Effect of thermal annealing on the gas permeability of HIQ-40 films

J. Y. Park, D. R. Paul, I. Haider, M. Jaffe

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16 Scopus citations


The copolyester formed from 40 mol% p-hydroxybenzoic acid (H), 30 mol% isophthalic acid (I), and 30 mol% hydroquinone (Q), designated as HIQ-40, forms isotropic, amorphous films when appropriately cast from a solvent. Thermal annealing leads to a mesogenic texture and some level of crystallinity. It is shown that these ordering processes lead to dramatic reductions in gas permeability; the magnitude of the decrease increases with the size of the penetrant. The current results are consistent with previously reported sorption data for acetone in HIQ-40.

Original languageEnglish (US)
Pages (from-to)1741-1745
Number of pages5
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number10
StatePublished - Jul 30 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry


  • Annealing
  • Crystallinity
  • Gases
  • Liquid crystalline polymer
  • Permeability


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