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Case II swelling of poly(ethylene terephthalate) in organic solvents
Author(s) -
Haga Toshio
Publication year - 1981
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.1981.070260814
Subject(s) - swelling , materials science , polymer , amorphous solid , chloroform , polymer chemistry , diffusion , kinetics , penetration (warfare) , fick's laws of diffusion , composite material , chemistry , thermodynamics , organic chemistry , physics , quantum mechanics , operations research , engineering
The swelling kinetics of crystalline PET films in chloroform– n ‐hexane mixtures were examined as a function of chloroform concentration. With increasing concentration, the swelling mechanism varied from Fickian to Case II behavior. The dependence of the swelling mechanism on the equilibrium uptake and activation energy for swelling were thoroughly compatible with those presented by other workers. From a viewpoint of superposition of Fickian and Case II swelling, the intermediate swelling between the above two limiting cases was analyzed by Kwei's equation. The magnitude of the diffusion coefficient obtained was remarkably smaller than that presented for the swollen amorphous polymer. The magnitude of the penetration velocity is also discussed in comparison with the data for amorphous polymer.