Abstract Membranes with zwitterionic surfaces are highly desired in water-based separations for their distinguished fouling resistance. Herein, a facile strategy for the preparation of zwitterion-functionalized membranes is developed by coupling the pore-making and zwitterion functionalization in one step. We soaked thin films of poly (2-dimethylaminoethyl methacrylate)-block-polystyrene (PDMAEMA-b-PS) in the mixture of ethanol and 1, 3-propanesultone (1, 3-PPST). In this mixture, PDMAEMA microdomains were selective swollen leading to nanoporous structures with PDMAEMA chains enriched on the surface. Simultaneously, the quaternization reaction between PDMAEMA and 1, 3-PPST took place. Unexpectedly, in addition to function as the zwitterionic agent, 1, 3-PPST also contributed to the selective swelling induced pore generation. It was found that the presence of 1, 3-PPST in ethanol slowed down the swelling process at the early stage, but evidently enhanced the swelling of PDMAEMA-b-PS films in longer duration. Thus-prepared zwitterion-functionalized membranes exhibited several times higher water permeance than non-zwitterionized counterparts, which should be attributed to increased pore size and strongly improved hydrophilicity as a result of zwitterion functionalization. Moreover, the membranes showed exceptional fouling resistance because of the presence of zwitterions.

中文翻译：

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用于防污超滤膜的嵌段共聚物的同步两性离子化和选择性溶胀致孔生成

摘要 具有两性离子表面的膜因其卓越的抗污染性而在水基分离中非常受欢迎。在此，通过将造孔和两性离子功能化一步耦合，开发了一种制备两性离子功能化膜的简便策略。我们将聚（2-二甲基氨基乙基甲基丙烯酸酯）-嵌段聚苯乙烯（PDMAEMA-b-PS）薄膜浸泡在乙醇和 1, 3-丙烷磺内酯（1, 3-PPST）的混合物中。在这种混合物中，PDMAEMA 微区被选择性溶胀，形成了表面富集 PDMAEMA 链的纳米多孔结构。同时，PDMAEMA 与 1, 3-PPST 发生季铵化反应。出乎意料的是，除了作为两性离子试剂外，1, 3-PPST 还有助于选择性溶胀诱导的孔生成。发现乙醇中1, 3-PPST的存在在早期减缓了溶胀过程，但在更长的持续时间内明显增强了PDMAEMA-b-PS膜的溶胀。由此制备的两性离子功能化膜表现出比非两性离子化膜高几倍的水渗透性，这应该归因于由于两性离子功能化而增加的孔径和大大提高的亲水性。此外，由于两性离子的存在，膜表现出优异的抗污染性。这应该归因于由于两性离子官能化而增加的孔径和大大提高的亲水性。此外，由于两性离子的存在，膜表现出优异的抗污染性。这应该归因于由于两性离子官能化而增加的孔径和大大提高的亲水性。此外，由于两性离子的存在，膜表现出优异的抗污染性。