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Macromolecules

Macromolecules

IF: 5.09
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Synthesis of Polyimides Containing Benzimidazole Groups in Side Chains for Natural Gas Separation

Published:5 December 2024 DOI: 10.1021/acs.macromol.4c02421
Xiaohua Tong, Guangran Shao, Ming Yuan, Xuewei Li, Wangqing Zhang

Abstract

Polyimides for natural gas separation are synthesized from copolycondensation of 5-(1H-benzimidazol-2-yl)benzene-1,3-diamine (BIB) with 2,3,5,6-tetramethyl-1,4-phenylenediamine (Durene) and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) with different 6FDA/BIB/Durene ratios. All polyimides containing benzimidazole groups in side chains display good processability, outstanding thermal stability, and excellent mechanical properties. The CO2 permeability and CO2/CH4 selectivity of the synthesized polyimides change with the 6FDA/BIB/Durene ratio or the BIB content. At a total pressure of 2 bar and a CO2/CH4 feed ratio of 50:50, the polyimide synthesized with 30% BIB content (F10B3D7) exhibits a high CO2 permeability of 197.2 Barrer coupled with a high CO2/CH4 selectivity of 38.6, which is close to the 2008 Robeson’s upper bound. Besides, CO2-induced plasticization and physical aging of polyimide membranes can also be regulated by tuning the 6FDA/BIB/Durene ratio. Specifically, F10B3D7 also exhibits good plasticization resistance and excellent stability against physical aging, and it is demonstrated to be a promising candidate for the purification of biogas and the removal of CO2 molecules from natural gas.

Substances (5)

Materials
Procduct Name CAS Molecular Formula Supplier Price
N,N-Dimethylformamide 68-12-2 C3H7NO 1313 suppliers $11.20-$12200.00
Tetrahydrofuran 109-99-9 C4H8O 1168 suppliers $9.00-$17160.00
Pyridine 110-86-1 C5H5N 976 suppliers $9.00-$25600.00
3,5-Dinitrobenzoic acid 99-34-3 C7H4N2O6 670 suppliers $10.00-$4112.36
o-Phenylenediamine 95-54-5 C6H8N2 611 suppliers $9.00-$1283.02

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