Modeling of transport of small molecules in polymer blends: Application of effective medium theory

J. Sax*, J. M. Ottino

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

185 Scopus citations


This article concerns itself with the prediction of effective diffusion coefficients of small permeants in binary polymer blends of varying degrees of miscibility and microstructural order. Several models have been critically evaluated with the help of previously published experimental data and in terms of consistency of morphological information provided by small permeants serving as morphological probes. Completely random, two‐phase media have been modeled in terms of Effective Medium Theory with the coordination number (z) describing the average morphology. A comprehensive analysis of experimental data has shown a correlation between z and various physical situations. Near the percolation threshold, z attains a maximum value while, above it, z tends to decrease with increasing content of the conductive component. Accurate predictions of effective diffusivity can be made for volume fractions between 0.3 and 0.8 by letting z = 6. Evidence for phase inversion was studied in terms of models with ordered microstructure and transport data.

Original languageEnglish (US)
Pages (from-to)165-176
Number of pages12
JournalPolymer Engineering & Science
Issue number3
StatePublished - Feb 1983

ASJC Scopus subject areas

  • General Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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