Molecular motions and transitions in a poly(p-hydroxystyrene) derivative

The dielectric relaxation mechanisms in a poly(p-hydroxystyrene) derivative have been studied by Thermally Stimulated Depolarization Currents (TSDC) i n the temperature range between - 160 and 130 degrees C. A broad relaxation was observed at low temperatures, from -160 up to 0 degrees C, which obeye d to the zero entropy approximation. In contrast, the glass transition rela xation showed the usual behavior, a strong departure to the zero entropy pr ediction. Both relaxations have been studied in detail by the technique of thermal sampling. The thermal behavior of this poly(p-hydroxystyrene) deriv ative was also studied by Differential Scanning Calorimetry in the temperat ure range between 20 and 200 degrees C. (C) 1999 John Wiley & Sons, Inc.