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    Reactable substrate participating interfacial polymerization for thin film composite membranes with enhanced salt rejection performance

    Year: 2018

    Journal: Desalination, Volume 436, JUN 15, page 1–7

    Authors: Yao, Zhikan; Guo, Hao; Yang, Zhe; Lin, Chuner; Zhu, Baoku; Dong, Yingchao; Tang, Chuyang Y.

    Organizations: General Research Fund at the University of Hong Kong [17207514]; Strategic Research Theme (Clean Energy) at the University of Hong Kong; 111 Talent Program; Programme of Introducing Talents of Discipline to Universities [B13012]; Haitian Scholar Program from Dalian University of Technology

    Keywords: Thin film composite; Interfacial polymerization; Reactable substrate; Poly vinyl chloride; Polyamide

    In this study, we investigate the use of reactable substrates for interfacial polymerization of polyamide membranes. Two reactable group (hydroxyl group) contained substrates were prepared. Using m-phenylenediamine (MPD) and trimesoyl chloride (TMC) as monomers, thin film composite (TFC) membrane formed thereon displayed varying film morphology, chemical composition and separation performance. The substrate participating TFC membrane showed a thicker rejection layer with greater crosslinking density. The latter was caused by the formation of ester bonds in addition to amide bonds. This polyamide/polyester composite rejection layer had greatly enhanced NaCl and Na2SO4 rejection compared to the control membrane prepared on inert substrate. We further proposed a conceptual model that highlighted the important role of amphiphilic copolymers as (1) MPD enrichment loaders, (2) reactive monomers and (3) surfactants in the interfacial polymerization process.
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