Gas permeation parameters of mixed matrix membranes based on the polymer of intrinsic microporosity PIM-1 and the zeolitic imidazolate framework ZIF-8

► Preparation of a new type of mixed matrix membranes (MMM) based on PIM-1 and ZIF-8. ► Increase in permeability and separation factors of MMM with increase in the content of ZIF-8. ► Sorption isotherms of CO2 in MMM with varying content of ZIF-8. ► Increase in free volume due to the introduction of ZIF-8 into PIM-1 matrix. ► Robeson diagrams: the data points of various PIM-1/ZIF-8 compositions are above the upper bounds for different gas pairs.