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Title: Gas-transport properties of indan-containing polyimides
Authors: Liu, S.L.
Chng, M.L. 
Chung, T.S. 
Goto, K.
Tamai, S.
Pramoda, K.P.
Tong, Y.J.
Keywords: Gas permeation
Indan structure
Issue Date: 15-Jul-2004
Citation: Liu, S.L., Chng, M.L., Chung, T.S., Goto, K., Tamai, S., Pramoda, K.P., Tong, Y.J. (2004-07-15). Gas-transport properties of indan-containing polyimides. Journal of Polymer Science, Part B: Polymer Physics 42 (14) : 2769-2779. ScholarBank@NUS Repository.
Abstract: A series of Indian-containing polyimides were synthesized, and their gaspermeation behavior was characterized. The four polyimides used in this study were synthesized from an indan-containing diamine [5,7-diamino-1,1,4,6- tetramethylindan (DAI)] with four dianhydrides [3,3′4,4′- benzophenone tetracarboxylic dianhydride (BTDA), 3,3′4,4′- oxydiphthalic dianhydride (ODPA), (3,3′4,4′-biphenyl tetracarboxylic dianhydride (BPDA), and 2,27prime;-bis(3,4′-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA)]. The gas-permeability coefficients of these four polyimides changed in the following order: DAI-BTDA < DAI-ODPA < DAI-BPDA < DAI-6FDA. This was consistent with the increasing order of the fraction of free volume (FFV). Moreover, the gas-permeability coefficients were almost doubled from DAI-ODPA to DAI-BPDA and from DAI-BPDA to DAI-6FDA, although the FFV differences between the two polyimides were very small. The gas permeability and diffusivity of these indan-containing polyimides increased with temperature, whereas the permselectivity and diffusion selectivity decreased. The activation energies for the permeation and diffusion of O 2, N 2, CH 4, and CO 2 were estimated. In comparison with the gas-permeation behavior of other indan-containing polymers, for these polyimides, very good gas-Permeation performance was found, that is, high gas-permeability coefficients and reasonably high permselectivity. © 2004 Wiley Periodicals, Inc.
Source Title: Journal of Polymer Science, Part B: Polymer Physics
ISSN: 08876266
DOI: 10.1002/polb.20155
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