Modification of interfacial adhesion with a functionalized polymer in PLA/wood composites

Áron Csikós, Gábor Faludi, Attila Domján, Károly Renner, J. Móczó, B. Pukánszky

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Maleic anhydride (MA) grafted poly(lactic acid) (PLA) coupling agents (MAPLA) were prepared by reactive processing. The amount of peroxide initiator and MA was varied over a relatively wide range. Coupling efficiency was checked in PLA/wood composites as a function of grafting degree, coupling agent and wood content. The analysis of the results showed that chain scission takes place in PLA during reactive modification. The occurrence of grafting could not be proved by FTIR spectroscopy, but a detailed NMR analysis showed that the degree of grafting depends on the amount of both reactants; a maximum of 2.5 MA groups/PLA chain could be grafted under the conditions used in the study. The functionalized polymer proved to be an efficient coupling agent in PLA/wood composites. Efficiency increased with increasing number of functionality and coupling agent amount. Coupling resulted in increased strength and reinforcement. Acoustic emission analysis of deformation processes supported by microscopy proved that the dominating local deformation process is the fracture of the fibers, but a small extent of debonding also occurs in neat, uncoupled composites. The prevention of debonding by coupling resulted in the improved performance of the composites. Local processes initiate the immediate failure of the composite irrespectively of their mechanism.

Original languageEnglish
Pages (from-to)592-600
Number of pages9
JournalEuropean Polymer Journal
Volume68
DOIs
Publication statusPublished - Jul 1 2015

Fingerprint

lactic acid
Lactic acid
Coupling agents
Maleic Anhydrides
Wood
Polymers
adhesion
Adhesion
Maleic anhydride
composite materials
Composite materials
polymers
anhydrides
Debonding
Peroxides
Acoustic emissions
Reinforcement
Microscopic examination
acoustic emission
peroxides

Keywords

  • Coupling
  • Failure mechanism
  • Local deformations
  • Maleated PLA
  • Poly(lactic acid) (PLA)
  • Wood reinforcement

ASJC Scopus subject areas

  • Polymers and Plastics
  • Physics and Astronomy(all)
  • Organic Chemistry

Cite this

Modification of interfacial adhesion with a functionalized polymer in PLA/wood composites. / Csikós, Áron; Faludi, Gábor; Domján, Attila; Renner, Károly; Móczó, J.; Pukánszky, B.

In: European Polymer Journal, Vol. 68, 01.07.2015, p. 592-600.

Research output: Contribution to journalArticle

Csikós, Áron ; Faludi, Gábor ; Domján, Attila ; Renner, Károly ; Móczó, J. ; Pukánszky, B. / Modification of interfacial adhesion with a functionalized polymer in PLA/wood composites. In: European Polymer Journal. 2015 ; Vol. 68. pp. 592-600.
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