Polymer nanosieve membranes for CO₂-capture？applications

다국어 초록 (Multilingual Abstract)

Microporous organic polymers (MOPs) are of potential significance for gas storage, gas separation and low-dielectric applications. Among many approaches for obtaining such materials, solution-processable MOPs derived from rigid and contorted macromolecular structures are promising because of their excellent mass transport and mass exchange capability. Here we show a class of amorphous MOP, prepared by [2+3] cycloaddition modification of a polymer containing an aromatic nitrile group with an azide compound, showing super-permeable characteristics and outstanding CO<SUB>2</SUB> separation performance, even under polymer plasticization conditions such as CO<SUB>2</SUB>/light gas mixtures. This unprecedented result arises from the introduction of tetrazole groups into highly microporous polymeric frameworks, leading to more favourable CO<SUB>2</SUB> sorption with superior affinity in gas mixtures, and selective CO<SUB>2</SUB> transport by presorbed CO<SUB>2</SUB> molecules that limit access by other light gas molecules. This strategy provides a direction in the design of MOP membrane materials for economic CO<SUB>2</SUB> capture processes.