AbstractAn attempt was made to evaluate the apparent elastic constant of a two‐phase systemGfrom those of the components of the system. The modulusGis expressed as follows:documentclass{article}pagestyle{empty}begin{document}$ G = G_1 frac{{left( {7 - 5v_1 } right)G_1 + left( {8 - 10v_1 } right)G_2 - left( {7 - 5v_1 } right)left( {G_1 - G_2 } right)v}}{{left( {7 - 5v_1 } right)G_1 + left( {8 - 10v_1 } right)G_2 + left( {8 - 10v_1 } right)left( {G_1 - G_2 } right)v}} $end{document}whereG1andG2are the shear moduli of the suspending medium and the suspended particles, respectively,v1is the Poisson ratio of the medium, andvis the volume fraction of the particles. The results for modulus were extended to dynamic viscoelasticity by the corresponding principle. Experimental verifications with dynamic viscoelasticity data were conducted for the system of styrene‐acrylonitrile copolymer interpolymerized with polybutadiene particles. For shear viscosity comparisons with experiment were made for the system linear polyethylene‐polybut
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