Abstract

PVC particle fractions prepared by air classification were used to study the effect of particle size and particle size distribution on viscosity, viscosity-shear rate, and viscosity time behavior. The results show that a broadening of the distribution leads to elimination of the shear instability and a decrease in the shear thickening (dilatant) observed at high shear rates. This change is found to be more pronounced when the size distribution is broadened by the addition of coarse particles. Addition of coarse particles is also shown to result in a reduction in the viscosity at low shear rates. The results are interpreted in terms of particle packing and electrokinetic effects.

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