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A theory of case II diffusion

journal contribution
posted on 10.01.2013 by Noreen Thomas, A.H. Windle
A theory is proposed to explain the transport behaviour of organic penetrants in glassy polymers in terms of two basic parameters: the diffusivity of the penetrant, D, and the viscous flow rate of the glassy polymer, 1/170. The rate controlling process for transport in these systems is considered to be diffusion of solvent down an activity gradient coupled with time-dependent mechanical deformation of the polymer glass in response to the swelling stress. The theory combines these two factors and is able to predict a wide range of observed transport phenomena from Fickian diffusion kinetics at one extreme to so-called Case II and Super-Case II behaviour at the other. The existence of a sharp front separating swollen and unpenetrated polymer is shown to result from the concentration dependence of the viscous flow rate.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Citation

THOMAS, N.L. and WINDLE, A.H., 1982. A theory of case II diffusion. Polymer, 23 (4), pp.529-542.

Publisher

© Elsevier

Version

NA (Not Applicable or Unknown)

Publication date

1982

Notes

This article is closed access.

ISSN

0032-3861

Language

en

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