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A capillary rheometer to achieve an extremely high shear rate was developed and applied to some single polymer systems and blends of immiscible polymers. Flow curves of polycarbonate (PC), styrene-acrylonitrile copolymer (SAN) and their blends were obtained up to the shear rate of 107s-1. Only a first non-Newtonian region was observed for PC in the region. A second Newtonian region was observed for SAN in a high shear rate region (>2.7×106s-1); an increase in the viscosity was found at a shear rate of about 4×106s-1, above which the second non-Newtonian region appeared. Flow curves for immiscible polymer blends of SAN and PC were similar to that of the SAN with the three characteristic regions. The second Newtonian behavior began at a lower shear rate for blends than that for the SAN. For the calculation of the viscosityshear rate curves of blends, a concentric multi-layer model was proposed. It gave good agreement between the calculated and the measured values. It was generally confirmed by this model that viscosity of immiscible polymer blend is much affected by the component of lower viscosity (SAN in this case) because the shear rate of the layer of lower viscosity component is higher than that of the higher viscosity component in any flowing immiscible binary system.

Model for Computer Simulation of Flow Curves of Immiscible Polymer Blends