Min Hyo Jun, Kim Min-Bum, Bae Youn-Sang, Thallapally Praveen K, Lee Jae Hun, Kim Jong Hak
Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352, USA.
Membranes (Basel). 2023 Feb 28;13(3):287. doi: 10.3390/membranes13030287.
Thin-film composite mixed-matrix membranes (TFC-MMMs) have potential applications in practical gas separation processes because of their high permeance (gas flux) and gas selectivity. In this study, we fabricated a high-performance TFC-MMM based on a rubbery comb copolymer, i.e., poly(2-[3-(2H-benzotriazol-2-yl)-4-hydroxyphenyl] ethyl methacrylate)-co-poly(oxyethylene methacrylate) (PBE), and metal-organic framework MOF-808 nanoparticles. The rubbery copolymer penetrates through the pores of MOF-808, thereby tuning the pore size. In addition, the rubbery copolymer forms a defect-free interfacial morphology with polymer-infiltrated MOF-808 nanoparticles. Consequently, TFC-MMMs (thickness = 350 nm) can be successfully prepared even with a high loading of MOF-808. As polymer-infiltrated MOF is incorporated into the polymer matrix, the PBE/MOF-808 membrane exhibits a significantly higher CO permeance (1069 GPU) and CO/N selectivity (52.7) than that of the pristine PBE membrane (CO permeance = 431 GPU and CO/N selectivity = 36.2). Therefore, the approach considered in this study is suitable for fabricating high-performance thin-film composite membranes via polymer infiltration into MOF pores.
薄膜复合混合基质膜（TFC-MMMs）因其高渗透率（气体通量）和气体选择性而在实际气体分离过程中具有潜在应用。在本研究中，我们基于一种橡胶状梳状共聚物，即聚（2-[3-(2H-苯并三唑-2-基)-4-羟基苯基]甲基丙烯酸乙酯）-co-聚（甲基丙烯酸氧乙烯酯）（PBE）和金属有机框架MOF-808纳米颗粒制备了一种高性能TFC-MMM。橡胶状共聚物穿透MOF-808的孔，从而调节孔径。此外，橡胶状共聚物与聚合物渗透的MOF-808纳米颗粒形成无缺陷的界面形态。因此，即使MOF-808负载量很高，也能成功制备出厚度为350nm的TFC-MMMs。由于聚合物渗透的MOF被掺入聚合物基质中，PBE/MOF-808膜表现出比原始PBE膜（CO渗透率=431 GPU，CO/N选择性=36.2）显著更高的CO渗透率（1069 GPU）和CO/N选择性（52.7）。因此，本研究中考虑的方法适用于通过聚合物渗透到MOF孔中来制备高性能薄膜复合膜。
