Abstract
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.
Highlights
IntroductionInjection molding is the dominant method of processing polymer materials, due to the complexity of the structures of the obtained moldings (variations in shape, dimensions and mass) and the range of types of plastics that can be used
Injection molding is the dominant method of processing polymer materials, due to the complexity of the structures of the obtained moldings and the range of types of plastics that can be used
Figures from 1 to 3 show the plots illustrating the example of p-v-T characteristics for raw polypropylene Moplen RP2380 and with 10%, 20% and 30% filler contents, respectively, obtained for selected pressure
Summary
Injection molding is the dominant method of processing polymer materials, due to the complexity of the structures of the obtained moldings (variations in shape, dimensions and mass) and the range of types of plastics that can be used. For the proper use of injection molding programs and the correct analysis of the results obtained, it is necessary to have the necessary knowledge about rheological phenomena occurring during injection, because CAE programs used to simulate this processing method use various rheological models describing the behavior of the material under high pressure temperature. Processing of polymer materials (mainly injection and extrusion) are described as three-dimensional, complex, non-Newtonian and non-isothermal flow, and sometimes as transient flow. The viscosity of polymers depends mainly on the shear rate and decreases with increasing this rate, it varies depending on the temperature and pressure. The polymer viscosity decreases with increasing temperature, and increases with increasing pressure [2, 9, 17]
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