Abstract
The macroscopic shear modulus and the loss factor of a sea-island type polymer alloy are evaluated under the shear applied stress by using the equivalent inclusion method combined with the Mori-Tanaka theorem. The effects of the shear modulus and the loss factor of the spherical island particle on the macroscopic loss factor of the polymer alloy are clarified in the form of the two-dimensional contour map. Moreover, it is found that an optimum range on the magnitude of the shear modulus of the particle in the polymer alloy exists for its larger macroscopic loss factor, and the additional voids in the matrix play an effective role in decreasing in the macroscopic shear modulus and in the further increase in the macroscopic loss factor of the polymer alloy.
