Abstract To enable wider deployment of ultrafiltration (UF) membrane technology, novel advanced membrane materials are still highly desired. Chlorinated polyvinyl chloride (CPVC) shares most of the outstanding features of polyvinyl chloride (PVC) and possesses improved thermal stability, indicating a promising material for UF membrane. To date, however, the separation performance of the current CPVC UF membranes is far below the requirements for application. In this study, propylene glycol and polyoxyethylene-20-sorbaitan monolaurate (Tween-20) were selected as compound additives to manipulate the structure and separation performance of CPVC membrane fabricated by the non-solvent induced phase separation process. The results demonstrated that the synergistic effect of compound additives led to instantaneous demixing to increase the ratio of polymer lean phase in the initial casting film, and the rapid precipitation fixed the phase separation structure immediately. Consequently, the prepared membranes possessed improved porosity and pore size uniformity. The obtained CPVC UF membranes exhibited a high pure water flux up to 955.2 L m-2 h-1·bar-1 with a BSA rejection above 95.0%, which is 11 times higher than CPVC membrane fabricated without additive and comparable to that of commercial UF membranes. In addition, thanks to the more uniform pore size distribution and smooth top surface, the obtained CPVC membranes also exhibited good antifouling performance. Moreover, the CPVC UF membrane showed good thermal stability and reuse performance, which would facilitate its post-functionalization and practical application.

中文翻译：

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复合添加剂调控非溶剂诱导相分离制备高性能氯化聚氯乙烯超滤膜

摘要 为了使超滤（UF）膜技术得到更广泛的应用，仍然非常需要新型先进的膜材料。氯化聚氯乙烯 (CPVC) 具有聚氯乙烯 (PVC) 的大部分突出特性，并具有更高的热稳定性，表明是一种很有前途的超滤膜材料。然而，目前CPVC UF膜的分离性能远低于应用要求。在本研究中，选择丙二醇和聚氧乙烯-20-脱水山梨糖醇单月桂酸酯 (Tween-20) 作为复合添加剂，以操纵通过非溶剂诱导相分离工艺制备的 CPVC 膜的结构和分离性能。结果表明，复合添加剂的协同作用导致瞬时分层，增加了初始流延膜中聚合物贫相的比例，快速沉淀立即固定了相分离结构。因此，制备的膜具有改进的孔隙率和孔径均匀性。所得CPVC UF膜的纯水通量高达955.2 L m-2 h-1·bar-1，BSA截留率超过95.0%，是无添加剂制造的CPVC膜的11倍，可与商用膜相媲美。超滤膜。此外，由于孔径分布更均匀，顶面光滑，得到的CPVC膜也表现出良好的防污性能。此外，CPVC UF膜表现出良好的热稳定性和再利用性能，