Fig. 7.7 (a) Viscosity versus shear rate curve of polypropylene (melting index 8 g/10 min under
2.16 Kg and 230C) at 230C, and the applicable methods in various regions (Gahleitner 2001 )
(Reprinted with permission); (b) Illustration of polymer melt viscosity changing with shear rates
and various influence factors (see the text for the details)
Fig. 7.8 Illustration of the de-coupling of shear flow into extensional flow and rotating flow
7.2 Characteristics of Polymer Flow 135