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A method of moments for measuring diffusivities of gases in polymers
Author(s) -
Felder R. M.,
Ma CC,
Ferrell J. K.
Publication year - 1976
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.690220414
Subject(s) - thermal diffusivity , polymer , natural rubber , sulfur dioxide , permeation , range (aeronautics) , thermodynamics , butyl rubber , chemistry , atmospheric temperature range , materials science , analytical chemistry (journal) , chromatography , composite material , membrane , organic chemistry , physics , biochemistry
A method of moments has been formulated for the determination of the diffusivity of a gas in a polymer from a step response in a continuous permeation chamber. Contributions of system components other than the polymer are easily factored out to determine the contribution of the polymer alone, and this contribution is then analyzed to calculate the diffusivity. The method has been applied to the measurement of the diffusivities of sulfur dioxide in PTFE (Teflon) and fluorosilicone rubber tubes over a wide temperature range.