Abstract
In order to effectively improve the flame retardancy of epoxy resin (EP), a novel graphene oxide-cobalt nickel phosphate (GO-NiCoPO3) is successfully synthesized. GO-NiCoPO3 nanoplates are incorporated into EP matrix for preparing EP/GO-NiCoPO3 nanocomposites. The results show that the LOI value of EP/4GO-NiCoPO3 nanocomposites is as high as 30.3%, and UL-94 can reach V-1 rating. The results of micro-combustion calorimeter (MCC) indicate that the THR and PHRR values of EP/8GO-NiCoPO3 nanocomposites are decreased by 41.9% and 23.8% compared with pure EP. This is mainly due to the synergistic barrier effect of GO and NiCoPO3, which together play their own advantages. Meanwhile, EP/GO-NiCoPO3 nanocomposites can form a dense char layer during the burning process, and improve the thermal stability of EP/GO-NiCoPO3 nanocomposites.
Highlights
Epoxy resin (EP) is well known for its excellent mechanical and chemical properties and has been used in various fields such as electronics and insulating materials. (Kong et al, 2017a; Li et al, 2018; Xu et al, 2019; Ding et al, 2020; Nie et al, 2020)
The Fourier transform infrared spectra (FTIR) spectra of NiCoPO3 and graphene oxide (GO)-NiCoPO3 are shown in Figure 1D, and the FTIR legend of GO is embedded in the inset
The TG results showed that the addition of GO-NiCoPO3 promoted char formation and enhanced the thermal stability of the polymer at high temperatures
Summary
Epoxy resin (EP) is well known for its excellent mechanical and chemical properties and has been used in various fields such as electronics and insulating materials. (Kong et al, 2017a; Li et al, 2018; Xu et al, 2019; Ding et al, 2020; Nie et al, 2020). When 10 wt% DOPO-rGO was added, the char yield and limiting oxygen index (LOI) value were increased by 81 and 30%, respectively, and obviously improved the flame retardancy of the EP (Liao et al, 2012). LOI, limiting oxygen index; EP, epoxy resin; Go, graphene oxide; NiCoPO3, cobalt nickel phosphate.
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