Hydrolytic depolymerization of polyethylene terephthalate by reactive extrusion / T. Yalçinyuva in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 2 (06/2000) . - p. 137-146 Titre : Hydrolytic depolymerization of polyethylene terephthalate by reactive extrusion Type de document : texte imprimé Auteurs : T. Yalçinyuva, Auteur ; Musa R. Kamal, Auteur ; R. A. Lai-Fook, Auteur ; S. Özgümüs, Auteur Année de publication : 2000 Article en page(s) : p. 137-146 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Continuous hydrolytic depolymerization of polyethylene terephthalate (PET) resin at high temperature and pressure was carried out in a co-rotating twin screw extruder. In this novel process, hydrolysis is achieved by injection of saturated steam at high pressure. Optimum conditions occur at relatively low screw speeds and water/PET ratios. Hydrolysis extent was measured using carboxyl end group titration, and by determination of molecular weights using NMR and GPC analysis. Low molecular weight products are obtained at low residence times in the extruder, suggesting high depolymerization rates. This is supported by the results of a simple kinetic model. Note de contenu : - HYDROLYSIS MECHANISM AND KINETICS - EXPERIMENTAL WORK : Materials - Extend of hydrolysis and molecular weight - Extrusion and auxiliary equipment - Experimental procedures - RESULTS AND DISCUSSION : Reaction extent - Hydrolysis kinetics - Process characteristics DOI : 10.3139/217.1587 En ligne : https://drive.google.com/file/d/1wkZz83aKyHCR0CiMecJXwXKn6BVkhwes/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16052 [article]

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Measurement and prediction of temperature distribution in an injection molding cavity / F. Manero in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 2 (06/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 2 (06/2003) . - p. 185-193 Titre : Measurement and prediction of temperature distribution in an injection molding cavity Type de document : texte imprimé Auteurs : F. Manero, Auteur ; Musa R. Kamal, Auteur ; R. A. Lai-Fook ; A. E. varela ; W. I. Patterson Année de publication : 2003 Article en page(s) : p. 185-193 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A method to measure the melt temperature distribution in an injection mold cavity is developed. A thermocouple is used in the construction of a sensor with a tip that can be adjusted at different depths of a mold cavity, to measure temperature profiles at different positions in the mold. Polymer temperature distributions are measured and factors affecting temperatures and the key variables that influence distributions are determined. Measurements are compared with temperatures obtained from numerical simulation of the injection molding process using a three-dimensional heat transfer analysis. Although showing lower values and generally higher cooling rates, temperature data measured from the mold cavity indicate similar behavior to predicted transient temperature distributions. DOI : 10.3139/217.1728 En ligne : https://drive.google.com/file/d/1PTG594L-TK_GNJU2gSDm7WXx2vxhas2M/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3310 [article]

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