STUDY OF THE DYNAMIC STRUCTURE FACTOR IN THE BETA-RELAXATION REGIME OF POLYBUTADIENE

Using neutron spin echo and dielectric spectroscopy we have studied th e molecular motions of 1-4 polybutadiene in the alpha-beta relaxation regime. At the first peak of the static structure factor the relaxatio n times follow the temperature dependence of the viscosity, while near the second peak the Arrhenius law of the beta relaxation is observed. Considering localized motions on a length scale of 1.5 Angstrom with the barrier distribution from dielectric spectroscopy the dynamic stru cture factor in the beta relaxation regime can be described quantitati vely.