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Concentration dependence of diffusivities of penetrants in glassy polymer membranes
Author(s) -
Sada E.,
Kumazawa H.,
Wang J.S.
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070480601
Subject(s) - methyl methacrylate , polymer , membrane , polymer chemistry , methyl acrylate , copolymer , permeation , materials science , methacrylate , permeability (electromagnetism) , butyl acrylate , thermodynamics , acrylate , chemistry , composite material , biochemistry , physics
Abstract Steady‐state permeation rates for pure CO 2 , CH 4 , and O 2 through two kinds of homogeneous dense membranes, copolymer of methyl methacrylate and n ‐butyl acrylate and poly(methyl methacrylate), were measured at three temperatures between 20 and 40°C and upstream pressures up to 3 MPa. The logarithms of the mean permeability coefficients for CO 2 in both membranes increased linearly or quadratically with increasing upstream pressure, whereas the mean permeabilities for CH 4 and CO 2 were independent of pressure. The pressure dependence of the mean permeability coefficient for CO 2 was interpreted in terms of a modified free‐volume model of diffusion for a Henry's law population in glassy polymers. © 1993 John Wiley & Sons, Inc.