Effect of conversion on chain addition copolymerizations performed in a backmixed drag flow extruder reactor / J. Grenci in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 2 (06/2000) . - p. 147-156 Titre : Effect of conversion on chain addition copolymerizations performed in a backmixed drag flow extruder reactor Type de document : texte imprimé Auteurs : J. Grenci, Auteur ; David B. Todd, Auteur Année de publication : 2000 Article en page(s) : p. 147-156 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The use of a drag flow device such as a twin screw extruder for polymerization and/or copolymerization processes has been studied extensively over the years. Due to the high viscosities (100 to 100 000 poise) that are produced, poor backmixing is experienced in these drag flow devices. As a result, these studies have shown the extruder reactor to exhibit a ``plug flow'' behavior. A drag flow device has been developed that achieves good backmixing with high viscosity materials. This device incorporates two counter-rotating, nonintermeshing, screws; one screw conveying material forward, while the other conveying material backward. Theory suggests that in a plug flow reactor the copolymer composition varies (drifts) as a function of time (position) in the reactor in most cases. Conversely in a micromixed continuous stirred tank reactor (CSTR) the copolymer produced does not drift as a function with position in the reactor. It has also been shown that this drift in copolymer composition becomes more pronounced at higher conversion. Experiments were performed in a counter-rotating nonintermeshing twin screw extruder using the "backmixed" config-uration and a "conventional" configuration. Two copolymer systems were investigated; butyl acrylate/styrene and butyl acrylate/butyl methacrylate. The copolymerizations were conducted at three residence times for each system and configuration to provide materials of a wide variety of conversions (13 to 97 %). Monomer samples were taken at two ports in the extruder and at the die. Samples were analyzed for composition by two methods; FTIR and refractive index (RI). It was shown that the copolymer composition of samples produced in the backmixed extruder reactor does not change significantly as a function of position in the reactor. This is an indication that the copolymer composition does not drift in the reactor. Theoretically this is the behavior that exists with a chain addition copolymerization that occurs in a CSTR. Two methods (RI, FTIR) were used in the copolymer formulation (BA/Sty) and one method (FTIR) was used in the other copolymer formulation (BA/BMA). It was further shown that the difference in copolymer compositions in the two extruder reactors is more pronounced at higher conversions than at lower conversions. DOI : 10.3139/217.1591 En ligne : https://drive.google.com/file/d/1yedCOs7ZxnPOim-KMz1as1qEvar83rPa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16053 [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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Plastics compounding / David B. Todd / Munchen [Germany] : Hanser (1998)

Titre : Plastics compounding : Equipment and processing Type de document : texte imprimé Auteurs : David B. Todd, Editeur scientifique Editeur : Munchen [Germany] : Hanser Année de publication : 1998 Importance : XV-288 p. Présentation : ill. Format : 25 cm ISBN/ISSN/EAN : 1-569-90236-4 Note générale : Terminologie - Abbréviations des polymères - Index - Bibliogr. Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : Matières plastiques, Travail des Index. décimale : 668.4 Plastiques, vinyles Résumé : 1. Introduction to compounding / 2. Single-screw compounding / 3. Counterrotating intermeshing twin-screw extruders / 4. The werner and pfleiderer twin-screw corotating extruder system / 5. Corotating intermeshing twin-screw extruder : Berstorff's system / 6. APV (Baker Perkins) system / 7. Intermeshed TEX twin-screw extruder : JSW compounding system / 8. Welding engineer's CRNI twin-screw extruders / 9. Farrel continuous mixer systems for plastics compounding / 10. The recriprocating single-screw extruder and its applicability to compounding / 11. Post-extruder processing Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=52

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