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Thermodynamics and kinetics control of support layer synthesis for enhanced thin film composite membrane performance

机译:增强薄膜复合膜性能支持层合成的热力学和动力学控制

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The desalination performance of a thin film composite (TFC) membrane hinges highly on the surface characteristics of support membrane. In this study, good wettability, regular pore size, and moderate roughness were identified as the critical surface properties of support membrane in forming a defect-free, uniform, and structurally stable polyamide film. These features were tailored by adjusting the thermodynamics and kinetics properties of the polymer solution via polysulfone (PSf)/polyvinylpyrrolidone (PVP) ratio as well as using N,N-dimethylacetamide (DMAc) and N,N-dimethylformamide as co-solvent. It was found that the membrane formation was controlled kinetically by altering the PSf/PVP ratio but thermodynamically by using co-solvent. The TFC membrane with better desalination performance was achieved with the support membrane prepared at PSf/PVP ratio of 0.941 without any co-solvent. The resulting TFC membrane attained the highest permeability ratio of 0.691 bar(-1) for water/NaCl filtration in this study. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45802.
机译:薄膜复合材料(TFC)膜铰接高度高于支撑膜的表面特性的脱盐性能。在该研究中,良好的润湿性,常规孔径和中等粗糙度被鉴定为形成缺陷,均匀和结构稳定的聚酰胺膜的支撑膜的临界表面性质。通过使用聚砜(PSF)/聚乙烯吡咯烷酮(PVP)比和使用N,N-二甲基乙酰胺(DMAC)和N,N-二甲基甲酰胺作为共溶剂来调节聚合物溶液的热力学和动力学性质来定制这些特征。发现膜形成通过使用共溶剂改变PSF / PVP比而是通过改变PSF / PVP比率来控制。通过在PSF / PVP比为0.941的PSF / PVP比率的载体膜没有任何共溶剂的情况下使用脱盐性能的TFC膜进行。得到的TFC膜在本研究中达到0.691巴(-1)的最高渗透率为0.691巴(-1)。 (c)2017 Wiley期刊,Inc.J.Phill。聚合物。 SCI。 2018,135,45802。

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