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Case II swelling of poly(ethylene terephthalate) in organic solvents

Case II swelling of poly(ethylene terephthalate) in organic solvents 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Polymer Science Wiley

Case II swelling of poly(ethylene terephthalate) in organic solvents

Haga, Toshio
Journal of Applied Polymer Science , Volume 26 (8) – Aug 1, 1981
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Publisher
Wiley
Copyright
Copyright © 1981 John Wiley & Sons, Inc.
ISSN
0021-8995
eISSN
1097-4628
DOI
10.1002/app.1981.070260814
Publisher site
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Abstract

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.

Journal

Journal of Applied Polymer Science – Wiley

Published: Aug 1, 1981

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