A Facilitated Gas Transport Strategy: 3D Porous Hyper-crosslinked Polymers Incorporating 6FDA-based Polyimide Matrix for the Design and Fabrication of Mixed Matrix Membranes with High Permeability

Economic membrane technologies are a perennial hot topic in the field of natural gas purification and O 2 enrichment. In this work, novel hyper cross-linked polymers (HCPs) incorporating 6-FDA based polyimide (PI) MMMs were prepared via a casting method for enhancing different gas transport (CO 2 , CH 4 , O 2 , and N 2 ). The gas permeation experiments showed that compared with pure PI films, adding HCPs effectively promotes gas transport, increases gas permeability, and maintains ideal selectivity. The permeability of HCPs/PI MMMs toward CO 2 and O 2 was as high as 105.85 barrer and 24.03 barrer, respectively, and the ideal selectivity of CO 2 /CH 4 and O 2 /N 2 was 15.67 and 3.00, respectively. Molecular dynamic simulations further verified that adding HCPs was beneficial to gas transport thanks to large FFV of MMMs. Thus, HCPs have potential utility in the fabrication of MMMs for facilitating gas transport in the field of natural gas purification and O 2 enrichment.