UNIVERSAL SCALING BEHAVIOR OF DIELECTRIC-DISPERSION AND ITS BREAKDOWN IN GLYCEROL, PROPYLENEGLYCOL AND TRIMETHYLENEGLYCOL

Dielectric dispersions for glycerol, propyleneglycol and trimethyleneglycol have been measured in the frequency range from 0.1 kHz to 1 GHz. It is found that for glycerol and propyleneglycol, the epsilon''(v) curve changes the shape gradually with increasing temperature above T-a, whereas for trimethyleneglycol it once disappears around 197 K and appears again above 233 K with gradual change of the shape, where T-a is the temperature below which epsilon(p)'' falls on a straight line at all temperatures below T-a. It is also examined that a non-ergodic and ergodic transition occurred or not by analyzing the temperature dependence of v(p)(1/1.8).