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Tensile stress and birefringence in polystyrene and polycarbonate melts have been measured at various temperatures during constant strain rate elongational flow. Deviations from the linear stress-optical rule appear at temperatures close to the Tg and are discussed by considering the total stress as the sum of an entropic and a non-entropic contribution. Anisotropy of properties below the Tg of samples where the chain orientation has been frozen-in by quenching, was characterized by thermal expansion measurements. A significant elastic recovery is found to occur at temperatures as low as Tg-30°C, and is discussed as a function of the thermomechanical history.

Посилання на статтю:

Stress-optical behaviour near the Tg and melt flow-induced anisotropy in amorphous polymers / R. Muller and J. J. Pesce // Polymer. – 1994. – Vol 35. – P. 734-739.

Stress-optical behaviour near the Tg and melt flow-induced anisotropy in amorphous polymers - Завантажити.