Abstract
The rheological properties of surface treated and untreated CaCO3-high-density polyethylene composites were studied and related to particle–particle and particle-matrix interactions. Steady shear rheological measurements on composites with different loading (0–30 vol %) were carried out with preshear treatment prior to the measurements, duration of kneading during compounding, and surface treatment (stearic acid) of the filler as variable parameters. The steady state shear viscosity massively increased with increasing filler volume fraction due to the presence of a small number of agglomerates. Although no polymer was entrapped within the agglomerates, their presence led to massive increase in shear viscosity. The rheological response proved to be a more sensitive test for filler dispersion than scanning electron microscopy and shear thinning beyond that of the polymer matrix was observed, due to deagglomeration of the filler. The presence of agglomerates also led to a stress overshoot in the step shear r...
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