AbstractThe dynamic mechanical properties in terms of the storage modulusE′, loss modulusE″, and the loss tangent δ has been studied for highly filled magnetic polymer composites. The effect of surface treatment on the relaxation spectra has been clearly elucidated and quantitative values indicating the extent of polymer–filler interactions have been given. Various models have been tested for describing the viscoelastic behavior of such highly filled systems. The Wiechert model using a single‐arm with a Cole–Cole parameter has been shown to effectively fit the Argand diagram in the case of the present highly fill
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