The effect of pressure on gas permeation through semicrystalline polymers above the glass transition temperature

摘要: A method is proposed to analyze the effect of pressure on permeation gases through semicrystalline polymers above glass transition temperature. The utilizes similarities in molecular diameters and differences their solubilities. Two polymers, polyethylene polypropylene, a series are chosen for an application method, permeabilities 10 measured range 1–130 atm at 25°C. For logarithm permeability coefficient linear each gas, with negative slope slightly soluble (He, Ne, H2, N2, O2, Ar) positive highly (CH4, Kr, CO2, N2O). Analyzing these slopes by permits contributions hydrostatic concentration dependence be evaluated. On basis results, mechanism gas rubbery films under high pressures discussed.