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Thin‐Film Composite Polyionic Liquid Gel Membranes and Their Potential for Nanofiltration in Organic Solvents
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-09-19 , DOI: 10.1002/admi.201800823 Salem Al-kharabsheh 1 , Roy Bernstein 1
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-09-19 , DOI: 10.1002/admi.201800823 Salem Al-kharabsheh 1 , Roy Bernstein 1
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Polymeric ionic liquid (PIL) gels can serve as a promising material for the fabrication of solvent resistance nanofiltration (SRNF) membranes, given the solubility and the high delocalization of the counterion of PILs in organic solvents. This research describes the fabrication of a new thin‐film composite membrane (TFC) with a crosslinked PIL (i.e., PIL gel) as an active layer and demonstrates its great potential as an SRNF membrane. A hydrophobic and positively charged thin‐film PIL gel (100–400 nm) is successfully grafted onto a polyethersulfone membrane. The grafting degree, surface charge, and cross‐linker density depend on the grafting conditions. This, it turn, governs the permeability and selectivity of the membranes tested in acetonitrile and ethanol solutions, good and poor solvents for the grafted PIL gel, respectively. These changes are attributed to the trade‐off between the membrane surface properties in the two solvents. In particular, the membrane that has a high grafting degree, surface charge, and cross‐linker density yields high permeance and rejection in acetonitrile. Furthermore, the membrane performance is stable in ethanol for one week. Due to the wide variety of PIL monomers, TFC membranes with different properties can be developed based on the solvent properties.
中文翻译：
薄膜复合离子液体凝胶膜及其在有机溶剂中纳滤的潜力
考虑到PIL的抗衡离子在有机溶剂中的溶解度和高离域性，聚合物离子液体（PIL）凝胶可作为制造耐溶剂纳米过滤（SRNF）膜的有前途的材料。这项研究描述了一种以交联的PIL（即PIL凝胶）为活性层的新型薄膜复合膜（TFC）的制造方法，并展示了其作为SRNF膜的巨大潜力。将疏水且带正电的薄膜PIL凝胶（100-400 nm）成功接枝到聚醚砜膜上。接枝度，表面电荷和交联剂密度取决于接枝条件。依次决定了在乙腈和乙醇溶液（分别用于接枝的PIL凝胶的好溶剂和差溶剂）中测试的膜的渗透性和选择性。这些变化归因于两种溶剂的膜表面特性之间的权衡。特别是，具有高接枝度，表面电荷和交联剂密度的膜可在乙腈中产生较高的渗透性和截留率。此外，膜性能在乙醇中稳定了一周。由于PIL单体种类繁多，因此可以基于溶剂特性开发出具有不同特性的TFC膜。
更新日期：2018-09-19
中文翻译：
薄膜复合离子液体凝胶膜及其在有机溶剂中纳滤的潜力
考虑到PIL的抗衡离子在有机溶剂中的溶解度和高离域性，聚合物离子液体（PIL）凝胶可作为制造耐溶剂纳米过滤（SRNF）膜的有前途的材料。这项研究描述了一种以交联的PIL（即PIL凝胶）为活性层的新型薄膜复合膜（TFC）的制造方法，并展示了其作为SRNF膜的巨大潜力。将疏水且带正电的薄膜PIL凝胶（100-400 nm）成功接枝到聚醚砜膜上。接枝度，表面电荷和交联剂密度取决于接枝条件。依次决定了在乙腈和乙醇溶液（分别用于接枝的PIL凝胶的好溶剂和差溶剂）中测试的膜的渗透性和选择性。这些变化归因于两种溶剂的膜表面特性之间的权衡。特别是，具有高接枝度，表面电荷和交联剂密度的膜可在乙腈中产生较高的渗透性和截留率。此外，膜性能在乙醇中稳定了一周。由于PIL单体种类繁多，因此可以基于溶剂特性开发出具有不同特性的TFC膜。
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