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Theoretical and experimental investigations of molecular migration and diffusion kinetics of organic esters into tetrafluoroethylene/propylene copolymer membranes
Author(s) -
Aminabhavi Tejraj M.,
Harlapur Sujata F.,
Balundgi Ramachandra H.,
Dale Ortego J.
Publication year - 1998
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450760113
Subject(s) - tetrafluoroethylene , membrane , copolymer , kinetics , diffusion , solvent , polymer chemistry , chemistry , hexafluoropropylene , penetration (warfare) , ethyl acetate , thermodynamics , chemical engineering , materials science , organic chemistry , polymer , biochemistry , physics , quantum mechanics , operations research , engineering
A theoretical analysis of the experimental results on the migration and diffusion kinetics of methyl acetate, ethyl acetate, n ‐propyl acetate, n ‐butyl acetate and iso ‐amylacetate into tetrafluoroethylene/propylene copolymer membranes has been made. Diffusion and permeability coefficients have been calculated from Fick's equation. The concentration profiles of the liquids have been calculated from a solution of Fick's equation as well as using an empirical relation for the esters into the varying penetration depths of the membranes at different time intervals. The diffusion coefficients show a systematic decrease with increasing size of esters and the results are discussed in terms of the membrane‐solvent interactions.