Our study is concerned with the development of a novel type of layer‐by‐layer (LbL) self‐assembled membrane from a single cationic polyelectrolyte (PE) and blended anionic PEs. Their synthetic seawater stability is investigated as a function of PE type and blend ratios using quartz crystal microbalance‐dissipation (QCM‐D). These materials adsorbed into multilayers with significant viscoelasticity. Poly(allylamine hydrochloride) (PAH) and poly(vinylamine hydrochloride) (PVA) based LbL blend films did not show any multilayer decomposition with the addition of synthetic seawater regardless of blend ratio while chitosan based multilayers disintegrated. The flux of PVA based blend membrane to water with 1,000 ppm NaCl was found to be 6.7 L/m².h at 40 bar and the flux properties of the membranes were highly dependent on both the thickness and hydrophilicity of multilayers. Ion rejection can be controlled with the charge of the top layer consistent with a Donnan exclusion approach. Sodium ion rejection of 60.5 layered LbL blend membrane was 98.4% at 40 bar and it was determined that sodium ion rejection improved 110.7% compared to a commercial nanofiltration membrane. POLYM. ENG. SCI., 60:1006–1018, 2020. © 2020 Society of Plastics Engineers

中文翻译：

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通过石英晶体微天平耗散监测聚电解质共混物的层间自组装膜的盐稳定性及其离子分离性能

我们的研究涉及一种由单一阳离子聚电解质（PE）和混合阴离子PE构成的新型分层（LbL）自组装膜的开发。使用石英晶体微天平耗散（QCM-D）研究了它们的合成海水稳定性与PE类型和混合比的关系。这些材料吸附到具有显着粘弹性的多层中。基于聚（烯丙胺盐酸盐）（PAH）和基于聚（乙烯基胺盐酸盐）（PVA）的LbL共混膜在添加壳聚糖的基础上，无论掺合比例如何，都不会表现出任何多层分解现象，而壳聚糖基多层则会崩解。发现基于PVA的共混膜与1,000 ppm NaCl的水通量为6.7 L / m ²在40巴下的.h和膜的通量性质高度取决于多层的厚度和亲水性。可以通过与Donnan排除方法一致的顶层电荷来控制离子排斥。60.5层LbL共混膜的钠离子截留率在40 bar下为98.4％，并且确定与商业纳滤膜相比，钠离子截留率提高了110.7％。POLYM。ENG。SCI。，60：1006-1018，2020.©2020塑料工程师协会