Effect of gamma irradiation on the dielectric relaxation of uniaxially oriented low density polyethylene
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The dielectric loss tangent of unirradiated acid irradiated low density polyethylene (LDPE) samples was measured as a function of temperature, from 50K to room temperature, in directions normal and parallel to that of drawing. The influence of drawing and irradiation on the beta-relaxation and gamma-relaxation are related to the changes in the structure of the amorphous phase and lamellae distribution, and to the radiation-induced processes of degradation and crosslinking. (C) 1999 Society of Chemical Industry.