表面活性剂结构对界面聚合中MPD扩散的影响

IF 4.9 Q1 ENGINEERING, CHEMICAL
Shahriar Habib, Bryn E. Larson, Steven T. Weinman
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引用次数: 1

摘要

表面活性剂辅助界面聚合(IP)制备的聚酰胺膜已显示出优异膜性能的潜力。表面活性剂的存在加速了胺向有机相中的扩散,导致更完全的IP反应。尽管表面活性剂辅助的IP已用于聚酰胺膜,但表面活性剂对胺向有机相中传输的结构-性质关系尚未得到系统的探索。在这项工作中,评估了在阴离子、阳离子和非离子七种不同表面活性剂存在下,MPD从膜载体扩散到正十二烷中。当表面活性剂以不同浓度使用时,在阴离子(48–80%)、阳离子(32–75%)和非离子(26%)表面活性剂的存在下,MPD浓度增加。在阴离子(48–72%)、阳离子(32–75%)和非离子表面活性剂(26%)存在的情况下,MPD浓度在15–60 s的接触时间内增加。为了进一步理解,测量了表面活性剂在正十二烷中的界面张力,然而,它与我们的数据无关。这项研究更好地了解了在反渗透膜合成过程中,不同类型表面活性剂存在下MPD的扩散,这将有助于我们设计具有更好渗透性和选择性的膜。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of surfactant structure on MPD diffusion for interfacial polymerization

Effect of surfactant structure on MPD diffusion for interfacial polymerization

Polyamide membranes made with surfactant-assisted interfacial polymerization (IP) have demonstrated the potential for excellent membrane performance. The presence of surfactants accelerates amine diffusion into the organic phase causing a more complete IP reaction. Even though surfactant-assisted IP has been used in polyamide membranes, the structure-property relationship of the surfactants on amine transport into the organic phase has not been explored in a systematic manner. In this work, MPD diffusion from a membrane support into n-dodecane in the presence of seven different surfactants, which were anionic, cationic, and non-ionic, was evaluated. When the surfactants were used at different concentrations, the MPD concentration was increased in the presence of anionic (48–80%), cationic (32–75%) and non-ionic (26%) surfactants. The MPD concentration was increased in the presence of anionic (by 48–72%), cationic (by 32–75%), and non-ionic surfactants (by 26%) at 15–60 s contact time. For further understanding, the interfacial tension in n-dodecane for the surfactants was measured, however, it did not correlate with our data. This study provides a better understanding of MPD diffusion in the presence of different types of surfactants during RO membrane synthesis, which will help us to engineer membranes with better permeability and selectivity.

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