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Effects of sparse long chain branching on the spinning stability of LLDPEs / M. J. Bortner in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 3 (09/2004)
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Titre : Effects of sparse long chain branching on the spinning stability of LLDPEs Type de document : texte imprimé Auteurs : M. J. Bortner, Auteur ; P. J. Doerpinghaus, Auteur ; D. G. Baird, Auteur Année de publication : 2004 Article en page(s) : p. 236-243 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Polymérisation 'Modèle mathématique' 'Réaction cinétique' 'Contrôle du process' Index. décimale : 668.9 Polymères Résumé : The influence of sparse long chain branching on the onset and propagation of isothermal draw resonance in fiber spinning of polyethylene melts was investigated. Six polyethylene melts were used in this study: three sparsely branched metallocene polyethylenes, a linear low-density metallocene polyethylene, a conventional linear low-density polyethylene, and a conventional low-density polyethylene (LDPE). The sparsely branched metallocene polyethylenes have almost identical shear rheology and molecular weight distributions, but strain harden to different extents under extensional deformation because of slight differences in the amount of sparse long chain branching. Critical draw ratios and the ratios of minimum to maximum diameter were found to be different for each of these polyethylenes. The two linear low-density polyethylenes, which have no long chain branching, had critical draw ratios similar to those of the sparsely branched polyethylenes, but failed (necked to the point of filament breakage) during monofilament extrusion at draw ratios significantly lower than those measured for the sparsely branched polyethylenes. In contrast, the LDPE, which has the highest degree of branching and largest molecular weight distribution, had a much higher critical draw ratio than that obtained for the other five polyethylenes. These results suggest that the degree of extensional strain hardening, arising from differences in long chain branching, has a significant effect on the onset and propagation of draw resonance in isothermal fiber spinning. In the case of LLDPE, broadening the MWD seemed to affect the drawability of LLDPE, but had no effect on the critical draw ratio. DOI : 10.3139/217.1824 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3105
in INTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 3 (09/2004) . - p. 236-243[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001029 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Seen in the right light Type de document : texte imprimé Auteurs : Philipp Kolb, Auteur ; Rolf-Uwe Müller, Auteur Année de publication : 2010 Article en page(s) : p. 22-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Tags : Plastiques Optique 'Moulage par injection' 'In-Mold labelling process' 'IML reflector' 'Systèmes d'éclairages' 'Surface réfléchissante' Index. décimale : 668.4 Plastiques, vinyles Résumé : Optics - Development engineers from two cooperation partners are currently working on replacing the PVD coating that is often used to create reflective surfaces by back-molding of metallized films. This work is being carried out as part of a research project whose objective is the resource-conserving production of energyefficient lighting systems. En ligne : https://drive.google.com/file/d/1wbq2WrtEoqbPm7luQk21r8h7leXGNpFe/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9885
in KUNSTSTOFFE INTERNATIONAL > Vol. 100, N° 7 (07/2010) . - p. 22-25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012385 - Périodique Bibliothèque principale Documentaires Disponible