Untersuchungen Über die Lineare Volumennachwirkung bei Amorphen Hochpolymeren

Abstract

AbstractMeasurements of isothermal‐isobaric volume retardation occurring in atactic polystyrene after temperature and pressure jumps applied to the material are reported. The volume post‐effect could be measured at very small deviations from internal equilibrium and therefore linear retardation behavior was obtained. In this case, different kinetic theories give an exponential time dependence of volume deviation from the equilibrium value due to the presence of a single reatrdation time. This prediction was not corroborated by our experiments. It was found that the isothermal‐isobaric volume post‐effect could not be described, at least with styrene, by a single retardation time but that it was necessary to assume a retardation time distribution.