Abstract
Graphene oxide (GO) was functionalized and reduced simultaneously by a new reductant, 4-hydrazinobenzenesulfonic acid (HBS), with a one-step and environmentally friendly process. The hydrophilic sulfonic acid group in HBS was grafted onto the surface of GO through a covalent bond. The successful preparation of HBS reduced GO (HBS-rGO) was testified by scanning electron microscope (SEM), X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopic (XPS) and thermogravimetric analysis (TGA). The interlayer space of HBS-rGO was increased to 1.478 nm from 0.751 nm for GO, resulting in a subdued Van der Waals’ force between layers and less possibility to form aggregations. The aqueous dispersibility of graphene was improved to 13.49 mg/mL from 0.58 mg/mL after the functionalization. The viscosity of the epoxy resin based HBS-rGO composite could be regulated by an adjustment of the content of HBS-rGO. This study provides a new and applicable approach for the preparation of hydrophilic functionalized graphene, and makes it possible for the application of graphene in some functional polymer nanocomposites, such as specialty water-based coatings.
Highlights
Graphene, a one-atom-thick planar sheet of sp2 -hybridized carbon atoms arranged in a two-dimensional lattice, has drawn more and more attention since being found in 2004, because of its excellent electrical and thermal conductivities, superior mechanical properties, high aspect ratio, remarkable chemical inertness, and impermeability to fluids and gases [1,2]
These properties make graphene a viable candidate for some functional polymer nanocomposites, such as specialty coatings designed to have the characteristics of electromagnetic interference (EMI) shielding and corrosion protection [3,4,5]
Morphology of the graphene oxide (GO) and hydrazinobenzenesulfonic acid (HBS)-rGO samples are characterized by scanning electron microscope (SEM)
Summary
A one-atom-thick planar sheet of sp2 -hybridized carbon atoms arranged in a two-dimensional lattice, has drawn more and more attention since being found in 2004, because of its excellent electrical and thermal conductivities, superior mechanical properties, high aspect ratio, remarkable chemical inertness, and impermeability to fluids and gases [1,2] These properties make graphene a viable candidate for some functional polymer nanocomposites, such as specialty coatings designed to have the characteristics of electromagnetic interference (EMI) shielding and corrosion protection [3,4,5]. Nanocomposites were prepared and their viscosity behavior was verified This study makes it possible to compound graphene with the hydrophilic matrix, and has broad application prospects in specialty water-based coatings
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