Comparison of rheological oscillatory data results in the form of Cole-Cole plots, i.e., changes of η" in the η' function, allow for a qualitative assessment of the miscibility or compatibility of the polymeric blends and composites ). The material is assumed to be compatible or miscible when the curves are arranged as smooth semicircle shapes . With the increasing deviation from the model curve, which considers the flattening of the curves in the range of high viscosity values, the results indicate the occurrence of chemical interactions (in the case of partially cross-linked polymers) or the presence of physical interactions in the polymer bulk. In the considered case, only PBS/M-PL shows limited miscibility of the system resulting from physical interactions between the agglomerated filler particles or/and strong interfacial bonding in the polymer-filler interface.