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Title: A theory of case II diffusion
Authors: Thomas, Noreen L.
Windle, A.H.
Keywords: Diffusion
Case II
Issue Date: 1982
Publisher: © Elsevier
Citation: THOMAS, N.L. and WINDLE, A.H., 1982. A theory of case II diffusion. Polymer, 23 (4), pp.529-542.
Abstract: 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.
Description: This article is closed access.
Version: Closed access
DOI: 10.1016/0032-3861(82)90093-3
URI: https://dspace.lboro.ac.uk/2134/11412
Publisher Link: http://dx.doi.org/10.1016/0032-3861(82)90093-3
ISSN: 0032-3861
Appears in Collections:Closed Access (Materials)

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