Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr. VO 31, St. Petersburg 199004, Russia.
Shubnikov Institute of Crystallography, Federal Scientific Research Centre "Crystallography and Photonics", Russian Academy of Sciences, Leninskiy pr. 59, Moscow 119333, Russia.
Molecules. 2017 Dec 14;22(12):2227. doi: 10.3390/molecules22122227.
Two-ply composite membranes with separation layers from chitosan and sulfoethylcellulose were developed on a microporous support based on poly(diphenylsulfone--phenylphthalimide) and investigated by use of X-ray diffraction and scanning electron microscopy methods. The pervaporation properties of the membranes were studied for the separation of aqueous alcohol (ethanol, propan-2-ol) mixtures of different compositions. When the mixtures to be separated consist of less than 15 wt % water in propan-2-ol, the membranes composed of polyelectrolytes with the same molar fraction of ionogenic groups (-NH₃⁺ for chitosan and -SO₃ for sulfoethylcellulose) show high permselectivity (the water content in the permeate was 100%). Factors affecting the structure of a non-porous layer of the polyelectrolyte complex formed on the substrate surface and the contribution of that complex to changes in the transport properties of membranes are discussed. The results indicate significant prospects for the use of chitosan and sulfoethylcellulose for the formation of highly selective pervaporation membranes.
两层复合膜的分离层由壳聚糖和磺乙基纤维素组成，在基于聚（二苯砜-苯酞亚胺）的微孔支撑体上开发，并通过 X 射线衍射和扫描电子显微镜方法进行了研究。用该膜对不同组成的醇水溶液（乙醇、异丙醇）混合物进行了渗透蒸发性能研究。当待分离的混合物中异丙醇中的含水量小于 15wt%时，由具有相同摩尔分数离子基团（壳聚糖为 -NH₃⁺，磺乙基纤维素为 -SO₃）的聚电解质组成的膜具有较高的选择性（渗透物中的含水量为 100%）。讨论了影响在基底表面形成的聚电解质复合无孔层结构的因素以及该复合层对膜传输性能变化的贡献。结果表明，壳聚糖和磺乙基纤维素在形成高选择性渗透蒸发膜方面具有广阔的应用前景。
