Published : 2023-10-18

Rheological properties of polypropylene composites with calcium carbonate under high shear rates

Abstract

The rheological properties of isotactic polypropylene (iPP) and its composites with unmodified
and stearic acid-modified calcium carbonate (5, 10, 20, 30 wt%) were investigated. The processability
factor K of the composites was determined based on changes in the mass flow rate (MFR). The
assessment of rheological properties was carried out at high shear rates, in the injection process, using
a special in-line measuring head. Measurements were performed at a temperature of 230°C, in the range
of apparent shear rate from 19,100 to 101,900 s-1, based on the Ostwald-de Waele power-law model. Comparative
analysis of the processing and rheological characteristics, as determined with two techniques
(off-line measurements and in-line measurements), has shown a diverse behaviour of polymer composites
in flows (flow resistances, the behaviour of the flow and viscosity curves, the power law index),
resulting from a varying fill degree, applied filler type and measuring shear rate range.



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Kloziński, A., Lewandowski, K. ., Mirowski, J. ., Barczewski, M. ., & Jakubowska, P. . (2023). Rheological properties of polypropylene composites with calcium carbonate under high shear rates. Polimery, 68(7-8), 403–412. https://doi.org/10.14314/polimery.2023.7.6