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A free‐volume interpretation of the influence of the glass transition on diffusion in amorphous polymers
Author(s) -
Vrentas J. S.,
Duda J. L.
Publication year - 1978
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1978.070220823
Subject(s) - glass transition , penetrant (biochemical) , amorphous solid , thermodynamics , polymer , diffusion , materials science , thermal diffusivity , activation energy , solvent , diffusion process , chemical physics , polymer chemistry , chemistry , organic chemistry , physics , composite material , knowledge management , innovation diffusion , computer science
A new version of the free‐volume theory of diffusion is used to describe polymer–solvent diffusion both above and below the glass transition temperature. Expressions are derived for the temperature dependence of the mutual diffusion coefficient and for the effective activation energy in the limit of zero penetrant concentration. The theory also describes the effect of the glass transition on the diffusion process. Predictions of the theory are compared with available diffusivity data for amorphous polymer–solvent systems.