Chemical cross-linking modification of polyimide membranes for gas separation |
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| Affiliation: | 1. Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore;2. Environmental Technology Institute, Innovation Centre (NTU), Block 2, Unit 237, 18 Nanyang Drive, Singapore 637723, Singapore;3. Department of Chemical and Environmental Engineering, National University of Singapore, Singapore 119260, Singapore;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore;2. Suzhou Faith & Hope Membrane Technology Ltd Co., SIP, Jiangsu, PR China;1. Organic Material Synthesis Laboratory, Department of Chemistry, Incheon National University, 119 Academy-ro, Songdo-dong, Yeonsu-gu, Incheon 406-772, Republic of Korea;2. WCU Department of Energy Engineering, Hanyang University, Seoul 133-791, Republic of Korea;3. Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University, Jinju 660-701, Republic of Korea |
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| Abstract: | We have developed an extremely simple room temperature chemical cross-linking technology for the modification of polyimide films for gas separations of He/N2 and O2/N2. Using 6FDA-durene as an example, chemical modification is performed by immersing the dense 6FDA-durene films in a p-xylenediamine methanol solution for a certain period of time followed by washing with fresh methanol and drying at ambient temperature. The chemical structure changes during the cross-linking process were monitored by FTIR, which indicated that imide groups were turned to amide groups during the modification process. TGA analyses showed cross-linked polyimides were thermally stable for gas separation applications. Gas permeation properties of modified polyimides to He, O2, N2 and CO2 were measured at 35°C and 10 atm. It is found that the gas permeability decreased significantly in the order of CO2>N2>O2>He with an increase in the degree of cross-linking, which were mainly attributed to the significant decreases in diffusion coefficients. The permselectivities of He/N2 and O2/N2 increased from 10 to 86 and from 4.1 to 5.9, respectively, but CO2/N2 decreased from 12 to 5.4, which suggest this cross-linking approach is most useful for the application of He/N2 and O2/N2 separations. |
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