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Thin film composite polyamide membranes: parametric study on the influence of synthesis conditions

机译：薄膜复合聚酰胺膜：参数研究合成条件的影响

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Preparation of thin film composite (TFC) polyamide (PA) membranes by interfacial polymerization (IP) reaction is remarkably sensitive to the interactions between synthesis parameters. Here we report the effect of the simultaneous change in four synthesis parameters, namely monomers concentrations ( m -phenylenediamine, MPD, and trimesoyl chloride, TMC), reaction time and curing temperature, on the surface morphology and on the permeation properties of TFC membranes. By varying several synthesis parameters at the same time using a Taguchi robust design (L9 orthogonal arrays), it was found that monomers concentration and curing temperature significantly affected water permeation by creating a substantial change in morphology of the PA films. More importantly, a strong interaction between monomers concentration was observed, which demonstrates the importance of smart adjustment of these parameters in the preparation process. Permeation properties were justified by thickness and by the cross-link density of the synthesized films; the latter was found to be more influential. Based on analysis of variance (ANOVA), the contribution of the synthesis parameters towards change in water permeation was determined as: curing temperature (40.7%) > MPD concentration (28%) ～ TMC concentration (27.8%) > reaction time (1.9%). The findings will provide valuable guidelines to develop practical low cost, robust and high performance membranes by changing the curing temperature and the monomer concentrations as critical parameters.
机译：通过界晶聚合（IP）反应的薄膜复合（TFC）聚酰胺（PA）膜对合成参数之间的相互作用非常敏感。在这里，我们报告了四种合成参数的同时变化，即单体浓度（M-phenylenyleni金属，MPD和TMIMESOYL，TMC），反应时间和固化温度对TFC膜的渗透性能的影响。通过使用Taguchi鲁棒设计（L9正交阵列）的同时改变若干合成参数，发现单体浓度和固化温度通过产生PA薄膜形态的实质性变化来显着影响水渗透。更重要的是，观察到单体浓度之间的强相互作用，这证明了在制备过程中智能调节这些参数的重要性。渗透性能通过厚度和合成膜的交联密度合理。后者被发现更具影响力。基于对差异（ANOVA）的分析，确定合成参数对水渗透变化的贡献确定为：固化温度（40.7％）> MPD浓度（28％）〜TMC浓度（27.8％）>反应时间（1.9％） ）。该研究结果将提供有价值的指导原则，通过改变固化温度和单体浓度作为关键参数来开发实用的低成本，鲁棒和高性能膜。

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