DIELECTRIC CHARACTERIZATION OF SOME LOW PERMITTIVITY POLYMERS BY THERMALLY STIMULATED DEPOLARIZATION CURRENT METHOD

The thermally stimulated depolarization current method (TSDC) was used to study the dielectric behaviour of a low permittivity polymer, poly (ethylene terephtalate) (PET) in the range of temperature 77-300 K. Th e polymer structure, as investigated by IR spectrometry and by X-ray d iffraction, is amorphous. The global and the partial depolarisation TS DC spectrum have been obtained for samples with different types of ele ctrodes (Al, Ag, Cu). Using the shape and the dielectric relaxation pa rameters of the TSDC spectrum the dielectric behaviour and the phenome na which could appear at the interface polymer-electrode in the range of the studied temperatures have been discussed.