Simulation of interphase percolation and gradients in polymer nanocomposites

Rui Qiao, L Catherine Brinson*

*Corresponding author for this work

Research output: Contribution to journalArticle

170 Scopus citations

Abstract

Experimental data suggests that well dispersed nanoparticles within a polymer matrix induce a significant interphase zone of altered polymer mobility surrounding each nanoparticle, which can lead to a percolating interphase network inside of the composite. To investigate this concept and the nature of the interphase, a two-dimensional finite element model is developed to study the impact of interphase zones on the overall properties of the composite. Thirty non-overlapping identical circular inclusions are randomly distributed in the matrix with layers of interphase surrounding the inclusions. The simulation results clearly show that the loss moduli of composites are either broadened or shifted corresponding to the absence or presence of a geometrically percolating interphase network. Our numerical study correlates well with experimental data showing broadening of loss peaks for unfunctionalized composites and a large shift of the loss modulus for functionalized nanotube polymer composites. Further, our results indicate the existence of a gradient in properties of the interphase layer and that incorporating this gradient into modeling is critical to reflect the behavior of polymer nanocomposites.

Original languageEnglish (US)
Pages (from-to)491-499
Number of pages9
JournalComposites Science and Technology
Volume69
Issue number3-4
DOIs
StatePublished - Mar 1 2009

Keywords

  • A. Nanocomposites
  • A. Polymer-matrix composites (PMCs)
  • B. Interphase
  • C. Finite element analysis
  • Interphase percolation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering(all)

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