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Sorption of gases in glassy polymers: A probabilistic model
Author(s) -
Favre Eric,
Schaetzel Pierre,
Nguyen Quang Trong,
Néel Jean
Publication year - 1994
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/mats.1994.040030208
Subject(s) - sorption , polymer , thermodynamics , dual mode , molecule , langmuir , matrix (chemical analysis) , materials science , chemistry , chemical physics , adsorption , physics , organic chemistry , chromatography , engineering , aerospace engineering
The description of the sorption mechanism of gases in glassy in glassy polymers is of importance for membrane‐based gas separation processes as well as for packaging applications. Dual mode theory, postulating a Henry and Langmuir process to occur and leading to an equation with three adjustable parameters, is usually proposed in order to describe the isotherms. A simple mechanistic model, based on an unequal affinity between the gas molecules and the matrix regions occupied either by polymer or a previously sorbed gas molecule, is presented in this paper; in contrast to dual mode theory, this approach does not postulate the existence of microvoids in the glassy matrix. Integration leads to an equation with two adjustable parameters, which is shown to describe precisely already reported isotherms.