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Evaluation of diffusion in a polymeric system by measurement of the displacement of the solubility front

✍ Scribed by Bernard Leclerc; Guillaume Conrath; Françoise Falson-Reig; Guy Couarraze

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
465 KB
Volume
25
Category
Article
ISSN
0014-3057

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✦ Synopsis

AMtract--The study of diffusion in a polymeric system often poses difficult experimental problems, notably when a rate of release is determined in a liquid receptor phase which can interact with the system. In this publication, we propose an accurate method to determine the diffusion coef~cient by measurement of the displacement of the solubility front during the diffusion within the system alone. The theoretical model, developed in the first part, shows that the rate of this displacement is a function of ,,~. According to the knowledge of the solubility of the diffusing molecule in the system, two types of interpretation of these kinetics are presented. For illustration, two experimental studies are given in the second part.

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