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Estimating polymer/solvent diffusion coefficient by optimization procedure
Author(s) -
Doumenc Frédéric,
Guerrier Béatrice
Publication year - 2001
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690470505
Subject(s) - gravimetric analysis , solvent , diffusion , polymer , thermodynamics , a priori and a posteriori , chemistry , sensitivity (control systems) , materials science , biological system , physics , organic chemistry , engineering , epistemology , electronic engineering , biology , philosophy
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.