Polybenzimidazole (PBI)-based polymeric membranes are promising candidates for H2/CO2 separation at elevated temperatures due to their exceptional thermal, chemical, and mechanical properties. Our work has been focused on understanding and manipulating the H2 permselectivity character of PBI membrane materials via molecular and macro-molecular structure variations. In this work, a series of high molecular weight PBIs with modified structures were synthesized and evaluated for gas permeation at elevated temperatures up to 250 �C. All PBI derivatives retained excellent thermal stability and exhibited improved solubility in organic solvents. Gas permeation results illustrate that incorporation of large and bulky groups into the base PBI structure in general leads to significantly enhanced H2 permeabilities with decreased H2/CO2 selectivities.

Structure-property relationships in polybenzimidazole-based membrane for high temperature H<sub>2</sub>/CO<sub>2 </sub>?separation

245th National Meeting (2013)

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Structure-property relationships in polybenzimidazole-based membrane for high temperature H2/CO2 ?separation

Structure-property relationships in polybenzimidazole-based membrane for high temperature H₂/CO₂?separation