Engineering the Polymer–MOF Interface in Microporous Composites to Address Complex Mixture Separations

• DOI: 10.1021/acsami.3c11300
• Publication Date: 2023-11-06T20:30:11Z
• Authors: Wan-Ni Wu; Katherine Mizrahi...; Naksha Roy; Justin J. Teesdale; Gang Han; Alexander Liu; Zachary P. Smith
• Keywords: Plasticizer

Poor interfacial compatibility remains a pressing challenge in the fabrication of high-performance polymer-MOF composites. In response, introducing compatible chemistries such as carboxylic acid moiety has emerged compelling strategy to increase interactions. this work, we leveraged functionalities UiO-66-NH2 and acid-functionalized PIM-1 fabricate mixed-matrix membranes (MMMs) with improved separation performance compared PIM-1-based MMMs industrially relevant conditions. Under pure-gas conditions, PIM-COOH-based retained selectivity increasing MOF loading showed increased permeability due diffusion. The composites were further investigated under including CO2/N2, CO2/CH4, H2S/CO2/CH4 mixtures, elucidate effects competitive sorption plasticization. Incorporation PIM-COOH mitigated CO2- H2S-induced plasticization typically observed linear polymers. CO2-based binary mixed-gas tests, all samples similar that minimal contributions associated amine functional groups MOF. ternary resistance resulted having highest H2S/CH4 CO2/CH4 combinations among films tested study. These findings demonstrate selecting MOFs polymers is useful developing high-performing microporous require stability complex