A dynamic model for multiple steady states in reactive extrusion / L. P. B. M. Janssen in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 3 (09/2001) . - p. 263-271 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 [article]

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Flow characteristics of screws and special mixing enhancers in a Co-rotating twin screw extruder / T. Brouwer in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 1 (03/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 1 (03/2002) . - p. 26-32 Titre : Flow characteristics of screws and special mixing enhancers in a Co-rotating twin screw extruder Type de document : texte imprimé Auteurs : T. Brouwer, Auteur ; David B. Todd, Auteur ; L. P. B. M. Janssen, Auteur Année de publication : 2002 Article en page(s) : p. 26-32 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The flow behavior of a Newtonian fluid through special mixing enhancers in a modular intermeshing co-rotating twin screw extruder has been examined. The mixing enhancers are slotted screws and gear mixing elements. Particular attention has been directed to drag and pressure flow characteristics and residence time distribution in such devices. The data obtained are useful for guidance in the selection of appropriate mixing elements and validation of flow simulation models for twin screw extruders. DOI : 10.3139/217.1678 En ligne : https://drive.google.com/file/d/1gO6RsgBoWJ0jY2hG-ULR66X9AcVuZI49/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15958 [article]

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State of the art : recycling of EPDM rubber vulcanizates / P. Sutanto in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 2 (05/2006) . - p. 211-217 Titre : State of the art : recycling of EPDM rubber vulcanizates Type de document : texte imprimé Auteurs : P. Sutanto, Auteur ; J. W. M. Noordermeer, Auteur ; W. K. Dierkes, Auteur ; K. A. J. Dijkhuis, Auteur ; L. P. B. M. Janssen, Auteur ; F. Picchioni, Auteur Année de publication : 2006 Article en page(s) : p. 211-217 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Since the past few decades, environmental issues have become a serious concern in society. It is a requisite for the industry tominimize waste, in order to protect the environment from being polluted. The term waste here comprises processing waste and post-consumer waste. The amount of processing waste should not be underestimated since it might consist of approximately 10% of the total production. The recycling of EPDM rubber is an interesting topic, especially if considered in connection with the continuous market growth of EPDM. This paper is a summary of efforts that have been taken so far on this subject. Studies done on EPDM recycling include reusing EPDM as filler in new rubber products and chemical, thermal, and mechanical devulcanization of EPDM in order to achieve a material that resembles the virgin one and could be revulcanized. Such studies on EPDM recycling are discussed extensively and in the conceptual frame of more general rubber recycling processes. DOI : 10.3139/217.1906 En ligne : https://drive.google.com/file/d/1abzODi-xDPEVwM2xjGeVsI638sHV6MgC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2916 [article]

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The reactive extrusion of thermoplastic polyurethane and the effect of the depolymerization reaction / V. W. A. Verhoeven in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 3 (07/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 3 (07/2006) . - p. 295-308 Titre : The reactive extrusion of thermoplastic polyurethane and the effect of the depolymerization reaction Type de document : texte imprimé Auteurs : V. W. A. Verhoeven, Auteur ; L. P. B. M. Janssen, Auteur ; K. J. Ganzeveld, Auteur ; A. D. Padsalgikar, Auteur Année de publication : 2006 Article en page(s) : p. 295-308 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The reactive extrusion of thermoplastic polyurethane in a corotating twin-screw extruder was investigated. The polyurethane system consisted of a mixture of 2,4-diphenylmethane diisocyanate (2,4-MDI) and 4,4-MDI, methyl-propane-diol and a polyester polyol. An engineering extrusion model was designed and compared with experimental results. In this validation study the catalyst level, throughput, rotation speed and the barrel wall temperature was varied. A comparison of the experiments with the model showed that the model captured the polyurethane extrusion fairly well. Furthermore, the effect of the depolymerization reaction on the polyurethanes extrusion was investigated. It was found that the extruder operation is gravely affected by the depolymerization reaction: the depolymerization reaction limits the maximal obtainable conversion, stabilizes the extruder operation, and causes undesired post-extrusion curing of the polyurethane. DOI : 10.3139/217.0101 En ligne : https://drive.google.com/file/d/1sqqOFkmrSqcb8m1mlHWVJdj2LPkVEf4q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2844 [article]

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