Thermal stability, degradation kinetic and electrical properties studies of decorated graphene oxide with CeO<sub>2</sub> nanoparticles-reinforced epoxy coatings
Zeinab Nassaj, Fatemeh Ravarı, I. Danaee, Morteza Ehsani
Abstract
We synthesized decorated graphene oxide with CeO2 nanoparticles (CeO2-GO) hybridusing silane coupling agents, then we dispersed them in the epoxy resin after optimizing it at a weight fraction %1 using differential scanning calorimetry (DSC). The structural and morphological characterization was evaluated using Fourier Transform Infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and X-ray diffraction. The thermal stability of CeO2-GO/Epoxy (CGE) and neat epoxy (NE) were studied by TGA analyses and showed that the CGE system has a good thermal stability and higher char yield comparing to the NE system. The degradation kinetic parameters for CGE matrix were computed by the Vyazovkin’s advanced isoconversional method. The master plots as model fitting was used to estimate the thermal decomposition mechanism, and the results show a good agreement between the experimental data and the F1 theoretical model. We have used electrical impedance spectroscopy (EIS) to evaluate electrical resistance of the CGE system at different percent of (CeO2-GO) nanoparticle. This research highlights that the (CeO2-GO) nanoparticleis a promising candidate for fabrication of anticorrosive coatings.