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荷负电中空纤维膜的制备、微结构调控及渗透性能研究

作者：武志国¹，²杨敬葵³秦舒浩³崔振宇¹

单位： 1天津工业大学材料科学与工程学院，天津，300387；2苏伊士水务技术(上海)有限公司，上海，200135；3贵州省材料产业技术研究院，贵阳，550014

关键词：热致相分离；聚偏氟乙烯；表面沉积；超滤；微结构调控

DOI号：

分类号： TB34

出版年,卷(期):页码： 2021,41(6):1-9

摘要：

本文以聚偏氟乙烯（PVDF）和苯乙烯-马来酸酐钠盐（SMA钠盐）为原料进行共混，经热致相分离技术制备“PVDF/SMA钠盐”中空纤维共混超滤膜，重点考察SMA钠盐的添加量对铸膜液体系成膜过程、膜微结构、亲水性和渗透性能的影响规律。结果表明，随着SMA钠盐添加量的增加，膜截面由球上带网结构逐渐转变为蜂窝孔结构，表明SMA钠盐具有非稀释剂的功效。同时，SMA钠盐与PVDF链段之间发生缠结并沉积在固化的PVDF表面以及膜孔内部，阻碍了PVDF的结晶而降低了膜外皮层厚度，并且提高了膜表面的致密度、荷电性、亲水性，从而提高了渗透性能。当PVDF/SMA钠盐质量比为5/1时，膜纯水渗透率为128.4 Lm-2h-1bar-1，对牛血清蛋白（BSA）的截留率高达96.1%，渗透率恢复率为84.2%。

In this work, polyvinylidene fluoride (PVDF) and styrene-co-maleic anhydride-Na (SMA-Na) were used to prepare PVDF/SMA-Na ultrafiltation membrane. The influence of SMA-Na on the membrane formation process，microstructure regulation, hydrophilicity and permeability was investigated. The results showed that with the increase of SMA-Na, the microstructure changed from network on spherulite to cellular pore, which indicated the non-dilute function of SMA-Na. In addition, the entanglement of segments between PVDF and SMA-Na and its deposition on both PVDF matrix and the inside of pore hindered the PVDF crystallization, decreased the thickness of skin-layer, and at the same time increased the density of skin-layer, charge and hydrophilicity. They all increased the permeability. When the mass ratio of PVDF/SMA-Na is 5/1, the pure water permeability reached 128.4 Lm-2h-1bar-1，the rejection of BSA is as high as 96.1% and permeability recovery rate is 84.2%.

基金项目：

国家自然科学基金项目（21978213，21576209）。

作者简介：

武志国（1989-），男，山西太原人，硕士，从事聚合物分离膜及染料废水处理研究

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