Abstract
The pressure oscillation phenomenon can be observed at the onset of the wall-slip phenomenon during extrusion of a polymer fluid, which is an important characteristic of the viscoelasticity of the fluid. In this work, the extrusion properties of two natural rubber (NR)/cis-polybutadiene rubber (BR) blends filled with carbon black are measured by using a Monsanto Processability Tester (MPT) in the temperature range 90–130 oC and shear rates varying from 50 to 10 3 s −1, to identify the effects of the die geometry, temperature and shear rate on the pressure losses. It was found that the total pressure drop during extrusion of the samples decreased with increase of the die diameter and rise of temperature, whereas it increased with increasing shear rate. Furthermore, some pressure fluctuation phenomena were observed under these test conditions. This suggests that wall-slip phenomenon occurs during capillary extrusion flow of the samples under the experimental conditions. The results showed that critical shear rates for onset of the pressure oscillation phenomena increased with increasing die diameter and with a rise of temperature.
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