Ionic liquids (ILs) with high CO₂ affinity are highly sought after materials for developing high performance membranes for CO₂ separation. For the first time, a styrene-based IL (S-IL) monomer was synthesized and coated on the external surface of a styrene butadiene copolymer-derived hollow fiber substrate by UV polymerization to form cross-linked, poly(S-IL) hollow fibers, and developed a defect-free selective layer. The polymerization parameters, including the precursor/initiator molar ratio and reaction time, were systematically investigated to optimize the polymerization conditions, and their effects on the separation performances of CO₂ and N₂ single gas and their gas mixtures. The CO₂/N₂ selectivity of the poly(S-IL) hollow fiber membranes increased from 1 to 29 reaching a final CO₂ permeance of 3.6 GPU with increasing the precursor/initiator molar ratio and the polymerization reaction time. However, the CO₂ permeance of poly(S-IL) hollow fiber membranes was decreased obviously from 6.4 to 2.9 when the initiator was increased from 1 to 2 wt% for polymerization process. Upon increasing testing temperature (30 °C–70 °C) for the binary gas test, the gas permeance increased two folds from 1.8 to 3.5 GPU (CO₂) and from 0.07 to 0.17 GPU (N₂). The CO₂/N₂ selectivity of 35 was highest at 50 °C, due to an increased in the polymer chain mobility which promoted gas transport.

具有高 CO ₂亲和力的离子液体 (IL)是开发用于 CO ₂分离的高性能膜的材料。首次合成了苯乙烯基IL（S-IL）单体，并通过UV聚合将其包覆在苯乙烯-丁二烯共聚物衍生的中空纤维基材的外表面上，形成交联的聚（S-IL）中空纤维。纤维，并开发了一个无缺陷的选择层。系统地研究了聚合参数，包括前体/引发剂摩尔比和反应时间，以优化聚合条件，及其对 CO ₂和 N ₂单一气体及其气体混合物的分离性能的影响。CO ₂ /N ₂随着前体/引发剂摩尔比和聚合反应时间的增加，聚（S-IL）中空纤维膜的选择性从 1 增加到 29，最终 CO ₂渗透率为 3.6 GPU。然而，当聚合过程中引发剂从1wt%增加到2wt%时，聚（S-IL）中空纤维膜的CO ₂渗透率从6.4明显降低到2.9。在增加二元气体测试的测试温度 (30 °C–70 °C) 后，气体渗透率从 1.8 到 3.5 GPU (CO ₂ ) 和从 0.07 到 0.17 GPU (N ₂ )增加了两倍。CO ₂ /N ₂选择性为 35 在 50 °C 时最高，这是由于聚合物链流动性的增加促进了气体传输。