Abstract
Graphene oxide nanoplatelets (GO) were prepared from expanded graphite (EG) and functionalized with triethylenetetramine (GO-TETA). The GO-TETA consisted of a few layers of graphene (~4–6 layers), as determined by atomic force microscopy and Raman spectroscopy. X-ray photoelectron spectroscopy showed that the TETA was covalently linked to the GO in the GO-TETA sample. Epoxy composites based on the diglycidyl ether of bisphenol A with TETA as a hardener and with 0.5–3.0 wt% additions of EG and GO-TETA were investigated. The results showed that the addition of the nanofillers led to an increase of ~20 °C in the glass transition temperature. A slight increase in the ratio of the elastic modulus/hardness of the nanocomposites was observed by nanoindentation tests carried out at a depth range of 300 nm–1.3 μm; these tests indicated a tendency of increased fracture toughness. Microindentation had an enhancement of 40 % in hardness for the 1 wt% composite with GO-TETA relative to the corresponding value for the neat epoxy.
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Acknowledgements
This research was supported by Petrobras. H. Ribeiro is grateful to the Brazilian agency CNPq for financial support. We thank Professor José Rubens G. Carneiro and André Bragança of Mechanical Engineering/PUC-Minas for the microindentation tests. The authors are also thankful to the Instituto Nacional de Ciência e Tecnologia em Nanomateriais de Carbono, Centro de Microscopia/UFMG and Nacional de Grafite Company (Brazil).
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Ribeiro, H., Silva, W.M., Rodrigues, MT.F. et al. Glass transition improvement in epoxy/graphene composites. J Mater Sci 48, 7883–7892 (2013). https://doi.org/10.1007/s10853-013-7478-3
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DOI: https://doi.org/10.1007/s10853-013-7478-3