Supramolecular Polymer Networks of Ion-Coordinated Polybenzimidazole with Simultaneously Improved H2 Permeability and H2/CO2 Selectivity
Cross-linking polymers using covalent bonds often improves polymer chain packing
efficiency and thus molecular size-sieving ability but decreases gas permeability. Herein, we
demonstrate that supramolecular polymer networks (SPNs) comprising polybenzimidazole
(PBI) and dissociable metal salts (including palladium trifluoroacetate and nickel
trifluoroacetate) display unusual behavior of breaking the permeability/selectivity tradeoff for
H2/CO2 separation. With metal ions coordinating the imidazole rings on PBI chains and …
efficiency and thus molecular size-sieving ability but decreases gas permeability. Herein, we
demonstrate that supramolecular polymer networks (SPNs) comprising polybenzimidazole
(PBI) and dissociable metal salts (including palladium trifluoroacetate and nickel
trifluoroacetate) display unusual behavior of breaking the permeability/selectivity tradeoff for
H2/CO2 separation. With metal ions coordinating the imidazole rings on PBI chains and …
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