Abstract
The dynamic mechanical spectra in the glass transition region of miscible blends show an extraordinaryly broad transition zone when the blend has a high concentration of poly(vinylethylene). The application of the coupling model to the data suggests that this breadth is a manifestation of an inhomogeneous distribution of relaxation times and coupling parameters engendered by concentration fluctuations. A consequence of this dynamical heterogeneity is deviation from the principle of time-temperature superpositioning for miscible polymer mixtures in the glass transition region
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