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Gas permeability coefficients of ethylene‐vinyl acetate copolymer‐modified poly(dimethylsiloxane) membranes. Double‐column approach for two‐phase materials
Author(s) -
Senuma Akitaka
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(20000301)201:5<568::aid-macp568>3.0.co;2-j
Subject(s) - copolymer , membrane , volume fraction , polymer chemistry , permeability (electromagnetism) , materials science , mole fraction , chemistry , polymer , composite material , biochemistry
The Maxwell and the Landauer equations were modified on the basis of the double‐layer approach, and that of the double column approach, for the description of the permeability of a gas through two‐phase membranes. The first approach was not found to be useful for the permeability description. With the double‐column approach, the following modified Maxwell and Landauer equations were obtained: the modified Maxwell equation ( P – P a )/( P + 2 P a ) = V b ( P b – P a )/( P b + 2 P a ), and the modified Landauer equation ( P + 2 P b )( P – P a )/(3 P ) = V b ( P b – P a ), where P , P a and P b are the permeability coefficient of the overall system, and of component A and B, respectively, and V b is the volume fraction of component B. The modified equations describe the variation of the measured oxygen and nitrogen permeabilities with the polydimethyl siloxane (PDMS) fraction in ethylene‐vinyl acetate copolymer (EVAC)‐modified PDMS membranes much better than the original equations. These equations also apply to water vapor with the polyether sulfone (PES) fraction in the PES‐phenoxy blends by Swinyard.