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A governing equation for physical aging of thick and thin fluoropolyimide films

Authors

  • Chun Zhou,

    1. Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
    2. Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602
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  • Tai-Shung Chung,

    Corresponding author
    1. Department of Chemical & Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
    • Department of Chemical & Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
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  • Rong Wang,

    1. Institute of Environmental Science & Engineering, 18 Nanyang Drive, Singapore 637723
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  • Suat Hong Goh

    1. Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
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Abstract

An equation based on the segmental/chain mobility in free volume theory was derived to correlate the gas permeation coefficient and the aging time. An accelerated physical aging of a fluoropolyimide was observed and employed to validate this equation. A strong thickness-dependent aging process was found by employing pure O2 and N2 tests to monitor the change of gas permeation properties as a function of aging time. Experimental results also suggest that chain rigidity and configuration play important roles in physical aging. As a result, the thin 2,2′-bis(3,4′-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) based polyimide films studied here have different permeability versus time relationship from conventional polyarylate in the early stage of aging, and the experimental data seem to fit the proposed equation well. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1758–1764, 2004

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