Abstract
Effects of shear heating on the measurement of polymer melt viscosity was studied for AS and ABS copolymers where A, S, and B stand for acrylonitrile, styrene, and butadiene, respectively. Melt viscosity under the high shear rate γ in a range from 102 to 105 s−1 was observed by two slit dies of different thicknesses and connected to the head of the injection molding machine. Agreement between the data for the dies became poor with increasing shear rate and the discrepancy could not be neglected at shear rates higher than 103 s−1. The discrepancy was assumed to be caused by shear heating and an attempt was made to correct the viscosity curve by taking this effect into account. By introducing an Arrhenius type relation for the temperature dependence of viscosity, fairly good agreement was obtained for measurement of viscosity with different dies. A single curve of the shear stress τw as a function of γ was obtained.
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Kurihara, F., Kimura, S. An Experimental Study of the Viscosity of Polymer Melts at High Shear Rate. Polym J 17, 863–868 (1985). https://doi.org/10.1295/polymj.17.863
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DOI: https://doi.org/10.1295/polymj.17.863