For the extensional case, [(4 [[II.sub.D]).sup.(1/2)] then is approximated by [square root of]6[member of] The Trouton ratio plot indicates the distinct differences between the PP and GFPP. The ratio for the PP is smaller; especially at low deformation rate.
The GFPP displayed less viscoelastic character in that the relaxation time constants are generally shorter than for the PP.
The GFPP results indicate more pronounced extensional effects.
This approach works with both transparent (in the case of PP) and opaque (in the case of GFPP) molding compounds.
15 for GFPP. Actual and predicted fronts do not correspond to the same filling times.
The principal purpose for comparing among PP and GFPP results was to illustrate the distinct differences among their kinematics in molds and therefore the need for different models for their behaviors.