The relaxation frequency as observed in thermally stimulated depolarisation current experiments in polymers

lThe equivalent frequency at the maximum current intensity of Debye peaks o btained by the thermally stimulated depolarisation current technique (TSDC) was discussed and its dependence on the Arrhenius parameters was calculate d. The effect of the heating rate was also considered. Some specific virtua l situations (zero entropy behaviour and compensation phenomena) were compa red with experimental results on 11 non-conventional polymers near and belo w the glass transition temperature. For one such polymer, the temperature d ependence on the frequency of the alpha- and beta-relaxation observed by di electric relaxation spectroscopy was compared with the results obtained by thermally stimulated discharge current in the glass transition and sub-T-g regions. (C) 1999 Elsevier Science B.V. All rights reserved.