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Gas transport in rubbery polymers
Author(s) -
Sada E.,
Kumazawa H.,
Xu P.,
Nishikawa H.
Publication year - 1987
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.1987.070330835
Subject(s) - polymer , natural rubber , polyethylene , materials science , permeability (electromagnetism) , thermodynamics , butyl rubber , arrhenius equation , gaseous diffusion , activation energy , polymer chemistry , composite material , membrane , chemistry , physics , biochemistry , electrode
Permeability coefficients have been measured for CO 2 and CH 4 in polyethylene membranes at 20, 30, and 40°C and at applied gas pressures up to ca. 2 MPa and for CH 4 in three kinds of rubber films at 25, 30, and 35°C and at applied gas pressures up to ca. 2.4 MPa. The pressure dependence of the logarithms of permeability coefficients became linear except for the CO 2 —polyethylene system, where the pressure dependence became quadratic, with a minimum at a certain value of pressure. The linear and quadratic dependences can be interpreted by a free volume model of diffusion of a gas molecule in polymers. The temperature dependence of the permeability coefficients at zero pressure difference across the polymer film for each system obeyed an Arrhenius type equation.