Highly Selective Benzimidazole-Based Polyimide/Ionic Polyimide Membranes for Pure- and Mixed-Gas CO2/CH4 Separation

• Published in: Separation and purification technology Vol. 282; p. 120091
• Main Authors: Xie, Wei, Jiao, Yang, Cai, Zhili, Liu, Hongyan, Gong, Lili, Lai, Wei, Shan, Linglong, Luo, Shuangjiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2022
• Subjects: Hydrogen bonding; Ionic polyimides; Mixed-gas permeation; Nature gas sweetening; Polyimides; Nature gas sweetening; Ionic polyimides; Mixed-gas permeation; Hydrogen bonding; Polyimides

•Hydrogen bonding and electrostatic interaction tighten microporous structure and restrict polymer chain mobility.•BET surface areas and d-spacing values decrease with benzimidazole molar content and the degree of ionization.•Hydrogen bonding and electrostatic interaction cause gain of CO2/CH4 selec...