Micromechanical deformations in PP/lignocellulosic filler composites: Effect of matrix properties

Károly Renner, János Móczó, Péter Suba, Béla Pukánszky

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Polypropylene composites were prepared from three different PP matrices, a homopolymer, a random and a heterophase copolymer, and corn cob to study the effect of matrix characteristics on deformation and failure. The components were homogenized in an internal mixer and compression molded to 1 mm thick plates. Mechanical properties were characterized by tensile testing, while micromechanical deformations by acoustic emission measurements and fractography. The results proved that the dominating micromechanical deformation process may change with matrix properties. Yield stress determined from the stress vs. strain traces may cover widely differing processes. Debonding is the dominating process when the adhesion of the components is poor, while matrix yielding and/or filler fracture dominate when adhesion is improved by the introduction of a functionalized polymer. The dominating deformation mechanism is determined by component properties and adhesion. Interfacial adhesion, matrix yield stress and the inherent strength of the reinforcement can be limiting factors in the improvement of composite strength. The properties of polymer composites reinforced with lignocellulosic fillers are determined by micromechanical deformation processes, but they are independent of the mechanism of these processes.

Original languageEnglish
Pages (from-to)1141-1147
Number of pages7
JournalComposites Science and Technology
Volume70
Issue number7
DOIs
Publication statusPublished - Jul 1 2010

Keywords

  • A. Particle-reinforced composites
  • B. Debonding
  • B. Fracture
  • B. Mechanical properties
  • Micromechanical deformations

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering(all)

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