Abstract: The rheological behavior of two imported poly (phenylene sulfide) (PPS) was determined using a capillary rheometer, and the influences of shear rate and temperature on the rheological properties of PPS were studied. It was found that the non-Newtonian index was less than 1, and the dependence of the apparent melt viscosity on the temperature was reduced while the shearing rate was higher. The viscous flow activation energy of PPS melt was decreased with increasing shearing rate, and the structural viscosity index was decreased with the increasing temperature.

Key words: polyphenylene sulfide, rheological behavior, non-Newtonian index, viscous flow activation energy