Abstract
The effect of the degree of extension λ on the value of the coefficients of diffusion D and gas permeability k for argon and helium of low pressure polyethylene films is studied at different rates of extension. It is shown that for λ < 2–3 the value D falls irrespective of the conditions of preparing and deforming the films. A theoretical explanation is given for this effect associated with fall in the mobility of the chain links in the amorphous phase of polyethylene. At λ > 3–4 the influence of the rate of extension and the conditions of preparing the films is observed. For some films a specific dependence of D on the pressure of the gases appears, which indicates the presence of a capillary mechanism of gas transfer. A qualitative explanation of the influence on D of the rate of stretching is given. The relaxation times (∼ 1 sec) of the structural elements of the material are determined.
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