Abstract
A semi-empirical blending rule for the components of the complex shear viscosity of homopolymer melts is shown to be valid over a broad range forunbranched polymers. The experimental results from the literature and the authors own data for PS, HDPE and polybutadiene agree reasonably with the results of the blending rule; this holds at least as long as the molecular weight ratio of the components does not exceed ten. The application of the blending rule totally fails for the extreme case of a star branched component at small frequencies of oscillation. The rule allows a convenient quantitative description of phenomena known from experience, e.g., (1) the admixture of high molecular weight components may drastically enhance elastic properties of the melt; (2) the admixture of low molecular weight polymer components eases processing without lowering the zero-shear viscosity too much, as e.g. plasticizers would do.
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