Abstract
Composite curves of the viscoelastic functions may be obtained not only by the usual shift of isotherme data along the frequency axis, but also by a shift of the respective isochrones along the reciprocal temperature axis. This shift along the 1 / T axis is equivalent to that of the isochrones of dynamic viscosity, along the slope of zero shear apparent activation energy of flow. It is demonstrated that both types of shift are related to this zero shear activation energy of flow, so that an unique shift mechanism is effective in both cases. Isochrone based mastercurves are favourable for studies on polymer blends particularly, because the problematical choice of the reference temperatures of the components is circumvented.
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