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Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide
Author(s) -
Steurer Peter,
Wissert Rainer,
Thomann Ralf,
Mülhaupt Rolf
Publication year - 2009
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200800754
Subject(s) - materials science , nanocomposite , graphene , graphite , exfoliation joint , oxide , percolation threshold , graphite oxide , carbon fibers , composite material , nanomaterials , polymer , nanotechnology , composite number , electrical resistivity and conductivity , engineering , electrical engineering , metallurgy
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.