Finely tuning the microporosity in dual thermally crosslinked polyimide membranes for plasticization resistance gas separations

• Published in: Journal of membrane science Vol. 659; p. 120769
• Main Authors: Wang, Can, Cai, Zhili, Xie, Wei, Jiao, Yang, Liu, Lu, Gong, Lili, Zhang, Qi-Wei, Ma, Xiaohua, Zhang, Hongjun, Luo, Shuangjiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.10.2022
• Subjects: Gas separation membrane; Natural gas sweetening; Plasticization resistance; Polyimides; Thermal crosslinking; Natural gas sweetening; Plasticization resistance; Thermal crosslinking; Gas separation membrane; Polyimides
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2022.120769

Thermally induced chemical crosslinking has attracted substantial attention for fabricating plasticization resistant membranes due to the facile structure tunability that enables the construction of robust and well-defined architecture for gas separation. In this study, we report a new series of dual thermally crosslinkable polyimides derived from 4,4′-diamino-2,2′-biphenyldicarboxylic acid (DCB) containing two carboxyl groups, and a systematic investigation of the thermal treatment above and below Tg demonstrated the decarboxylation-induced crosslinking. The dual thermally crosslinked membranes were insoluble in common organic solvents and maintained excellent mechanical properties. Due to the evolution of CO2 and collapse of chain segments during thermal treatment, the crosslinked membranes exhibited hierarchical microcavity size distribution featuring ultra-micropore size in the range of 2.0–6.0 Å and micropore size in the range of 6.5–10.0 Å. Gas transport properties of the crosslinked membranes were feasibly tuned through the chemical compositions and thermal treatment procedures. For instance, the CO2 permeability of crosslinked 6FDA-DAM0.7-TFMB0.1-DCB0.2 increased almost three-fold with only a slight decrease in CO2/CH4 selectivity. The crosslinked membranes also demonstrated superior plasticization resistance with mixed-gas feed pressure up to 40 bar and excellent low-temperature gas separation performance at −30 °C, making them attractive for aggressive gas separations. [Display omitted] •Dual thermal crosslinking provides additional tunability toward membrane microporosity and gas separation performance.•Positron annihilation lifetime spectroscopy demonstrates hierarchical microcavity architecture of the crosslinked membranes.•Dual thermal crosslinking improves crosslinking efficiency and boosts the CO2 permeability increment up to 444%.•Crosslinked membranes show superior anti-plasticization properties and excellent low-temperature gas separation performance.