Abstract
A novel compound (DOPO-V-PA) containing phosphorus and silicon elements was grafted onto the surface of graphene oxide (GO) to obtain a graphene-based flame retardant (GO–DOPO-V-PA). The structure of GO-DOPO-V-PA was characterized and confirmed by FTIR and XPS spectra. AFM measurements showed that the average height of GO-DOPO-V-PA was thicker than that of GO and that the surface of GO-DOPO-V-PA was not uniform, contrary to the surface of the initiator GO before modification. The thermal stability of GO-DOPO-V-PA was greatly improved by the functionalization of GO with DOPO-V-PA, and the residual char of GO-DOPO-V-PA at 600°C increased from 16.45 (GO) to 61.44 wt %. After GO-DOPO-V-PA was incorporated into epoxy resin (EP), the residual char of EP/GO-DOPO-V-PA was almost 3 wt % higher than that of pure EP and EP/GO. Furthermore, EP/GO-DOPO-V-PA exhibited excellent flame retardancy. Compared to the pure EP and EP/GO, the peak heat release rate (pHRR) and total heat release (THR) of EP/GO-DOPO-V-PA both decreased, which was probably caused by the higher residual char of EP/GO-DOPO-V-PA during combustion. Thus, the flame retardancy of the graphene-based composites was improved with the addition of 2 wt % GO-DOPO-V-PA, which was much less than the previously known flame retardant systems, and the graphene has been demonstrated its excellent performance in the fire safety of the polymer materials.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call