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Estimating polymer/solvent diffusion coefficient by optimization procedure

✍ Scribed by Frédéric Doumenc; Béatrice Guerrier

Publisher
American Institute of Chemical Engineers
Year
2001
Tongue
English
Weight
189 KB
Volume
47
Category
Article
ISSN
0001-1541

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✦ Synopsis

Abstract

Solvent diffusion in polymer solutions is one of the main parameters that determine the drying kinetics of polymer films, especially in the concentrated domain. As is well known for polymer/solvent solutions, solvent diffusion coefficients decrease by several orders of magnitude when the solvent concentration decreases. Direct measurements of these coefficients are complex and time‐consuming, and most often dedicated to well‐characterized “model” systems. In this study, another approach is developed that is based on simple gravimetric experiments coupled with the modelization of the drying kinetics and an optimization iterative procedure. The sensitivity of the method to various errors (measurement errors and uncertainties on a priori known parameters) is thoroughly investigated. The method accurately estimates diffusion coefficients on a large concentration domain, provided a suitable experimental strategy is used.

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