Highly Permeable Mixed Matrix Membranes of Thermally Rearranged Polymers and Porous Polymer Networks for Gas Separations

Mixed matrix membranes (MMMs) have been obtained by blending an aromatic ortho-hydroxypolyimide (PIOH) or ortho-acetylpolyimide (PIOAc) with different loading amounts (15 and 30 wt %) of a microporous polymer network (PPN), which was from the reaction triptycene isatin. The excellent thermal resistance PPN (above 500 °C) allowed it to be used as filler successfully prepare thermally rearranged polybenzoxazole (TR-PBO)-MMMs treatment above MMMs. Moreover, showed relatively good compatibility polyimide matrix, improved TR-PBO formation. gas separation performances these MMMs before after process were studied for five representative gases (He, O2, N2, CO2, CH4). For derived ortho-functional polyimides, permeability considerably increased all gases, whereas selectivity pairs, such CO2/N2 CO2/CH4, remained similar. Thus, selectivity-permeability performance PIOH- PIOAc-MMMs containing % (PIOH30 PIOAc30) surpassed 1991 Robeson limit CO2/CH4 pair. In case TR-PBO-MMMs (TROH TROAc-MMMs), rearrangement led increase in permeability, showing values much better than those observed material employed MMM matrix. little bit lower pristine membranes. CO2 TROAc30 1036 barrer 28, surpassing 2008 limit.