Abstract
The flow behaviour of three high impact polystyrene (HIPS) melts in extrusion has been investigated by using a capillary rheometry in a wide range of shear rates. It was found that the relationship between end pressure drop and apparent shear rate approximately obeyed the index law; the shear flow behaviour of the sample melts was more in keeping with the index law at higher shear rates than at lower shear rates; and the dependence of the apparent shear viscosity on temperature could be described by the Arrhenius equation under the experimental conditions. On the basis of comparison of the shear-sensitivity and the temperature-sensitivity for the melts, the relationship between steady-shear melt viscosity and molecular parameters was discussed.
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