Facile Synthesis of a Novel Bio-Based P-N Containing Flame Retardant for Effectively Reducing the Fire Hazards of Epoxy Resin

In this work, a bio-based flame retardant (Cy-HEDP) was synthesized from cytosine and HEDP through facile salt-forming reaction embedded into epoxy matrix to improve the retardancy smoke suppression performance. The product Cy-HEDP well characterized by FTIR, 1 H 31P NMR SEM tests. On basis of results, adding 15 wt% Cy-HEDP, EP15 can pass UL-94 V-0 rating, total production (TSP) as heat release (THR) be decreased 61.05% (from 22.61 8.7 m2 /m2 ) 39.44% 103.19 62.50 MJ/m2 in comparison unfilled EP, reflecting attenuated toxicity impeded generation. According analysis results residual char, it concluded that possessed ability promote formation continuous dense char layers, which would physical barrier insulate oxygen prevent feedback during combustion EP. This work provide inspiration towards developing retardant, probably extending prospects other polymeric material system.