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首页> 外文期刊>Journal of Applied Polymer Science >Polyamide/polyacrylonitrile thin film composites as forward osmosis membranes
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Polyamide/polyacrylonitrile thin film composites as forward osmosis membranes

机译：聚酰胺/聚丙烯腈薄膜复合材料作为正向渗透膜

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摘要

Thin film composites (TFCs) as forward osmosis (FO) membranes for seawater desalination application were prepared. For this purpose, polyacrylonitrile (PAN) as a moderately hydrophilic polymer was used to fabricate support membranes via nonsolvent-induced phase inversion. A selective thin polyamide (PA) film was then formed on the top of PAN membranes via interfacial polymerization reaction of m-phenylenediamine and trimesoyl chloride (TMC). The effects of PAN solution concentration, solvent mixture, and coagulation bath temperature on the morphology, water permeability, and FO performance of the membranes and composites were studied. Support membranes based on low PAN concentrations (7 wt %), NMP as solvent and low coagulation bath temperature (0 degrees C) demonstrated lower thickness, thinner skin layer, more porosity, and higher water permeability. Meanwhile, decreasing the PAN solution concentration lead to higher water permeance and flux and lower reverse salt flux, structural parameter, and tortuosity for the final TFCs. Composites made in N,N-dimethylformamide presented lower permeance and flux for water and salt and higher salt rejection, structural parameter, and tortuosity. FO assay of the composites showed lower water permeance values in saline medium comparing to pure water. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44130.
机译：制备了用于海水淡化的正向渗透（FO）薄膜复合材料（TFC）。为此，使用聚丙烯腈（PAN）作为中等亲水性聚合物，通过非溶剂诱导的相转化来制备支撑膜。然后通过间苯二胺和均苯三甲酰氯（TMC）的界面聚合反应在PAN膜的顶部形成选择性聚酰胺薄膜（PA）。研究了PAN溶液浓度，溶剂混合物和混凝浴温度对膜和复合材料的形态，透水性和FO性能的影响。基于低PAN浓度（7 wt％），NMP作为溶剂和低凝固浴温度（0摄氏度）的支撑膜表现出更低的厚度，更薄的表皮层，更大的孔隙率和更高的透水性。同时，降低PAN溶液浓度会导致最终TFC的较高的水渗透性和通量，以及较低的反盐通量，结构参数和曲折度。由N，N-二甲基甲酰胺制成的复合材料对水和盐的渗透性和通量较低，而对盐的排阻率，结构参数和曲折度较高。与纯水相比，复合材料的FO分析显示在盐水培养基中的水渗透率值较低。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，44130。

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