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Nondivergence of the Viscosity of Inorganic and Polymeric Glasses near the Glass Transition Temperature

The temperature dependence of the viscosity of metaphosphate glasses and polystyrene was measured in the liquid and glass states using a method developed by the authors. The results do not show a divergence of viscosity near the glass transition temperature, Tg, which many theories predict, but do follow an Arrhenius equation below Tg. It is shown that the intermediate range order is strongly related to the glass transition mechanism. The kinetic (viscous) transition was discovered at a temperature lower by approximately 20°C than the Tg thermally determined using a differential scanning calorimeter.