TGA. Thermogravimetric Analysis (TGA) was carried out using a Mettler Toledo TGA/DSC 1, under a N2 atmosphere between 30 -600 °C with a 10 K min ramp. Samples were prepared by grinding down to a powder and weighing out 10 mg for analysis. The residual mass of GNP was found by subtracting the mass at 600 °C for the neat epoxy sample from the nanocomposite samples.