Modeling of the rheological behavior of polyethylene/supercritical CO2 solutions
Identifieur interne : 001332 ( Main/Exploration ); précédent : 001331; suivant : 001333Modeling 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 :
- Chemical engineering science [ 0009-2509 ] ; 2006.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
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.
Affiliations:
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Le document en format XML
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<author><name sortKey="Fonteix, C" sort="Fonteix, C" uniqKey="Fonteix C" first="C." last="Fonteix">C. Fonteix</name>
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<series><title level="j" type="main">Chemical engineering science</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Capillary tube</term>
<term>Carbon dioxide</term>
<term>Correction factor</term>
<term>Double screw extruder</term>
<term>Experimental design</term>
<term>Extruder</term>
<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>
<term>Viscosity</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><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>
<term>Loi puissance</term>
<term>Facteur correction</term>
<term>Effet température</term>
<term>Extrusion</term>
</keywords>
</textClass>
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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>
</front>
</TEI>
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<li>France</li>
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<region><li>Grand Est</li>
<li>Lorraine (région)</li>
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<tree><country name="France"><region name="Grand Est"><name sortKey="Nobelen, M" sort="Nobelen, M" uniqKey="Nobelen M" first="M." last="Nobelen">M. Nobelen</name>
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<name sortKey="Fonteix, C" sort="Fonteix, C" uniqKey="Fonteix C" first="C." last="Fonteix">C. Fonteix</name>
<name sortKey="Hoppe, S" sort="Hoppe, S" uniqKey="Hoppe S" first="S." last="Hoppe">S. Hoppe</name>
<name sortKey="Pla, F" sort="Pla, F" uniqKey="Pla F" first="F." last="Pla">F. Pla</name>
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<country name="Belgique"><noRegion><name sortKey="Nobelen, M" sort="Nobelen, M" uniqKey="Nobelen M" first="M." last="Nobelen">M. Nobelen</name>
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<name sortKey="Dupire, M" sort="Dupire, M" uniqKey="Dupire M" first="M." last="Dupire">M. Dupire</name>
<name sortKey="Jacques, B" sort="Jacques, B" uniqKey="Jacques B" first="B." last="Jacques">B. Jacques</name>
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</record>
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