Abstract :
The flow properties of polypropylene(PP)/ethylene-propylene-diene monomer
copolymer(EPDM)/glass bead (GB) ternary composites were measured in a wide scope of
shear rates by using a Rosand capillary rheometer. The apparent shear rates varied from
10 to 105 s−1, and the test temperature was from 210 to 240◦C. The results showed that the
flow behavior of the composite melts may be considered to approximate that of a power
law fluid although the slope of the melt flow curves somewhat varied around shear rate of
700 s−1. The dependence of the melt shear viscosity on the test temperature was roughtly
consistent with the Arrhenius expression. The melt shear viscosity increased dramatically
with increasing the volume fraction (φg) of GB under lower shear rate level, white it
increased gently with an addition of φg under higher shear rate level. Furthermore, there
were certain effects of the filler surface treatment on the melt shear viscosity and its
sentivity to the filler content at higher concentration of the beads at lower shear rates.
C 2005 Springer Science + Business Media, Inc.
