Tunable 6FDA-Based PI Graft Copolymer for Enhanced CO<sub>2</sub> Separation with Microphase Separation
발표자
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초록
내용
Polymer-based gas separation membranes are cost-effective and versatile but face a trade-off between permeability and selectivity, constrained by the Robeson upper bound. Recent research focuses on developing functional copolymers with both hard and soft segments to balance mechanical stability and gas transport. Block and graft copolymers use microphase separation to enhance separation efficiency. Polyimides, especially those based on 6FDA, are favored for their excellent mechanical stability and gas transport properties. 6FDA-based PIs benefit from low-density chain packing and bulky trifluoromethyl groups, which improve gas permeation. Modifications with functional block moieties, such as carboxylate groups in 6FDA-DAM, further tune properties. This study introduces a novel 6FDA-based PI graft copolymer, PI-POEM, which combines 6FDA-DAM with POEM side chains. This design enhances CO2 affinity and features a microphase-separated structure that optimizes gas separation performance.