fig4

Figure 4. PFPIM membrane for gas separations. (A) Schematic representing the structure of TZPIMs; (B) The position of TZPIMs and other membranes at the upper bound of CO₂/N₂ separation; (C) The CO₂ adsorption isotherms of PIM-1 and TZPIMs^[53]; (D) Scheme of the in-situ generated polymer molecular sieves within a PFPIMs based blending membrane; (E and F) The gas permeability and ideal gas selectivity of the blending membrane^[84]; (G) Scheme of the hydrogen bond interface design in PFPIMs based mixed matrix membrane; (H) The wavenumber shifts of O-H stretching vibration with temperature; (I) The CO₂/CH₄ performance of PFPIMs-based mixed matrix membrane in comparison with Robeson upper bound^[92]. PFPIM: Polar groups-functionalized polymers of intrinsic microporosity; TZPIMs: tetrazole-functionalized polymers of intrinsic microporosity; PIM: polymers of intrinsic microporosity.