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Assessment of changes due to accelerated weathering of low - density polyethylene / feather composites / Spiridon Siouris in Industrial & engineering chemistry research, Vol. 51 N° 21 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7279-7286 Titre : Assessment of changes due to accelerated weathering of low - density polyethylene / feather composites Type de document : texte imprimé Auteurs : Spiridon Siouris, Auteur ; Oana Maria Paduraru, Auteur ; Marek Rudowski, Auteur Année de publication : 2012 Article en page(s) : pp. 7279-7286 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Composite  material  Density  Material  weathering  Weathering Résumé : In this study, property changes of controlled aged LDPE/feather composites in comparison to those of nonaged samples were investigated by mechanical tests, dynamic rheological and thermal tests, infrared spectroscopy, and oxygen permeability analysis. The viscoelastic behavior of the aged composites was modified, whereas a pseudoplastic character was observed for the nonaged samples. After weathering, infrared spectroscopy indicated the formation of carbonyl and vinyl groups, and the oxygen permeability became significantly higher than for the reference samples. DSC results showed α-helix denaturation of keratin after aging and an increase in crystallinity due to reinforcement of composites containing feather fibers upon UV exposure. An aging time of 500 h was found to induce surface degradation of composites, especially for a feather fiber loading of 10 wt %. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25948469 [article] Assessment of changes due to accelerated weathering of low - density polyethylene / feather composites [texte imprimé] / Spiridon Siouris, Auteur ; Oana Maria Paduraru, Auteur ; Marek Rudowski, Auteur . - 2012 . - pp. 7279-7286. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7279-7286 Mots-clés : Composite  material  Density  Material  weathering  Weathering Résumé : In this study, property changes of controlled aged LDPE/feather composites in comparison to those of nonaged samples were investigated by mechanical tests, dynamic rheological and thermal tests, infrared spectroscopy, and oxygen permeability analysis. The viscoelastic behavior of the aged composites was modified, whereas a pseudoplastic character was observed for the nonaged samples. After weathering, infrared spectroscopy indicated the formation of carbonyl and vinyl groups, and the oxygen permeability became significantly higher than for the reference samples. DSC results showed α-helix denaturation of keratin after aging and an increase in crystallinity due to reinforcement of composites containing feather fibers upon UV exposure. An aging time of 500 h was found to induce surface degradation of composites, especially for a feather fiber loading of 10 wt %. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25948469