Abstract
AbstractPermeability coefficients for Ar, SF6, CF4, and C2H2F2 (1,1‐difluoroethylene) in polyethylene membranes were determined from steady‐state permeation rates at temperatures from 5 to 50°C, and at applied gas pressures of up to 15 atm. The temperature and pressure dependence of the permeability coefficients was represented satisfactorily by an extension of Fujita's free volume model of diffusion of small molecules in polymers. The parameters required by this model were determined from independent absorption (diffusivity) measurements with the above gases in polyethylene rods. The present work confirms the results of previous studies with CO2, CH4 C2H4 and C3H8 in polyethylene.
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