Membrane separation is gaining great attention in many applications, especially in gas separation. Polysulfone (PSF) is the most widely studied polymeric membrane material for CO₂ in its pure or modified state. Ionic liquids supported membrane technology (SILMs) are now widely applied due to their unique properties at room temperatures. In our previous study, we proved the enhanced ability of ionic liquid enhanced PSF for the separation of CO₂ from gas streams. In this study, the dielectric measurements (BDS) extending up to 107 Hz for different concentrations of ionic liquid into PSF matrix, are presented. Thermogravimetric analysis measurement (TGA), differential scanning calorimeter (DSC), dynamic mechanical analysis, and the tensile properties of the membranes are studied in order to optimize the efficiency of separating CO₂ from CO₂/N₂ mixture and CO₂/CH₄. TGA showed that pure PSF is a highly thermostable polymer, of which the 5% weight loss temperature is above 150°C. DSC traces show that the T_g of PSF was 149.5°C and decreases gradually for the composites. This behavior was confirmed with BDS analyses, which also revealed important information about the chain motions dynamics and the fragility index. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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聚砜/二异丙胺1-烷基-3-甲基咪唑鎓离子液体膜的表征：高压气体分离应用

在许多应用中，尤其是在气体分离中，膜分离正受到广泛关注。聚砜（PSF）是研究最广泛的纯净或改性CO ₂聚合物膜材料。离子液体支持膜技术（SILMs）由于其在室温下的独特性能而被广泛应用。在我们之前的研究中，我们证明了离子液体增强PSF分离CO _2的能力增强来自气流。在这项研究中，介绍了将不同浓度的离子液体注入PSF基质时的介电测量（BDS）可以扩展到107 Hz。为了优化从CO ₂ / N ₂混合物和CO ₂ / CH ₄中分离出CO ₂的效率，研究了热重分析测量（TGA），差示扫描量热仪（DSC），动态力学分析和膜的拉伸性能。。TGA表明纯PSF是高度热稳定的聚合物，其5％的失重温度高于150℃。DSC迹线表明T _gPSF的峰值为149.5°C，复合材料逐渐降低。BDS分析证实了这一行为，该分析还揭示了有关链运动动力学和脆性指数的重要信息。©2020年化学工业协会和John Wiley＆Sons，Ltd.