Abstract
The relation between Pressure–Volume–Temperature (PVT) and rheological behaviour of several polymers including polypropylene, poly(methyl methacrylate), polyamide, polycarbonate, polystyrene and polystyrene/polycarbonate blends was studied. Pressure–viscosity coefficient b = ( ∂ ln η 0 / ∂ P ) was calculated by means of a revisited version of the Miller equation that accounts for pressure and temperature effect on Newtonian viscosity through the activation energy of flow and PVT parameters. Pressure–temperature dependent viscosities experimentally determined using pressure chamber capillary rheometry allow us to check the approach of the Miller equation. Incorporating the pressure effect in the Carreau–Yasuda model for η ( γ ˙ ) allows establishing the viscosity curves of thermoplastics over a wide range of shear rates and pressures.
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