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In this study, the effects of dyes, which were dispersed in atactic polystyrene, on the enthalpy relaxation process was studied in order to investigate the mechanism of molecular motion at temperatures below Tg. Dyes used through were p-aminoazobenzene and C. I. Disperse Yellow 7. It is convenient to express the enthalpy changes that occur during isothermal annealing at a glassy state in terms of the excess enthalpy. The kinetics of the enthalpy relaxation was analyzed with the assumption of single relaxation time process. With an increase in the content of dyes, Tg of polymer decreased, the relaxation time of the enthalpy relaxation became long and the apparent activation energy increased. The longer the molecular length is, the lower Tg of polymer and the slower the rate of the enthalpy relaxation become.

THE EFFECTS OF DYES ON THE RATES OF ENTHALPY RELAXATION OF POLYSTYRENE WITH ANNEALING AT TEMPERATURES BELOW ITS GLASS TRANSITION TEMPERATURE