Troger's base polymeric membranes for CO2 separation: a review

Abstract

Membrane-mediated separation has gained significant attention as a promising strategy for CO₂ separation. The continuous quest for membrane materials with improved CO₂ separation performance remains a priority in advancing membrane gas separation technologies. Troger's base (TB), characterized by its rigid V-shaped bridged bicyclic linking group, presents an excellent building block for enhancing polymer rigidity and hindering chain packing, thereby improving the gas separation performance. Despite considerable progress which has been made on TB polymeric membranes over the past few years, a comprehensive review on this topic is still lacking. Herein, the development of membranes based on TB polymers for CO₂ separation in the past ten years is summarized and discussed. Specifically, pure TB polymeric membranes, functionalized TB polymeric membranes, TB polymer based mixed-matrix membranes (MMMs), and TB polymer based carbon molecular sieve (CMS)/thermal rearranged (TR) membranes are discussed, targeting separation performance. Finally, conclusions are drawn on the progress of CO₂ separation membranes based on TB polymers, with perspectives for future development also presented.