制备了基于PEI的疏松纳滤膜，无需使用额外的交联剂。聚电解质复合物的较薄选择层（约50 nm）是通过PEI中的胺基和PANH中的羧基之间的交联（离子和共价）形成的。采用SEM、ATR-IR和XPS对PEI/PAN膜进行表征。对PEGs和盐溶液进行纳滤以评估膜性能。采用简单表面交联法制备了截留分子量为500-950 Da、渗透率为7-16 L m（-2） h（-1） bar（-1）的疏松纳滤膜。通过控制沉积参数，包括沉积时间和后处理，可以很容易地定制膜性能。
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