| Titre : |
Crystallization of polymers in processing conditions : An overview |
| Type de document : |
texte imprimé |
| Auteurs : |
Jean-Marc Haudin, Auteur ; Séverine A. E. Boyer, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 545-554 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cristallisation
Mesure de pression-volume-température
Modèles mathématiques
Polypropylène
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
In polymer processing, crystallization generally occurs in complex, inhomogeneous and coupled mechanical (flow, pressure), thermal (cooling rate, temperature gradient) and geometrical (surface of processing tools) conditions. A first route to understand crystallization in processing conditions is to design model experiments to isolate the specific influence of a given parameter. The emphasis will be laid here on the influence of: (i) shear flow through rheo-optical measurements using the commercial RheoScope module, (ii) high cooling rates obtained with the modified hot stage Cristaspeed (up to 2 000 °C min?1) and (iii) high pressures in the original Cristapress cell (up to 200 MPa). Numerical simulation is also a useful tool to understand and predict the coupled phenomena involved in crystallization. Based on Avrami's ideas and equations, a general differential formulation of overall crystallization kinetics has been proposed by Haudin and Chenot (2004). It is able to treat both isothermal and non-isothermal cases, and has been extended to crystallization in a limited volume without and with surface nucleation inducing transcrystallinity. |
| Note de contenu : |
- EXPERIMENTAL : Material - Crystallization under shear - Crystallisation at high cooling rate - Crystallisation under pressure
- EXPERIMENTAL RESULTS AND DISCUSSION : Shear-induced crystallisation - Growth rate from high cooling rate experiments - Growth rate under pressure
- MODELING |
| DOI : |
10.3139/217.3415 |
| En ligne : |
https://drive.google.com/file/d/1Ph4rWSoaIEMzuP_jbO4nBPI9rmmqO2sG/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29420 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 5 (11/2017) . - p. 545-554
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Crystallization of polymers in processing conditions : An overview in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)
