Isoporous integral asymmetric membranes derived from the self‐assembly of block copolymers combined with the non‐solvent‐induced phase separation (SNIPS) have gained great attention. To extend their utility, good control over pore size and surface functionality in a facile manner is highly desirable. Here, an approach is proposed to achieve this by quaternization of the poly(4‐vinylpyridine) moiety of a polystyrene‐block‐poly(4‐vinylpyridine) SNIPS membrane using alkyl iodides via a scalable gas‐solid heterogeneous reaction. By changing the size of the alkyl groups of the quaternization agent and the degree of quaternization, the effective pore size of the membrane is tailored in a wide range from the ultrafiltration to the nanofiltration regime. A quaternization of approximately half of the 4VP repeating units of the membranes with methyl iodide, ethyl iodide, or 1‐propyl iodide leads to a retention of methylene blue from a 10 mg L⁻¹ aqueous solution of 96%, 87%, and 83%, respectively.

中文翻译：

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聚苯乙烯嵌段聚（4-乙烯基吡啶）多孔膜的季铵化：调整孔径和电荷密度的一种方法

嵌段共聚物自组装与非溶剂诱导相分离（SNIPS）结合产生的等孔整体不对称膜受到了广泛关注。为了扩展其实用性，非常需要以容易的方式良好地控制孔径和表面功能。在这里，提出了一种通过对聚苯乙烯嵌段的聚（4-乙烯基吡啶）部分进行季铵化来实现此目的的方法通过可扩展的气固非均相反应使用烷基碘的聚（4-乙烯基吡啶）SNIPS膜 通过改变季铵化剂的烷基的大小和季铵化的程度，可以在从超滤到纳滤范围的宽范围内调整膜的有效孔径。膜的4VP重复单元中约有一半用甲基碘，乙基碘或1-丙基碘进行季铵化可从10 mg L ^-1的96％，87％和83 mg水溶液中保留亚甲基蓝％， 分别。