Numerical and physical modeling of polymer crystallization / Jean-Marc Haudin in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 3 (09/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 3 (09/2004) . - p. 267-274 Titre : Numerical and physical modeling of polymer crystallization : Part I : Theoretical and numerical analysis Type de document : texte imprimé Auteurs : Jean-Marc Haudin, Auteur ; J.-L. Chenot, Auteur Année de publication : 2004 Article en page(s) : p. 267-274 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this first paper, we have revisited Avrami’s model and cast its basic equations into a differential system. This system is integrated numerically, which avoids unnecessary simplifying assumptions generally used in order to get analytical expressions. This allows us to introduce the variations of nucleation and growth parameters as a function of processing ones (temperature, cooling rate, shear rate, etc.). Our analysis shows that it is necessary to take into account the variation of the initial number of potential nuclei with temperature, which was usually ignored. Finally, an outpout of our calculations is the size distribution of the morphological entities, i. e., a quantitative information on microstructure. DOI : 10.3139/217.1829 En ligne : https://drive.google.com/file/d/1_xtzUsPZe2G4i-Ljb7y0NQnh8swrpvtS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3109 [article]

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Numerical and physical modeling of polymer crystallization / B. Monasse in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 3 (09/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 3 (09/2004) . - p. 275-286 Titre : Numerical and physical modeling of polymer crystallization : Part II : Isothermal and non-isothermal crystallization kinetics of a polypropylene in 2 dimensions - Experiments and simulation Type de document : texte imprimé Auteurs : B. Monasse, Auteur ; J. Smirnova, Auteur ; Jean-Marc Haudin, Auteur ; J.-L. Chenot, Auteur Année de publication : 2004 Article en page(s) : p. 275-286 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Crystallization of thin polypropylene films was performed in isothermal, constant cooling-rate and mixed conditions. The experiments were first analyzed using the classical procedures based on simplified forms (Avrami, Ozawa) of the general Kolmogoroff-Avrami-Evans (KAE) theory. These analyses, which can be applied over an unusually wide transformation range, show that the crystallizations are actually 2 D. Then, a procedure has been established for the determination of the nucleation and growth parameters involved in the theoretical model presented in the first paper of this series. These parameters have been introduced into the model in order to predict the crystallization behavior in isothermal, constant-cooling-rate and mixed-conditions: transformed fraction, number of activated nuclei, final size distribution of semi-crystalline entities. A very good agreement is generally found between predictions and experimental results. DOI : 10.3139/217.1830 En ligne : https://drive.google.com/file/d/1i3qUhiTWRDJ104QkMUH9AnVbQLVZbLre/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3111 [article]

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Structure development in injection molding / J. Smirnova in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 2 (06/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 2 (06/2005) . - p. 178-185 Titre : Structure development in injection molding : A 3D simulation with a differential formulation of the kinetic equations Type de document : texte imprimé Auteurs : J. Smirnova, Auteur ; Jean-Marc Haudin, Auteur ; J.-L. Chenot, Auteur ; B. Monasse, Auteur ; L. Silva, Auteur Année de publication : 2005 Article en page(s) : p. 178-185 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The purpose of the present work is to introduce a crystallization law into Rem3D, a 3D code written in C++ and dedicated to the injection molding of polymers. We kept the basic hypotheses of Avrami’s model and cast the kinetic equations into a differential system that is solved numerically. The variation of the density of potential nuclei with temperature is taken into account. Furthermore, the distribution of mean spherulite sizes can be deduced from the calculations. The second part of the paper is an experimental study of crystallization in well-controlled conditions (2D, isothermal or constant cooling-rate). It establishes a procedure for the determination of the nucleation and growth parameters used in the theoretical model, and gives a first validation of this model. Finally, the crystallization equations are introduced into Rem3D, in order to assess the feasibility of our new approach. Some typical results concerning the evolution of the transformed volume fraction in injection-molded parts are presented. DOI : 10.3139/217.1873 En ligne : https://drive.google.com/file/d/1g_0Bi-rQei21aYdF2fLHNmTclWCrnS0F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3078 [article]

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