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

Chun Zhou, Tai Shung Chung*, Rong Wang, Suat Hong Goh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1758-1764
Number of pages7
JournalJournal of Applied Polymer Science
Issue number3
StatePublished - May 5 2004
Externally publishedYes


  • Accelerated physical aging
  • Fluoropolyimide
  • Glassy polymer
  • Thin film

ASJC Scopus subject areas

  • General Chemistry
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry


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