✦ LIBER ✦

Gas transport in rubbery polymers

✍ Scribed by E. Sada; H. Kumazawa; P. Xu; H. Nishikawa

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 325 KB
Volume: 33
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1987.070330835

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✦ Synopsis

Permeability coefficients have been measured for CO, and CH, in polyethylene membranes at 20, 30, and 40°C and at applied gas pressures up to ca. 2 MPa and for CH, in three kinds of rubber films at 25, 30, and 35OC and at applied gas pressures up to ca. 2.4 MPa. The pressure dependence of the logarithms of permeability coe5cients became linear except for the C0,-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 a t zero pressure difference across the polymer f i l m for each system obeyed an Arrhenius type equation.

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