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MELT VISCOSITY OF METALLOCENE ETHYLENE-OCTENE COPOLYMERS

Steady shear viscosity of a metallocene ethylene-octene copolymer was studied in a capillary rheometer at temperatures ranging from 110°C to 230°C. An equation to make pressure corrections for length-pressure relationships was used to obtain the wall shear stress and the end correction. From the wall shear stress the steady shear viscosity was calculated. Steady shear viscosity of the ethylene-octene copolymer showed higher activation energy than polyethylene. From the break in the plot of the end correction versus wall shear stress the critical stress for melt fracture was found to increase when temperature increased. However, from observation of the extrudate, the melt fracture occurred at a constant stress.