Influence of surface modified graphene oxide on the mechanical performance and curing kinetics of epoxy resin

In this study, the hyperbranched polyester were successfully grafted onto graphene oxide (GO). The mechanical performance and curing kinetics of epoxy resin (EP), EP/ graphene oxide (EP/GO), and EP/ hyperbranched polyester grafted GO (EP/GO-B) were investigated by means of mechanical tests and differential scanning calorimetry (DSC). Results revealed that the presence of GO lowered the cure temperature and accelerated the curing of EP, and the addition of GO-B exhibited a stronger effect in accelerating the cure of EP compared with GO. Activation energies were calculated using Kissinge r approach, and Ozawa approach, respectively. Results revealed lowered activation energy after the addition of GO or GO-B at low degrees of cure, indicating that GO had a large effect on the curing reaction. The presence of GO facilitated the curing reaction, especially the initial epoxy-amine reaction. Moreover, GO-B exhibited better performance. Related mechanism was proposed.