有机/无机杂化纳米粒子共混改性聚偏氟乙烯多孔膜及其表面两性离子化的研究

摘要

通过表面引发的可逆-加成断裂链转移(RAFT)聚合,制备了聚甲基丙烯酸甲酯-聚甲基丙烯酸二甲氨乙酯嵌段共聚物(PMMA-b-PDMAEMA)接枝改性的有机/无机杂化二氧化硅纳米粒子(BCP-g-SiO2 NPs),并将其与聚偏氟乙烯(PVDF)溶液共混,通过传统的非溶剂诱导相分离(NIPS)法制备 PVDF/BCP-g-Si O 2有机-无机杂化分离膜,进一步通过膜表面PDMAEMA链段与1,3-丙磺酸内酯之间的季胺化反应,实现了 PVDF/BCP-g-SiO2有机-无机杂化膜的表面两性离子化。研究结果表明,BCP-g-SiO2 NPs 的引入以及膜表面的进一步两性离子化显著提高了 PVDF膜的亲水性和抗污染性能,是 PVDF 超滤膜等相转化膜材料改性的有效方法。%The BCP-g-SiO2 NPs were first prepared by grafting block copolymer of poly(methylmethacrylate) and poly(2-(dimethylamino)ethyl methacrylate)brushes onto SiO2 NPs via surface-initiated reversible addition fragmentation chain transfer (RAFT)polymerization.Then the BCP-g-SiO2 NPs were blended with PVDF to prepare PVDF/BCP-g-SiO2 organic-inorganic hybrid membranes by the traditional non-solvent induced phase separation (NIPS)method.Subsequently,the PDMAEMA chains were zwitterionicalized by 1 ,3-propane sul-tone (1,3-PS).Therefore,the surface zwitterionicalization PVDF/BCP-g-SiO2 organic-inorganic hybrid mem-branes were successful prepared.The hydrophilicity and antifouling ability of the PVDF membrane were signifi-cantly enhanced after surface zwitterionicalization.Therefore,it was an effective method to modify the PVDF membrane using BCP-g-SiO2 NPs as additive together with surface zwitterionicalizationa.