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Supramolecular assemblies of polybenzimidazole and aromatic polycarboxylic acids with superior mechanical and H2/CO2 separation properties

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/d1ta10968e· OSTI ID:1864406

Aromatic polycarboxylic acids complex with imidazoles, forming supramolecular assemblies. Herein, we demonstrate that polybenzimidazole (PBI) can be augmented by aromatic polycarboxylic acids, including phthalic acid (PA), trimesic acid (TMA), and pyromellitic acid (PMA), and the resulting supramolecular assemblies exhibit attractive H2/CO2 separation performance for precombustion carbon capture. The acid doping decreases the free volume and gas permeability but increases H2/CO2 selectivity, which can be correlated with the molar ratio of the protons to PBI repeating units in the assemblies. Increasing the temperature decreases the H2/CO2 selectivity because of weakened interactions. When challenged with model gas mixtures, a supramolecular assembly based on TMA shows H2/CO2 separation properties superior to state-of-the-art materials and above Robeson's upper bound. Furthermore, this study elucidates the fruitful harnessing of dynamic non-covalent bonds to design robust and highly selective membranes for industrial gas separations.

Research Organization:
Univ. at Buffalo, State Univ. of New York (SUNY), Buffalo, NY (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); National Science Foundation (NSF)
Grant/Contract Number:
FE0031636
OSTI ID:
1864406
Alternate ID(s):
OSTI ID: 1864064
OSTI ID: 1865817
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 20 Vol. 10; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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