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Article Dans Une Revue Chemical Engineering Science Année : 2006

Modeling of the rheological behavior of polyethylene/supercritical CO2 solutions

Résumé

This paper deals with the modeling of the rheological behavior of polyethylene (PE)/supercritical CO2 solutions. Melt viscosity measurements were performed using a capillary tube die attached to a twin screw extruder, for different amounts of CO2 injected into the extruder barrel (from 0 to 4 wt%). The viscosity of the solutions was determined by measuring the pressure drop and the polymer flow rate through the die. A D-optimal experimental design was developed to determine the minimal number of experiments necessary with a minimization of the error on the model coefficients. The experimental results showed that the viscosity of PE/CO2 solutions depends on shear rate, temperature, pressure, and CO2 concentration. The pressure in the capillary was modeled by a second order polynomial. A theoretical model based on a power law was proposed to describe the pseudoplastic behavior of PE/CO2 solutions with different shear rates. Correction factors were included to take into account the effects of temperature, pressure, and CO2 concentration.
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Dates et versions

hal-00280909 , version 1 (20-05-2008)

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  • HAL Id : hal-00280909 , version 1

Citer

M. Nobelen, S. Hoppe, Ch. Fonteix, F. Pla, M. Dupire, et al.. Modeling of the rheological behavior of polyethylene/supercritical CO2 solutions. Chemical Engineering Science, 2006, 61 (16), pp.5334-5345. ⟨hal-00280909⟩

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