| Titre : |
A dynamic model for multiple steady states in reactive extrusion |
| Type de document : |
texte imprimé |
| Auteurs : |
L. P. B. M. Janssen, Auteur ; P. F. Rozendal, Auteur ; M. Cioffi, Auteur ; H. W. Hoogsrtaten, Auteur |
| Année de publication : |
2001 |
| Article en page(s) : |
p. 263-271 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
668.9 Polymères |
| Résumé : |
The existence of multiple stationary values of the fully filled length in reactive extrusion is studies on the basis of a mathematical model describing extruder behavior. The extruder is modelled as a plug flow type of reactor. Through the introduction of travel time for a fluid element in the extruder, time dependent viscosity models following from rheokinetics can be used. Special attention is paid to ionic and radical polymerization reactions. Hysteresis behavior for stationary values of the fully filled length exists when die resistance and rotational speed are varied. The effects of reaction rate, viscosity levels and degree-of-fill on stable operation at high conversions are studied. The mathematical dynamic model presented here can account for some of the experimentally observed dynamic phenomena in the reactive extrusion of radical polymers. |
| Note de contenu : |
- MATHEMATICAL FORMULATION : Fluid dynamical aspects - The concept of travel time - Overview of the model
- RESULTS : Isoviscous case - Rheokinetic approach for polyaddition reactions - Rheokinetic approach for ionic and radical polymerisation (Influence of the rheonkinetic parameter n, Influence od rotational speed N, Influence of die resistance Kd, Influence of the viscosity ratio ninfini/n0, Influence of the reaction rate gamma, Influence of the leakage gaps in teh partially filled zone |
| DOI : |
10.3139/217.1651 |
| En ligne : |
https://drive.google.com/file/d/10R6T5J1iLndNTOjFo8MucZEhX_XWowWJ/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15907 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 3 (09/2001) . - p. 263-271
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