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Citation: Li Yuesheng, Ding Mengxian, Xu Jiping. STRUCTURE-PERMEABILITY RELATIONSHIPS OF 6FDA-BASED POLYIMIDE MEMBRANES[J]. Chinese Journal of Applied Chemistry, ;1993, 10(2): 81-83. shu

STRUCTURE-PERMEABILITY RELATIONSHIPS OF 6FDA-BASED POLYIMIDE MEMBRANES

1.
Changchun Institute of Applied Chemisty, Chinese Academy of Sciences, 130022 Changchun

Received Date: 11 March 1992
Available Online: 26 October 1992
Fund Project:

The permeability coefficients of five 6FDA-based polyimide membranes to H₂, CO₂, O₂,N₂, and CH₄ have been meassured at 0.6MPa and 30℃. Differences in chemical structure were found to lead to a significant change in permeability coefficients and were related to the ideal separation factotes of smaller penetrant molecules against biger ones. For polyimides 6FDA-DABP, 6FDA-ODA, 6FDA-MDA and 6FDA-IPDA, the increase in permeability coefficents was accompanied with the decrease of the ideal separation factors. Having the bulky methyl side groups on the aromatic rings of DMMDA, polyimide 6FDA-DMMDA possesses both high P_H₂ and high α_H₂/N₂ and α_H₂/CH₄. The favorable permseleetivity, excellent thermal and mechanical durability, and good processability make 6FDADMMDA a promising candidate material for gas separation.
- polyimide,
- gas separation,
- membrane,
- gas permeability
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