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Functionalization and Dispersion of Carbon Nanomaterials Using an Environmentally Friendly Ultrasonicated Ozonolysis Process
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Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide.

Peter Steurer1, Rainer Wissert, Ralf Thomann

  • 1Freiburger Materialforschungszentrum and Institut für Makromolekulare Chemie of the Albert-Ludwigs-University Freiburg, Stefan-Meier-Strasse 31, D-79104 Freiburg, Germany.

Macromolecular Rapid Communications
|June 28, 2011
PubMed
Summary

This study introduces thermally reduced graphite oxides (TrGO) as functionalized graphene nanomaterials for polymer composites. TrGO enhances material stiffness and lowers the percolation threshold, offering superior performance over traditional carbon nanoparticles.

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Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies

Published on: November 5, 2015

Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Graphene and its derivatives are versatile 2D carbon nanomaterials.
  • Functionalized graphenes are key components in advanced polymer nanocomposites.
  • Exfoliation of graphite oxide (GO) is a primary method for graphene production.

Purpose of the Study:

  • To develop functionalized graphenes via exfoliation of expanded graphite oxide.
  • To investigate the properties of thermally reduced graphite oxides (TrGO).
  • To evaluate TrGO as a reinforcing agent in polymer nanocomposites.

Main Methods:

  • Graphite oxidation followed by thermal expansion at 600°C to obtain TrGO.
  • Post-treatment of TrGO at 700°C and 1000°C to optimize carbon content and resistivity.
  • Melt extrusion of TrGO with polycarbonate (PC), iPP, SAN, and PA6.

Main Results:

  • TrGO exhibited high specific surface areas (600-950 m²/g).
  • Post-treatment increased carbon content to 97 wt.% and reduced resistivity to 50 Ω·cm.
  • Uniform graphene dispersion (aspect ratio >200) was achieved in polymer matrices.
  • TrGO-based nanocomposites showed improved stiffness and lower percolation thresholds compared to 0D/1D carbon fillers.

Conclusions:

  • Exfoliated TrGO serves as an effective 2D nanomaterial for polymer nanocomposites.
  • TrGO offers enhanced mechanical properties and efficient electrical conductivity pathways.
  • This approach presents a viable strategy for developing high-performance graphene-based nanocomposites.