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The article informs that the addition of inorganic filler has been one of the important methods for the modification of polymeric materials. Recently, increasing attention has been devoted to developing polymer/graphite composites for some important applied cases in which electrical or/and thermal conductivity is required. It is evident that the rheological and mechanical properties of the particle filled polymer composites are much different from those of virgin polymers. Many researchers have paid their interests to the viscoelasticity of the particle filled polymer composites over the past several decades.

Discusses the temperature-dependent dynamic rheological properties of polypropylene filled with ultra-fine powdered rubber. Observation of the phenomenon called second plateau in rheology, which is the formation of ordered structure/morphology induced by aggregation of fillers and a phase-separated system; Toughening effect on polypropylene using ultra-fine powdered rubber.