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Analysis of shrinkage development of a semicrystalline polymer during injection molding / Santis De Felice in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2469–2476 Titre : Analysis of shrinkage development of a semicrystalline polymer during injection molding Type de document : texte imprimé Auteurs : Santis De Felice, Auteur ; Roberto Pantani, Auteur ; Vito Speranza, Auteur Année de publication : 2010 Article en page(s) : pp. 2469–2476 Note générale : Idustrial Chemistry Langues : Anglais (eng) Mots-clés : Polymers;  Semicrystalline Résumé : The phenomenon of shrinkage in injection molding is particularly relevant for the processing of semicrystalline polymers. Nevertheless, if compared with the considerable effort spent by researchers to investigate the evolution of shrinkage and thermal stresses in amorphous polymers, the research work devoted to shrinkage of semicrystalline polymers is rather limited in the literature. In this work, the influence of holding pressure and time, and geometric constraints, on the shrinkage of a semicrystalline polymer was explored. Adopting a technique based on strain gauges, the time at which shrinkage started inside the mold was measured as a function of the holding pressure. Experimental results were compared with predictions for shrinkage obtained by a code developed at the University of Salerno, which takes into account crystallization kinetics and the effect of crystallinity on material properties. In particular, a solidification criterion based on the degree of crystallinity was identified Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901316p [article] Analysis of shrinkage development of a semicrystalline polymer during injection molding [texte imprimé] / Santis De Felice, Auteur ; Roberto Pantani, Auteur ; Vito Speranza, Auteur . - 2010 . - pp. 2469–2476. Idustrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2469–2476 Mots-clés : Polymers;  Semicrystalline Résumé : The phenomenon of shrinkage in injection molding is particularly relevant for the processing of semicrystalline polymers. Nevertheless, if compared with the considerable effort spent by researchers to investigate the evolution of shrinkage and thermal stresses in amorphous polymers, the research work devoted to shrinkage of semicrystalline polymers is rather limited in the literature. In this work, the influence of holding pressure and time, and geometric constraints, on the shrinkage of a semicrystalline polymer was explored. Adopting a technique based on strain gauges, the time at which shrinkage started inside the mold was measured as a function of the holding pressure. Experimental results were compared with predictions for shrinkage obtained by a code developed at the University of Salerno, which takes into account crystallization kinetics and the effect of crystallinity on material properties. In particular, a solidification criterion based on the degree of crystallinity was identified Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901316p