Rheological data weremeasured at temperatures of 200 C, 210 C and 220 C for all the blends over a 10 to 6000 (s1) shear rate range. The pressure drop for a given volumetric flow rate or shear rate was measured simultaneously for both dies and the capillary rheological data were subjected to Bagley and Weissenberg-Rabinowitsch corrections to determine the true shear rate (g_ w) and the true shear stress (tw).