The dynamic yield stress for polycarbonate, polystyrene and poly(methyl methacrylate) was measured by an instrumented Charpy impact tester in a wide temperature range. The dynamic yield stress is interpreted as being proportional to a negative pressure. The temperature dependence can be described by a Williams–Landel–Ferry type of equation. The extrapolation to ambient pressure leads to the main a transition and is used to connect the dynamic yield stress to the pressure dependence of the a dispersion zone.
Посилання на статтю:
Temperature dependence of dynamic yield stress in amorphous polymers as indicator for the dynamic glass transition at negative pressure / R. Lach, W. Grellmann, K. Schröter, E. Donth, // Polymer. – 1999. – N 40. – P. 1481–1485.