Nanocomposites based on epoxy resin/ graphene nanoplatelets: structure and properties

H. Ribeiro, W. Marcos. Silva, J.C. Neves, M.-T. Rodrigues, R. Paniago, L. Seara, G.G. Silva
Universidade Federal de Minas Gerais, BR

Keywords: graphene, epoxy, triethylenetetramine, glass transition

Summary:

The use of graphene nanoplatelets (GN) as fillers in the preparation of epoxy based composites is the main goal of this work. However, graphene, in their pristine form, is not compatible with organic polymers and does not form homogeneous composites [1,2]. Therefore, the effects of the functionalization process of GN with triethylenetetramine (TETA) were studied in order to improve the nanofiller dispersion on the polymeric matrix. The epoxy resin showed typical values of glass transition temperature (Tg), which are not in the range required for highly demanding applications. However, the inclusion of 1 mass% of GN functionalized with TETA resulted in a >20oC increase in the Tg of the host polymer. The structure and properties of GN and polymer/GN-TETA composite were studied by Raman spectroscopy, thermogravimetric analysis, differential scanning calorimetry, X-ray photoelectron spectroscopy, atomic force microscopy and electron microscopies. The ability of dispersing the graphene nanoplatelets is strongly dependent on the extension of the chemical modification.