Abstract
Macroscopic loss factors of a sea-island type polymer alloy are calculated by the use of the equivalent inclusion method combined with the Mori-Tanaka theorem. Effects of the shape of the island particles on the macroscopic loss factors of the polymer alloy are examined under the tensile applied stresse. Consequently, it is found that the polymer alloy whose value of the macroscopic loss factor is 5-10 times as large as one of the matrix polymer can be obtained by choosing the paticles whose aspect ratio is less than 0.1. Moreover, a value of the macroscopic elastic modulus of the polymer alloy can be maintained at one of the matrix polymer by adding glass particles whose aspect ratio is less than 1.0 into the matrix of the polymer alloy.
