Peculiar Behavior of the Secondary Dielectric Relaxation in Propylene Glycol Oligomers near the Glass Transition

摘要

We present results of broadband dielectric measurements of dipolypropylene glycol at ambient pressure in the wide temperature range from 123 to 263 K. The well resolved secondary -relaxation exhibits the anomalous behavior near the glass transition which is reflected in the presence of the minimum of the temperature dependence of the -relaxation time. To describe the peculiar behavior of process in dipolypropylene glycol we propose to use, besides the minimal model of Dyre and Olsen, the nonmonotonic relaxation kinetics model formulated by Ryabov et al..