3. Results and discussion
3.1. Melt-viscosity of the blend components
In order to calculate the viscosity ratio, p, of the blend components corresponding to the applied processing conditions, capillary rheometry measurements were performed at the blending temperature of 260 °C. Because the melt-mixing in the mini-extruder has been performed at a constant screw speed of 80 rpm, the rheological behaviour of each component is best reflected by its melt-viscosity measured at a constant shear rate. Wu [15] stated that for his co-rotating twin-screw extruder, the shear rate, expressed in reciprocal seconds, has the same numerical value as the screw revolution per unit time (rpm). Although our twin-screw extruder specifications do not meet the one of Wu [15], we assume that the applied screw speed of 80 rpm for our experimental extruder coincides with a shear rate of 80 s−1. The melt-viscosity of all components as a function of the shear rate is presented in Fig. 1. In Table 1the melt-viscosity determined at 260 °C and 80 s−1 is given.
3. Results and discussion
3.1. Melt-viscosity of the blend components
In order to calculate the viscosity ratio, p, of the blend components corresponding to the applied processing conditions, capillary rheometry measurements were performed at the blending temperature of 260 °C. Because the melt-mixing in the mini-extruder has been performed at a constant screw speed of 80 rpm, the rheological behaviour of each component is best reflected by its melt-viscosity measured at a constant shear rate. Wu [15] stated that for his co-rotating twin-screw extruder, the shear rate, expressed in reciprocal seconds, has the same numerical value as the screw revolution per unit time (rpm). Although our twin-screw extruder specifications do not meet the one of Wu [15], we assume that the applied screw speed of 80 rpm for our experimental extruder coincides with a shear rate of 80 s−1. The melt-viscosity of all components as a function of the shear rate is presented in Fig. 1. In Table 1the melt-viscosity determined at 260 °C and 80 s−1 is given.
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