title: Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide.
abstract: Exfoliation of expanded GO represents an attractive route to functionalized graphenes as versatile 2D carbon nanomaterials and components of a wide variety of polymer nanocomposites. Thermally reduced graphite oxides (TrGO) with specific surface areas of 600 to 950 m(2)  · g(-1) were obtained by oxidation of graphite followed by thermal expansion at 600 °C. Thermal post treatment at 700 °C and 1 000 °C increased carbon content (81 to 97 wt.-%) and lowered resistivity (1 600 to 50 Ω · cm). During melt extrusion with PC, iPP, SAN and PA6, exfoliation afforded uniformly dispersed graphenes with aspect ratio > 200. In comparison to conventional 0D and 1D carbon nanoparticles, TrGO afforded nanocomposites with improved stiffness and lower percolation threshold. Recent progress and new strategies in development of functionalized graphenes and graphene-based nanocomposites are highlighted.
authors.affiliation: Freiburger Materialforschungszentrum and Institut für Makromolekulare Chemie of the Albert-Ludwigs-University Freiburg, Stefan-Meier-Strasse 31, D-79104 Freiburg, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Steurer
authors.forename: Rainer
authors.initials: R
authors.lastname: Wissert
authors.forename: Ralf
authors.initials: R
authors.lastname: Thomann
authors.forename: Rolf
authors.initials: R
authors.lastname: Mülhaupt