Wood flour filled polypropylene composites: Interfacial adhesion and micromechanical deformations

Lívia Dányádi, Károly Renner, J. Móczó, B. Pukánszky

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Polypropylene/wood flour composites were prepared in a wide composition range from 0 to 80 wt% filler content. The adhesion of the components was modified by two maleic anhydride functionalized polypropylenes (MAPP) with different maleic anhydride content and molecular weight. The components were homogenized in an internal mixer and then compression molded to 4 mm thick plates. Tensile properties were measured and micromechanical deformation processes were followed by acoustic emission as well as volume strain measurements. The detailed analysis of the results identified four micromechanical deformation processes in the matrix and the composites, respectively. The matrix polymer deforms mainly by shear yielding, which basically does not emit sound. The presence of wood flour initiates particle related processes in the composites. Debonding dominates in the absence of coupling agent. Pull-out of fibers may follow the debonding of large particles at an intermediate stress level. The introduction of functionalized polymer increases interfacial adhesion considerably and completely changes the deformation mechanism; the fracture of wood particles becomes the dominating process in this case. Further improvement of composite strength is possible only by the increase of theiinherent strength of the wood.

Original languageEnglish
Pages (from-to)1246-1255
Number of pages10
JournalPolymer Engineering and Science
Volume47
Issue number8
DOIs
Publication statusPublished - Aug 2007

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Polypropylenes
Wood
Adhesion
Maleic Anhydrides
Debonding
Composite materials
Maleic anhydride
Volume measurement
Strain measurement
Coupling agents
Acoustic emissions
Polymer matrix
Tensile properties
Fillers
Polymers
Molecular weight
Acoustic waves
Fibers
Chemical analysis

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Wood flour filled polypropylene composites : Interfacial adhesion and micromechanical deformations. / Dányádi, Lívia; Renner, Károly; Móczó, J.; Pukánszky, B.

In: Polymer Engineering and Science, Vol. 47, No. 8, 08.2007, p. 1246-1255.

Research output: Contribution to journalArticle

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