Cross-Linked Poly(ethylene oxide) Ion Gels Containing Functionalized Imidazolium Ionic Liquids as Carbon Dioxide Separation Membranes,Industrial & Engineering Chemistry Research

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Cross-Linked Poly(ethylene oxide) Ion Gels Containing Functionalized Imidazolium Ionic Liquids as Carbon Dioxide Separation Membranes
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-08-20 , DOI: 10.1021/acs.iecr.8b02739
Victor A. Kusuma _{1,

2} , Megan K. Macala _{1,

2} , James S. Baker ₁ , David Hopkinson ₁

Affiliation

1,3-Substituted imidazolium bis(trifluoromethylsulfonyl)imide (Tf₂N) ionic liquids (ILs) were incorporated at 40 and 60 vol % loading into a cross-linked poly(ethylene oxide) polymer network to create ion gels for carbon dioxide (CO₂)-selective gas separation membranes. The ILs plasticize the poly(ethylene oxide)-based polymer to increase its gas permeability. Compared to the base polymer, with a CO₂ permeability of 145 barrer and a CO₂ against nitrogen (N₂) selectivity of 47, the highest CO₂ permeability achieved was 530 barrer coupled with a CO₂/N₂ selectivity of 31 by having 60 vol % [1-ethyl-3-methylimidazolium][Tf₂N]. The extent of gas permeability improvement depends on the cation’s terminal substituent. Substituents that promote additional noncovalent intermolecular interactions, such as hydroxyl, benzyl, and nitrile, can reduce the gas diffusivity by reducing the polymer chain mobility. While n-alkyl, branched alkyl, and oligo(ethylene glycol) substituents can significantly increase the gas permeability, the shortest substituents (such as ethyl) were the most effective because they promote high ionic charge density.

中文翻译：

含有功能化咪唑离子液体作为二氧化碳分离膜的交联聚环氧乙烷离子凝胶

将1,3-取代的咪唑鎓双（三氟甲基磺酰基）酰亚胺（Tf ₂ N）离子液体（ILs）以40和60体积％的量掺入到交联的聚（环氧乙烷）聚合物网络中，以生成二氧化碳的离子凝胶（ CO ₂）-选择性气体分离膜。IL增塑了聚环氧乙烷基聚合物，以提高其气体渗透性。与基础聚合物相比，CO ₂渗透性为145 barrer，CO ₂对氮（N ₂）的选择性为47，获得的最高CO ₂渗透性为530 barrer，而CO ₂ / N _2的选择性为31 60体积％[1-乙基-3-甲基咪唑] [Tf₂ N]。气体渗透性改善的程度取决于阳离子的末端取代基。促进其他非共价分子间相互作用的取代基，例如羟基，苄基和腈，可通过降低聚合物链的迁移率来降低气体扩散性。尽管正烷基，支链烷基和低聚（乙二醇）取代基可以显着提高气体渗透性，但最短的取代基（如乙基）是最有效的，因为它们可促进高离子电荷密度。

更新日期：2018-08-20

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