Oxygen and ethylene permeabilities have been determined at 19°C for three kinds of polyethylene films (LDPE, LLDPE and HDPE) and in the temperature range 4–30°C for LDPE. At constant temperature, ethylene and oxygen permeabilities decrease with increasing density. The temperature dependence of oxygen and ethylene permeabilities was found to be Arrhenius in the temperature range tested, with activation energies of 47.7 and 44.1 kJ/mol for ethylene and oxygen respectively. Permeabilities were found to be independent of film thickness and oxygen and ethylene permeabilities were independent of the composition of oxygen/nitrogen mixtures. Gas permeabilities for zeolite-filled LDPE films were found to be larger than oxygen and ethylene permeabilities for unfilled LDPE film. The adsorption isotherm of ethylene on the ceramic component of the films has been measured at room temperature: the absorption isotherm corresponds to monolayer adsorption and the adsorption capacity of the ceramic was measured as 3.06 mmol/g.
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Wang et al. (1998) studied this question.
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