Multifunctional elastomer nanocomposites with functionalized graphene single sheets

Bulent Ozbas, Christopher D. O'Neill, Richard Alan Register, Ilhan A. Aksay, Robert Krafft Prud'homme, Douglas H. Adamson

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

We demonstrate the use of functionalized graphene sheets (FGSs) as multifunctional nanofillers to improve mechanical properties, lower gas permeability, and impart electrical conductivity for several distinct elastomers. FGS consists mainly of single sheets of crumbled graphene containing oxygen functional groups and is produced by the thermal exfoliation of oxidized graphite (GO). The present investigation includes composites of FGS and three elastomers: natural rubber (NR), styrene-butadiene rubber, and polydimethylsiloxane (PDMS). All of these elastomers show similar and significant improvements in mechanical properties with FGS, indicating that the mechanism of property improvement is inherent to the FGS and not simply a function of chemical crosslinking. The decrease in gas permeability is attributed to the high aspect ratio of the FGS sheets. This creates a tortuous path mechanism of gas diffusion; fitting the permeability data to the Nielsen model yields an aspect ratio of ∼1000 for the FGS. Electrical conductivity is demonstrated at FGS loadings as low as 0.08% in PDMS and reaches 0.3 S/m at 4 wt % loading in NR. This combination of functionalities imparted by FGS is shown to result from its high aspect ratio and carbon-based structure.

Original languageEnglish (US)
Pages (from-to)910-916
Number of pages7
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume50
Issue number13
DOIs
StatePublished - Jul 1 2012

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Keywords

  • elastomer
  • filler
  • graphene
  • multifunctional
  • nanocomposite

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