Polymeric membranes, especially polyimide membranes, are widely preferred in gas separation processes due to their superior properties such as inherently high permeability, selectivity, and easy processing. Zeolitic imidazolate frames (ZIFs) are crystalline porous materials exhibiting some unique properties, such as tunable pore sizes, thermal and chemical stability.

In this study, a series of polyimide/ZIF-95 mixed matrix membranes (MMMs) were prepared by solution casting method and their structural, thermal, thermomechanical, and permselectivity properties were characterized in detail, by XRD, FTIR, SEM, DLS, DMA, BET surface area and gas permeability measurements. In the first step, ZIF-95 powder was synthesized and characterized then incorporated into polyimide (Matrimid®5218) matrix as the loading amounts of 10, 20, and 30 wt%. SEM analysis showed that ZIF particles were homogeneously distributed into polyimide matrix and there were no agglomeration and cracking and visible holes at interfaces between polymer and filler. Increase in storage modulus of MMMs also implied such strong interfacial interactions between polyimide and ZIF-95 particles. It was found that both permeability and selectivity of CO₂, CH₄, and H₂ gases increased with the increasing of ZIF-95 amount in polymer matrix. The maximum ideal separation factors for the CO₂/CH₄ and H₂/CH₄ were found to be 58.0 and 192.0, respectively. These values are significantly higher than the ideal separation factor of Matrimid®5218. It was also found that the Matrimid®/ZIF-95 (70/30) membrane showed improvement in gas selectivity by 75% and 48% for the CO₂/CH₄ and H₂/CH₄, respectively. Consequently, this study suggests a manufacturing route for MMMs having superior properties and improved permselectivity performances and reports their structure-property relations for potential gas separation, particularly CO₂ and/or natural gas purification, processes.

聚合物膜，特别是聚酰亚胺膜，由于其优越的性能，例如固有的高渗透性，选择性和易于加工，在气体分离过程中被广泛优选。沸石咪唑酸盐骨架（ZIF）是结晶的多孔材料，具有某些独特的特性，例如可调节的孔径，热和化学稳定性。

在这项研究中，通过溶液浇铸法制备了一系列聚酰亚胺/ ZIF-95混合基质膜（MMM），并通过XRD，FTIR，SEM，DLS，DMA详细表征了它们的结构，热，热机械和渗透选择性。 ，BET表面积和气体渗透率测量。第一步，合成ZIF-95粉末并进行表征，然后以10、20和30 wt％的负载量将其掺入聚酰亚胺（Matrimid®5218）基质中。扫描电镜分析表明，ZIF颗粒均匀分布在聚酰亚胺基体中，在聚合物与填料的界面无团聚，开裂和可见孔。MMM储能模量的增加也暗示了聚酰亚胺和ZIF-95颗粒之间的这种强界面相互作用。发现CO的渗透性和选择性₂，CH ₄和H _2种气体与ZIF-95的量在聚合物基质中的增加而增加。发现CO ₂ / CH ₄和H ₂ / CH ₄的最大理想分离系数分别为58.0和192.0。这些值明显高于Matrimid®5218的理想分离系数。还发现，Matrimid®/ ZIF-95（70/30）膜对CO ₂ / CH ₄和H ₂ / CH _4的气体选择性提高了75％和48％。， 分别。因此，该研究提出了具有优异性能和改进的选择性渗透性能的MMM的生产路线，并报告了其用于潜在气体分离，特别是CO ₂和/或天然气纯化工艺的结构-性质关系。