Utilize este identificador para referenciar este registo: http://hdl.handle.net/1822/20853

TítuloUni- and biaxial impact behaviour of double-gated nanoclay-reinforced polypropylene injection mouldings
Autor(es)Pettarin, Valeria
Viau, Gastón
Fasce, L.
Viana, J. C.
Pontes, A. J.
Frontini, P. M.
Pouzada, A. S.
Injection molding
Structure-property relations
Impact resistance
RevistaPolymer Engineering & Science
Resumo(s)Polypopylene/nanoclay three-dimensional parts were produced without intermediate steps by direct injection molding to explore the influence of flow features and nanoclay incorporation in their impact performance. The nanocomposite was obtained by direct compounding of commercial PP with nanoclay masterbatch. The as-molded morphology was analyzed by X-ray and TEM analyses in terms of skin-core structure and nanoclay particle dispersion. The nanoclay particles induced the reduction of β-form spherulites, a known toughener. The impact behavior was assessed in tensile and biaxial modes. The PP nanocomposite molding toughness was practically unaffected by the processing melt temperature and flow rate. Conversely the nanoclay presence is influent in the impact performance. Under biaxial stress impact, the regions close to weld lines are tougher than the bulk and the fracture develops with main crack paths along the flow direction and the weld line. Cracking along the weld line results from less macromolecular interpenetration and chain entanglement, and unfavorable nanoparticle orientation. It seems that a failure mechanism which involves nanoclay delamination and multiple matrix crazing explains the toughening of PP in the directions where the nanoparticle orientation with respect to loading is adequate.
DescriçãoDocumento submetido para revisão pelos pares. A publicar em Polymer Engineering & Science. ISSN 1548-2634.
Arbitragem científicayes
Aparece nas coleções:IPC - Artigos em revistas científicas internacionais com arbitragem

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
2011 Pettarin V accepted.pdfDocumento final4,87 MBAdobe PDFVer/Abrir  Solicitar cópia ao autor!

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu Currículo DeGóis