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首页> 外文期刊>Advanced Functional Materials >Sustainable Membrane Production through Polyelectrolyte Complexation Induced Aqueous Phase Separation
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Sustainable Membrane Production through Polyelectrolyte Complexation Induced Aqueous Phase Separation

机译：通过聚电解质络合诱导的水相分离可持续生产膜

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摘要

Nonsolvent induced phase separation (NIPS) is the most common approach to produce polymeric membranes. Unfortunately, NIPS relies heavily on aprotic organic solvents like N-methyl-pyrrolidone. These solvents are unsustainable, repro-toxic for humans and are therefore becoming increasingly restricted within the European Union. A new and sustainable method, aqueous phase separation (APS), is reported that eliminates the use of organic solvents. A homogeneous solution of two polyelectrolytes, the strong polyanion poly(sodium 4-styrenesulfonate) (PSS) and the weak polycation poly(allylamine hydrochloride) (PAH), is prepared at high pH, where PAH is uncharged. Immersing a film of this solution in a low pH bath charges the PAH and results in a controlled precipitation, forming a porous water-insoluble polyelectrolyte complex, a membrane. Pore sizes can be tuned from micrometers to just a few nanometers, and even to dense films, simply by tuning the polyelectrolyte concentrations, molecular weights, and by changing the salinity of the bath. This leads to excellent examples of microfiltration, ultrafiltration, and nanofiltration membranes. Polyelectrolyte complexation induced APS is a viable and sustainable approach to membrane production that provides excellent control over membrane properties and even allows new types of separations.
机译：非溶剂诱导的相分离（NIPS）是生产聚合物膜的最常用方法。不幸的是，NIPS严重依赖于非质子有机溶剂，例如N-甲基-吡咯烷酮。这些溶剂对人类来说是不可持续的，具有生殖毒性，因此在欧盟范围内受到越来越多的限制。据报道，一种新型且可持续的方法是水相分离（APS），它消除了有机溶剂的使用。在高pH值下制备两种聚电解质的均质溶液，即强聚阴离子聚（4-苯乙烯磺酸钠）（PSS）和弱聚阳离子聚烯丙基胺盐酸盐（PAH），而PAH不带电。将该溶液的膜浸入低pH浴中会给PAH充电，并导致受控的沉淀，从而形成多孔的水不溶性聚电解质复合物，膜。只需调节聚电解质的浓度，分子量和改变浴液的盐度，孔径就可以从微米调整到几纳米，甚至到致密的薄膜。这是微滤，超滤和纳滤膜的典范。聚电解质络合诱导的APS是一种可行且可持续的膜生产方法，它可以很好地控制膜性能，甚至可以进行新型分离。

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