Abstract

            Optical birefringence measurements were used to observe the isothermal relaxation of rubbed polystyrene films on silica substrates below the glass transition temperature. The relaxation dynamics were described by Kohlrausch-Williams-Watts relaxation function with Arrhenius temperature dependence of relaxation time. The isothermal results were in good agreement with results obtained using a 1 K min^-1 heating rate.