Mixed matrix membranes (MMMs) played a promising role in gas separation. However, the trade‐off between permeability and selectivity is still a challenge for its commercial application. Rational design of the inorganic filler, compatibility of filler with the polymer, and dispersion of filler into the polymer have a significant influence on the morphology and separation performance of a membrane. In this study, in order to produce defect‐free flat sheet MMMs, two different solvents (N‐methyl‐2‐pyrrolidone and ethanol/water) were investigated to maximize the dispersion of filler (multi‐walled carbon nanotubes, MWCNTs) in Pebax. The prepared membranes were characterized by scanning electron microscope (SEM), Fourier‐transform infrared spectroscopy (FTIR), and X‐ray diffraction (XRD) analysis. CO₂/N₂ permeation tests were undertaken to investigate the solvent effect on membrane permeation properties. The result showed that membranes fabricated with higher molar volume solvent were more efficient for CO₂ separation. Considering the trade‐off between different parameters (molar volume of solvent, fraction‐free volume, crystallinity of membranes), the permeability and CO₂/N₂ selectivity of Pebax/MWCNTs MMMs was optimized to 405 Barrer and 51, respectively. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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Pebax / MWCNTs-NH2混合基质膜可增强CO2 / N2分离

混合基质膜（MMM）在气体分离中起着有希望的作用。但是，渗透性和选择性之间的权衡仍然是其商业应用的挑战。无机填料的合理设计，填料与聚合物的相容性以及填料在聚合物中的分散性均对膜的形态和分离性能产生重大影响。在这项研究中，为了生产无缺陷的平板MMM，对两种不同的溶剂（N-甲基-2-吡咯烷酮和乙醇/水）进行了研究，以使填充剂（多壁碳纳米管，MWCNT）在Pebax中的分散度最大化。 。制备的膜通过扫描电子显微镜（SEM），傅立叶变换红外光谱（FTIR）和X射线衍射（XRD）分析进行表征。CO ₂ / N ₂进行渗透测试以研究溶剂对膜渗透性能的影响。结果表明，用较高摩尔体积的溶剂制备的膜对CO _2的分离效率更高。考虑到不同参数（溶剂的摩尔体积，无馏分的体积，膜的结晶度）之间的权衡，将Pebax / MWCNTs MMM的渗透率和CO ₂ / N ₂选择性分别优化为405 Barrer和51。©2020年化学工业协会和John Wiley＆Sons，Ltd.