全聚离子液体多孔膜中反阴离子疏水性的微调
Fine Tuning Hydrophobicity of Counter-Anions to Tailor Pore Size in Porous All-Poly(ionic liquid) Membranes
摘要：
荷电多孔聚合物膜（CPMs）作为一种在化学、材料科学和生物医学等领域具有广泛应用前景的多功能膜，引起了人们的广泛关注。可控地制造CPM对于优化其功能和最大化其实用价值具有特别重要的意义。在此，我们报告的制造CPM完全从聚（离子液体）（PIL），和他们的孔径和润湿性精确定制的抗衡阴离子的合理选择。具体地，通过延长氟化烷基取代基的长度，即从双（三氟甲烷磺酰基）酰亚胺（Tf 2N）到双（五氟乙烷磺酰基）酰亚胺（Pf2N）和双（七氟丙烷磺酰基）酰亚胺（Hf2N），反阴离子的疏水性逐步细微增加，平均孔径分别从1546 nm逐渐减小到157 nm和77 nm。与此同时，它们的水接触角从90 °增大到102 °和120 °。通过阴离子疏水性的系统变化对CPM的多孔结构和表面润湿性的精细控制提供了PIL阴离子对CPM结构的影响的坚实证据。
英文摘要：
Charged porous polymer membranes (CPMs) emerging as a multifunctional platform for diverse applications in chemistry, materials science, and biomedicine have been attracting widespread attention. Fabrication of CPMs in a controllable manner is of particular significance for optimizing their function and maximizing practical values. Herein, we report the fabrication of CPMs exclusively from poly(ionic liquid)s (PILs), and their pore size and wettability were precisely tailored by rational choice of the counteranions. Specifically, stepwise subtle increase in hydrophobicity of the counteranions by extending the length of fluorinated alkyl substituents, i.e. from bis(trifluoromethane sulfonyl)imide (Tf2N) to bis(pentafluoroethane sulfonyl)imide (Pf2N) and bis(heptafluoropropane sulfonyl)imide (Hf2N), decreases the average pore size gradually from 1546 nm to 157 nm and 77 nm, respectively. Meanwhile, their corresponding water contact angles increased from 90 degree to 102 degree and 120o. The exquisite control over the porous architectures and surface wettability of CPMs by systematic variation of the anion's hydrophobicity provides a solid proof of the impact of the PIL anions on CPMs' structure.
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