| Abstract
| - A novel method for determining the mutual diffusion coefficient using rheometry ispresented. The method includes mathematical modeling for mutual diffusion at polymer/polymer interfacesand experimental determination of material parameters for the model. The model combines the conceptsof the reptation theory and the fast-mode model applied to miscible dissimilar polymers brought intointimate contact in the molten state. The material parameters for the model are obtained from experimentsin which the dynamic complex shear modulus, G*, is measured in parallel-plate geometry under smallamplitude of deformation as a function of time and frequency for a sandwich-like assembly. The techniquewas applied to the poly(methyl methacrylate) (PMMA)/poly(styrene acrylonitrile) (SAN) system, and themeasured mutual diffusion coefficient was found to be in agreement with the values reported in theliterature for the same system.
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