Modeling weakly non-linear two-stage sorption kinetics in glassy polymer films

S. J. Huang, C. J. Durning, B. D. Freeman

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7 Citations (Scopus)


A model for non-Fickian gradient diffusion in polymer-penetrant systems is studied to assess its capability in predicting experimental results in weakly non-linear differential vapor sorption experiments at conditions where 'two-stage' sorption kinetics occur. The effects of six dimensionless parameters in the model on predictions of sorption kinetics are evaluated systematically by numerical simulations. The model predicts a number of observable trends. The predictions are compared successfully with sorption data of acetone vapor in VECTRA®, a glassy random copolyester of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid (HBA/HNA). The results are relevant to the application of VECTRA® and related polymers as barrier materials.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalJournal of Membrane Science
Issue number1-2
Publication statusPublished - 27 May 1998
Externally publishedYes


  • Barrier membranes
  • Diffusion
  • Non-Fickian diffusion
  • Theory
  • Two-stage sorption

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