Comparison of off-line,on-line and in-line measuring techniques used for determining the rheological characteristics
of polyethylene composites with calcium carbonate (in English)
Polimery 2019, No 2, 83
The articlehas presented comparative tests of the rheological characteristics oflow-density polyethylene (LDPE) with an addition of calcium carbonate (CaCO3), containing 7, 14, 21 and 28 wt % of filler, respectively. The measurements were carriedout by an off-line measuring technique (using a modified dead-weight plastometer), an on-line measuring technique (with a gear pump capillary rheometer) and an in-line measuring technique (with an extruder rheometer). The rheological parameters of the polymeric materials were determined based on the Ostwald-de-Waele power-law model at a temperature of 170 °C. The effect of calcium carbonate addition on the characteristic of operation of each of the employed instruments, the flow curves, the viscosity curves, and the values ofpower-law index (n) and consistency factor (K) have been determined.