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两性离子聚合物功能化改性聚偏氟乙烯（PVDF）膜及其性能研究

作者：周晓吉¹，²，³，刘天澍¹，²，孙一卓¹，²，程莹¹，²，白仁碧¹，²，³

单位： 1 苏州科技大学分离净化材料与技术研发中心，苏州，215009 2 苏州科技大学环境科学与工程学院，苏州，215009 3 江苏省水处理技术与协同创新中心，苏州，215009

关键词：两性离子聚合物，改性PVDF膜，抗污染性

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2021,41(4):84-92

摘要：

通过活性自由基聚合从羧酸甜菜碱丙烯酸甲酯（CBMA）和苯乙烯（St）制备了一种含有两性离子的聚合物P(Stx-co-CBMAy)，并将其作为添加剂，采用浸没沉淀相转化法（NIPS）制备了改性聚偏氟乙烯（PVDF）膜，并对膜性能进行测试研究。通过ATR-FTIR及XPS分析，改性膜表面出现两性离子聚合物的富集。两性离子的加入对膜的微观结构包括表面及断面结构具有明显的影响，改性膜的孔隙率及膜厚具有明显的增加。两性离子聚合物的加入改变了膜表面电荷分布，膜的等电点升高，对膜的抗污染性能具有一定的影响。改性膜在静态吸附条件下在pH=5.3时对1.0 g/L BSA和LYZ的吸附量具有明显的降低，具有优异的抗污染性能。改性膜对BSA和SA进行动态过滤，研究表明改性膜M-P1对BSA及SA的污染大部分为可逆污染，膜具有较高的通量恢复率。

A zwitterion polymer P(Stx-co-CBMAy) was obtained from carboxylic betaine methyl acrylate (CBMA) and styrene (St) by reactive radical polymerization. The modified PVDF membranes were prepared by immersion precipitate phase transformation (NIPS) with addition of polymer and the properties of the membrane were tested and studied. By anylasis of ATR-FTIR and XPS, the zwitterion polymers were enriched on the surface of the modified membrane which obviously affected membrane microstructure includes surface and section structure. The porosity and thickness of the modified membrane increased obviously. The membranes surface charge distribution were changed and the isoelectric point increases due to the addition of zwitterion polymer, which has a certain effect on the anti-fouling performance of the membrane. Under the condition of static adsorption, the adsorption capacity of 1.0 g/L BSA and LYZ solution at pH=5.3 by modified membrane was significantly reduced showing excellent anti-fouling performance. Dynamic filtration experiments of BSA and SA showed that most of the pollution of modified membranes M-P1 to BSA and SA was reversible, and the flux recovery rate of the modified membranes maintained a high level.

基金项目：

江苏水处理技术与材料协同创新中心预研项目（XTCXSZ2019-4）苏州分离净化材料与技术重点实验室（SZS201512）

作者简介：

周晓吉（1988- ），女，硕士研究生，实验师，研究方向为高分子材料的制备及其对膜的改性。

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