Characterization and modelling of diffusion and reaction of low molecular weight reactants in molten polymer
Identifieur interne : 001244 ( Main/Exploration ); précédent : 001243; suivant : 001245Characterization and modelling of diffusion and reaction of low molecular weight reactants in molten polymer
Auteurs : Redha Bella [France] ; Francoise Fenouillot [France] ; Philippe Cassagnau [France] ; Laurent Falk [France]Source :
- Polymer : (Guildford) [ 0032-3861 ] ; 2007.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
A model reactive system was defined for studying experimentally and by simulation the competition between reaction and diffusion of two low molecular weight reactants, 2,3-epoxypropyl-phenylether (EPPE) and dipentylamine (DPA). Both reactants are miscible in a high-viscous molten polymer, poly(ethylene-co-vinyl acetate) (EVA). The comparison of the experimental rates of reaction for initially homogeneous samples and bi-layer unpremixed samples proved that the reaction was diffusion controlled. A kinetic model of the epoxy-amine reaction was coupled to mutual diffusion coefficients of reacting species in a transport model and the simulations were compared with experimental results. The diffusion/reaction process was finally related to typical mixing conditions encountered in reactive polymer processes. For the model reactive system, the simulations have established that actual mixing conditions with shear rate values encountered in polymer processing machines, were able to homogenize the system in less than 10 s. In other words, the reaction should no longer be controlled by molecular diffusion as soon as a relatively low intensity mixing is applied (shear rate > 10 s-1).
Affiliations:
- France
- Auvergne-Rhône-Alpes, Grand Est, Lorraine (région), Rhône-Alpes
- Nancy, Villeurbanne
- Centre national de la recherche scientifique, Laboratoire réactions et génie des procédés, Université de Lorraine
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Le document en format XML
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wicri:level="3"><inist:fA14 i1="01"><s1>IMP/LMM Laboratoire des Matériaux Macromoléculaires, CNRS UMR 5223, INSA-Lyon</s1><s2>69621 Villeurbanne</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Villeurbanne</settlement></placeName></affiliation></author><author><name sortKey="Cassagnau, Philippe" sort="Cassagnau, Philippe" uniqKey="Cassagnau P" first="Philippe" last="Cassagnau">Philippe Cassagnau</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Université de Lyon</s1><s2>Lyon, 69003</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region></placeName></affiliation><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>CNRS UMR5223, Ingénierie des Matériaux 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(région)</region></placeName><orgName type="laboratoire" n="5">Laboratoire réactions et génie des procédés</orgName><orgName type="university">Université de Lorraine</orgName><orgName type="institution">Centre national de la recherche scientifique</orgName></affiliation></author></analytic><series><title level="j" type="main">Polymer : (Guildford)</title><title level="j" type="abbreviated">Polymer : (Guildf.)</title><idno type="ISSN">0032-3861</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Polymer : (Guildford)</title><title level="j" type="abbreviated">Polymer : (Guildf.)</title><idno type="ISSN">0032-3861</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bilayers</term><term>Chemical reaction kinetics</term><term>Curing(plastics)</term><term>Diamine</term><term>EVA</term><term>Epoxy resin</term><term>Homogeneous mixtures</term><term>Interdiffusion</term><term>Kinetic model</term><term>Mass transfer with reaction</term><term>Model reaction</term><term>Modeling</term><term>Modified material</term><term>Theoretical study</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Epoxyde résine</term><term>Matériau modifié</term><term>EVA</term><term>Bicouche</term><term>Mélange homogène</term><term>Durcissement(matière plastique)</term><term>Diamine</term><term>Réaction modèle</term><term>Diffusion mutuelle</term><term>Transfert matière avec réaction</term><term>Cinétique chimique</term><term>Modélisation</term><term>Modèle cinétique</term><term>Etude théorique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A model reactive system was defined for studying experimentally and by simulation the competition between reaction and diffusion of two low molecular weight reactants, 2,3-epoxypropyl-phenylether (EPPE) and dipentylamine (DPA). Both reactants are miscible in a high-viscous molten polymer, poly(ethylene-co-vinyl acetate) (EVA). The comparison of the experimental rates of reaction for initially homogeneous samples and bi-layer unpremixed samples proved that the reaction was diffusion controlled. A kinetic model of the epoxy-amine reaction was coupled to mutual diffusion coefficients of reacting species in a transport model and the simulations were compared with experimental results. The diffusion/reaction process was finally related to typical mixing conditions encountered in reactive polymer processes. For the model reactive system, the simulations have established that actual mixing conditions with shear rate values encountered in polymer processing machines, were able to homogenize the system in less than 10 s. In other words, the reaction should no longer be controlled by molecular diffusion as soon as a relatively low intensity mixing is applied (shear rate > 10 s<sup>-1</sup>).</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Grand Est</li><li>Lorraine (région)</li><li>Rhône-Alpes</li></region><settlement><li>Nancy</li><li>Villeurbanne</li></settlement><orgName><li>Centre national de la recherche scientifique</li><li>Laboratoire réactions et génie des procédés</li><li>Université de Lorraine</li></orgName></list><tree><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Bella, Redha" sort="Bella, Redha" uniqKey="Bella R" first="Redha" last="Bella">Redha Bella</name></region><name sortKey="Cassagnau, Philippe" sort="Cassagnau, Philippe" uniqKey="Cassagnau P" first="Philippe" last="Cassagnau">Philippe Cassagnau</name><name sortKey="Cassagnau, Philippe" sort="Cassagnau, Philippe" uniqKey="Cassagnau P" first="Philippe" last="Cassagnau">Philippe Cassagnau</name><name sortKey="Falk, Laurent" sort="Falk, Laurent" uniqKey="Falk L" first="Laurent" last="Falk">Laurent Falk</name><name sortKey="Fenouillot, Francoise" sort="Fenouillot, Francoise" uniqKey="Fenouillot F" first="Francoise" last="Fenouillot">Francoise Fenouillot</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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