Polybenzimidazole based random copolymers containing hexafluoroisopropylidene functional groups for gas separations at elevated temperatures

Singh, Rajinder Pal; Li, Xin; Dudeck, Kevin Wade; Benicewicz, Brian C.; Berchtold, Kathryn A.

doi:10.1016/j.polymer.2017.04.075

Polybenzimidazole based random copolymers containing hexafluoroisopropylidene functional groups for gas separations at elevated temperatures

Journal Article · Fri Apr 28 00:00:00 EDT 2017 · Polymer

DOI:https://doi.org/10.1016/j.polymer.2017.04.075· OSTI ID:1467203

^[1]; Li, Xin ^[2]; Dudeck, Kevin Wade ^[1]; Benicewicz, Brian C. ^[2]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of South Carolina, Columbia, SC (United States)

Polybenzimidazoles (PBIs) are attractive membrane materials for H₂/CO₂ separation at hydrocarbon fuel derived synthesis gas operating conditions due to their exceptional physicochemical stability and promising permselectivity character. PBI molecular structure modification is a viable approach to disrupt chain packing altering the free-volume architecture which results in improved gas transport characteristics. This work is focused on the synthesis and characterization of novel PBI random copolymers for application as elevated temperature H₂/CO₂ membranes. The co-polymerization route is expected to result in tailorable permeability and selectivity by combining the high H₂ permeability aspect of the highly disrupted loosely packed hexafluoroisopropylidene diphenyl group containing PBI segments (6F-PBI) with the highly selective tightly packed phenylene group containing PBI segments (m-PBI). 6F/m-PBI copolymers with varying 6F-PBI and m-PBI ratios having high inherent viscosity were synthesized. The structure and ratio of the 6F- and m-PBI fractions were confirmed using FTIR and NMR spectroscopic techniques. The measured gas transport properties of copolymer thin films cast in controlled environment were measured as a function of the operating conditions. Lastly, the H₂ permeability increased while H₂/CO₂ selectivity decreased as the 6F-PBI copolymer fraction was increased.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1467203

Alternate ID(s):: OSTI ID: 1396514

Report Number(s):: LA-UR--17-23507

Journal Information:: Polymer, Journal Name: Polymer Journal Issue: C Vol. 119; ISSN 0032-3861

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Carbon capture
Energy Sciences
Hydrogen selective membrane
Material Science
Polybenzimidazole
Pre-combustion
Random copolymer
Synthesis gas

Polybenzimidazole based random copolymers containing hexafluoroisopropylidene functional groups for gas separations at elevated temperatures

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