To mitigate the effect of atmospheric CO₂ on global climate change, gas separation materials that simultaneously exhibit high CO₂ permeability and selectivity in gas mixtures must be developed. In this study, CO₂ transport through midblock-sulfonated block polymer membranes prepared from four different solvents is investigated. The results presented here establish that membrane morphology and accompanying gas transport properties are sensitive to casting solvent and relative humidity. We likewise report an intriguing observation: submersion of these thermoplastic elastomeric membranes in liquid water, followed by drying prior to analysis, promotes not only a substantial change in membrane morphology, but also a significant improvement in both CO₂ permeability and CO₂/N₂ selectivity. Measured CO₂ permeability and CO₂/N₂ selectivity values of 482 Barrer and 57, respectively, surpass the Robeson upper bound, indicating that these nanostructured membranes constitute promising candidates for gas separation technologies aimed at CO₂ capture.

为了减轻大气中的CO ₂对全球气候变化的影响，必须开发同时在气体混合物中表现出高CO ₂渗透性和选择性的气体分离材料。在这项研究中，研究了CO ₂通过由四种不同溶剂制备的中嵌段磺化嵌段聚合物膜的传输。此处给出的结果证实，膜的形态和伴随的气体传输特性对浇铸溶剂和相对湿度敏感。我们同样报告了一个有趣的观察结果：将这些热塑性弹性体膜浸入液态水中，然后在分析之前进行干燥，不仅会促进膜形态的实质性变化，而且还会显着改善两种CO ₂渗透率和CO ₂ / N ₂选择性。测得的482 Barrer和57的CO ₂渗透率和CO ₂ / N ₂选择性值分别超过了Robeson上限，表明这些纳米结构的膜构成了针对气体捕集技术的有希望的候选物，旨在进行CO ₂捕集。