Sorption and diffusion of low molecular weight gases and vapors in glassy polymers at high concentration of sorbate

A theoretical approach has been developed to describe the sorption and diffusion processes of low weight molecular gases and vapors in polymers at wide ranges of sorbate concentration. The equation of an S‐shaped gas sorption isotherm in glassy polymer matrix has been derived. The concentration depe...

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Bibliographic Details
Published in:	Journal of polymer science. Part B, Polymer physics Vol. 37; no. 17; pp. 2314 - 2323
Main Authors:	Krykin, M. A., Zinovieva, O. M., Zinoviev, A. B.
Format:	Journal Article
Language:	English
Published:	New York John Wiley & Sons, Inc 01-09-1999 Wiley
Subjects:	diffusion processes gas sorption glassy polymers high concentration
Online Access:	Get full text
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Summary:	A theoretical approach has been developed to describe the sorption and diffusion processes of low weight molecular gases and vapors in polymers at wide ranges of sorbate concentration. The equation of an S‐shaped gas sorption isotherm in glassy polymer matrix has been derived. The concentration dependence of the sorbate molecule diffusion coefficient has been established. For an S‐shaped sorption isotherm, this dependence is nonmonotonous. The conditions of cluster formation of sorbate molecules have been analyzed within the proposed approach, in which it is possible to determine a correlation between these conditions and parameters of sorption isotherm. The comparison of the experimental and theoretical data provides an assessment of the microscopic characteristics of investigated polymer–vapor systems, such as the distances between vapor molecules in a matrix corresponding to intermolecular repulsion and attraction. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 2314–2323, 1999
Bibliography:	ArticleID:POLB3 ark:/67375/WNG-3BD4HCZQ-M istex:59564D68AA8767518765BB4602ED44AC66EF7DD6
ISSN:	0887-6266 1099-0488
DOI:	10.1002/(SICI)1099-0488(19990901)37:17<2314::AID-POLB3>3.0.CO;2-H