Thermal rearranged poly(benzoxazole-co-imide) membranes for CO2 separation

Abstract

The thermal rearrangement of α-hydroxyl-polyimide membranes improves gas permselectivity properties compared to the polyimide precursor. By introducing segments within the polymer that do not undergo thermal rearrangement, the gas separation properties of the thermally rearranged membrane can be modified. In particular, polyimides are a class of polymer that have wide gas separation performance, which can be incorporated into thermal rearranged membranes through random copolymers and enable tailoring of the gas separation properties of the resulting membrane, without the need to alter the thermal rearranged moieties. A range of polyimide copolymers based on 4,4'-hexafluoroisopropylidene diph..