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Gas transport in polymer membrane at temperatures above and below glass transition point
Author(s) -
Kumazawa H.,
Wang J.S.,
Naito K.,
Messaoudi B.,
Sada E.
Publication year - 1994
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.1994.070510606
Subject(s) - glass transition , sorption , polymer , permeation , plasticizer , permeability (electromagnetism) , materials science , thermodynamics , membrane , polymer chemistry , analytical chemistry (journal) , chemistry , chromatography , composite material , adsorption , biochemistry , physics
The processes of gas sorption and permeation in a polymer membrane at temperatures above and below the glass‐transition point were examined using poly‐4‐methylpentene‐1 (glass‐transition temperature reported to be 40°C) as a membrane material. The permeabilities to O 2 and N 2 were independent of applied gas pressure at every temperature; the mean permeability coefficient to CO 2 increased with increasing gas pressure. The logarithm of the mean permeability coefficient to CO 2 increased linearly with gas pressure due to the plasticization effect induced by sorbed CO 2 . From the sorption isotherms for CO 2 at 20 and 30°C it was judged that the glass transition was brought about by sorbed CO 2 at temperatures below the glass‐transition point of the pure polymer. © 1994 John Wiley & Sons, Inc.