Sorption of a finite amount of swelling solvent in a glassy polymer

We study the time history of a diffusing front when a polymer is exposed to a finite amount of penetrant which becomes used up. A class of polymers is considered for which slow molecular relaxation occurs only at or near the glass‐gel interface with instantaneous relaxation both ahead of and behind...

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Veröffentlicht in:Journal of polymer science. Part B, Polymer physics Polymer physics, 1987-03, Vol.25 (3), p.611-617
Hauptverfasser: Cohen, Donald S., Goodhart, Charles
Format: Artikel
Sprache:eng
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Zusammenfassung:We study the time history of a diffusing front when a polymer is exposed to a finite amount of penetrant which becomes used up. A class of polymers is considered for which slow molecular relaxation occurs only at or near the glass‐gel interface with instantaneous relaxation both ahead of and behind the progressing front. We show that the position of the penetrant front versus time undergoes a long smooth transition from standard Fickian t1/2 behavior to exponential time decay onto a final equilibrium position attained when all the penetrant is used up.
ISSN:0887-6266
1099-0488
DOI:10.1002/polb.1987.090250312