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Abstract
Abstract A study was made of the temperature dependence of the rate of nitrogen and helium desorption from gas-filled polystyrene films in the range 100–410°K. Considerable differences in the desorption regularities for nitrogen and helium were observed. In the range 190–380°K the diffusion of nitrogen is described by the Arrhenius law with the parameters D 0 =21 × 10 −5 cm 2 /sec and E =5·3 kcal/mole. At temperatures above 380°K there is a marked change in the diffusion parameters owing to the process of glass transition. The regularities of helium desorption are only slightly dependent on film thickness in the range 45–320 μm. This is explained by permeation of the gas through defects with dimensions comparable to those of helium atoms.
Published Version
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