Preparation of mixed matrix membranes (MMMs) with appropriate separation efficiency requires tenacious interfacial affinity between filler particles and polymer matrix. In this work, Cu-BTC particles with two structures of size-reduced and needle were successfully synthesized via the three-layer synthesis approach and combined with Matrimid to prepare MMMs for helium separation. Extensive characterization of particles (XRD, SEM, TGA, FTIR and N sorption) and membranes (SEM, TGA, DSC and density-FFV measurements) were performed to gain insight in the membranes separation behavior.Then gas separation performance of membranes were examined for the single gases He, CH and N and the gas mixtures He/CH and He/N. The combination of MOFs with Matrimid resulted in an increase in T, density and degradation behavior of MMMs indicating a good compatibility between the fillers and polymer, however this development is more pronounced for reduced particles. The MMMs containing size-reduced MOF had premiere gas separation performance in comparison with the needle particles and overcame the 1991 Robeson upper bond.The MMM at 40 wt% loading exhibited the best efficiency with Hepermeability of 66.4Barrer which is about three times more than pure Matrimid. In addition, the improvements in He/CH and He/Nideal selectivities were 181 and 169%, respectively. Mixed gas permeability measurements showed that helium permeability values and also selectivities decreased slightly compared to single gas data due to the competitive effects between large gases of CH and N with small helium.

中文翻译：

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通过 Matrimid 基质中尺寸减小的 Cu-BTC 颗粒强化从 CH4 和 N2 中分离氦气


制备具有适当分离效率的混合基质膜（MMM）需要填料颗粒和聚合物基质之间具有顽强的界面亲和力。本工作通过三层合成方法成功合成了具有尺寸减小和针状两种结构的Cu-BTC颗粒，并与Matrimid结合制备了用于氦气分离的MMM。对颗粒（XRD、SEM、TGA、FTIR 和 N 吸附）和膜（SEM、TGA、DSC 和密度-FFV 测量）进行了广泛的表征，以深入了解膜的分离行为。然后检查膜的气体分离性能单一气体 He、CH 和 N 以及气体混合物 He/CH 和 He/N。 MOF 与 Matrimid 的组合导致 MMM 的 T、密度和降解行为增加，表明填料和聚合物之间具有良好的相容性，但对于减少的颗粒，这种发展更为明显。与针状颗粒相比，含有尺寸减小的 MOF 的 MMM 具有出色的气体分离性能，并克服了 1991 Robeson 上键。40 wt% 负载量的 MMM 表现出最佳效率，Hepermeability 为 66.4Barrer，大约是纯 MMM 的三倍圣母玛利亚。此外，He/CH 和 He/Nideal 选择性分别提高了 181% 和 169%。混合气体渗透率测量表明，由于 CH 和 N 等大气体与小氦气之间的竞争效应，与单一气体数据相比，氦气渗透率值和选择性略有下降。