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Concentration‐induced stress effects in diffusion of vapors through polymer membranes
Author(s) -
Kim Myungsoo,
Neogi P.
Publication year - 1984
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1984.070290302
Subject(s) - polymer , membrane , solubility , diffusion , amorphous solid , permeation , materials science , anomalous diffusion , penetrant (biochemical) , swelling , sorption , elasticity (physics) , thermodynamics , formalism (music) , chemical physics , polymer chemistry , chemistry , composite material , organic chemistry , physics , innovation diffusion , biochemistry , knowledge management , adsorption , computer science , art , musical , visual arts
There are two types of anomalous diffusion of vapors in solid polymers which are held to be due to swelling. If the latter is seen as strain, then there must be an accompanying stress which can affect the nature and magnitude of diffusion. The theories of diffusion in polymers are examined in light of the network theory of Larché and Cahn. Their formalism is used to solve permeation and sorption in polymer membranes to illustrate the general features of the elastic effects, particularly the time‐dependent nature of the solubility. That “anomalous” effects will be present is without doubt, considering the concurrent nature of the added elastic effects. However, the present calculations fail to unearth any behavior similar to the case II diffusion. An order of magnitude estimate has been provided which shows that the effects of elasticity are usually significant in rubbery or amorphous glassy polymers where the anomalous effects occur.