Abstract
Narrow molecular weight distribution polystyrenes and their blends, with molecular weights exceeding M c′ have been measured in the molten state by means of a Contraves-Kepes balance rheometer. The vertical and the horizontal shift factors are the same for the fractions and their blends. In the terminal zone, the effect of blending on the complex viscosity η∗ and its imaginary η″ results in the appearance of two fields representing the respective contributions of both components to the blend. The importance of the coupling between both fields as a function of the weight ratio of both components is discussed. The zero-shear viscosity η 0 is equal to that of a narrow molecular weight distribution polystyrene having the same weight-average molecular weight M w′ measured at the same temperature.
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