Abstract
A new blending law for the viscoelastic constants of polymer melts in the terminal zone is proposed on the basis of the well known power law for viscosity ( η 0 ∼ M a w) and a simple assumption of the dependence of the weight-average relaxation time on molecular weight distribution. This blending law reduces to the modified Rouse model if the exponent a takes the value of 3. The recoverable compliance of binary blends can be calculated as a function of zero-shear viscosities and recoverable compliances of their components and of parameter a. Measurements have been carried out on binary blends of nearly monodisperse PS melts. For these results as well as for various experimental data from the literature, satisfactory agreement between calculated and experimental values of the recoverable compliance has been observed. The blending law is extended to polymer melts with continuous molecular weight distribution.
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