Origin of dynamical properties in PMMA-C 60 nanocomposites

Jamie M. Kropka, Karl W. Putz, Victor Pryamitsyn, Venkat Ganesan, Peter F. Green*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

Poly(methyl methacrylate) (PMMA)-C 60 nanocomposites, with compositions in the range 0 ≤ φ C60 wt ≤ 0.05, are shown to exhibit systematic increases in dynamic shear moduli, in glass transition temperature (T g), and in the longest relaxation time of the polymer (τ R) with increasing fullerene concentration. We show that while the φ C60 wt dependence of the plateau modulus can be reconciled with a conventional "filler" effect, the systematic increases in T g and in τ R are associated with specific interactions between the C 60 and the polymer segments. In the melt, these segment-C 60 interactions are proposed to reduce polymer segmental mobility in the vicinity of the particle surface and ultimately suppress polymer dynamics, as measured mechanically, in a manner consistent with an increase in the polymer segmental friction coefficient.

Original languageEnglish (US)
Pages (from-to)5424-5432
Number of pages9
JournalMacromolecules
Volume40
Issue number15
DOIs
StatePublished - Jul 24 2007

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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