Superior flame retardancy of epoxy resin by the combined addition of graphene nanosheets and DOPO
writer：Liu S, Fang ZP*, Yan HQ, Chevali VS, Wang H
keywords：Graphene nanosheets, DOPO, Epoxy resin, Flame retardancy, Thermal properties
source：期刊
specific source：RSC Advances, 2016.1, 6, 5288-5295
Issue time：2016年
In this paper, the thermal stability and fire retardant behavior of epoxy resin (ER) composites filled with graphene nanosheets (GNS) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) were investigated. Addition of GNS and DOPO changed the decomposition pathway of ER. During combustion, DOPO played a key flame retardancy role in the gas phase and the char enhancement in the condensed phase, while GNS played an effect in the condensed phase. Addition of 5 wt% GNS and DOPO separated, the peak heat release rate (PHRR) of ER was reduced from 1194 kW/m2 to 513.9 kW/m2 and 937.1 kW/m2, respectively. With the combined addition of GNS and DOPO, the flame retardancy of ER composites was significantly improved. The PHRR was reduced to 396 kW/m2 at the addition of 2.5% GNS and 2.5% DOPO. The same tendency was obtained for the total heat release (THR), showing a synergistic effect between GNS and DOPO in improving the flame retardancy of ER composites. The combined addition of GNS and DOPO into ER enhanced the formation of a more compact and highly thermal stable char.