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TitleUni- and biaxial impact behaviour of double-gated nanoclay-reinforced polypropylene injection mouldings
Author(s)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
Issue date2013
JournalPolymer Engineering & Science
Abstract(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.
DescriptionDocumento submetido para revisão pelos pares. A publicar em Polymer Engineering & Science. ISSN 1548-2634.
AccessRestricted access (UMinho)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

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