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Modeling of the rheological behavior of polyethylene/supercritical CO2 solutions

Identifieur interne : 001332 ( Main/Exploration ); précédent : 001331; suivant : 001333

Modeling of the rheological behavior of polyethylene/supercritical CO2 solutions

Auteurs : M. Nobelen [France, Belgique] ; S. Hoppe [France] ; C. Fonteix [France] ; F. Pla [France] ; M. Dupire [Belgique] ; B. Jacques [Belgique]

Source :

RBID : Pascal:06-0334164

Descripteurs français

English descriptors

Abstract

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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Le document en format XML

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<term>Capillary tube</term>
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<term>Experimental design</term>
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<term>Extrusion</term>
<term>Hydrodynamics</term>
<term>Modeling</term>
<term>Power law</term>
<term>Pressure drop</term>
<term>Second order</term>
<term>Shear</term>
<term>Supercritical state</term>
<term>Temperature effect</term>
<term>Theoretical model</term>
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<term>Modélisation</term>
<term>Carbone dioxyde</term>
<term>Etat supercritique</term>
<term>Viscosité</term>
<term>Tube capillaire</term>
<term>Presse extrusion double vis</term>
<term>Presse extrusion</term>
<term>Perte charge</term>
<term>Hydrodynamique</term>
<term>Plan expérience</term>
<term>Cisaillement</term>
<term>Ordre 2</term>
<term>Modèle théorique</term>
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<front>
<div type="abstract" xml:lang="en">This paper deals with the modeling of the rheological behavior of polyethylene (PE)/supercritical CO
<sub>2</sub>
solutions. Melt viscosity measurements were performed using a capillary tube die attached to a twin screw extruder, for different amounts of CO
<sub>2</sub>
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/CO
<sub>2</sub>
solutions depends on shear rate, temperature, pressure, and CO
<sub>2</sub>
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/CO
<sub>2</sub>
solutions with different shear rates. Correction factors were included to take into account the effects of temperature, pressure, and CO
<sub>2</sub>
concentration.</div>
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