Numerical Modeling of p-v-T Rheological Equation Coefficients for Polypropylene with Variable Chalk Content

Abstract

The paper reports the experimental results of a study investigating the effect of different contents of a mineral filler on the rheological properties, p-v-T, of polypropylene. Using the pvT100 apparatus, we measured specific volume under isobaric cooling at different pressures for pure polypropylene and chalk-filled polypropylene (10 wt%, 20 wt% and 30 wt%). Next, we employed computer methods to determine the coefficients of a mathematical model describing the variations in specific volume in a function of temperature and pressure. The model was used in the numerical simulations of injection molding and shrinkage processes.

Keywords

• numerical modelling
• chalk
• filler
• poly(propylene)
• thermal properties