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A biobased reactive phosphate flame retardant derived from isoeugenol was synthesized and fully characterized (1H, 13C, 31P NMR, FTIR, MS) with the aim of improving flame retardancy behavior of biobased epoxy thermosets. This new green flame retardant, diepoxy-isoeugenol phenylphosphate (DEpiEPP), was then copolymerized either with conventional diglycidyl ether of bisphenol A resin (DGEBA) or with a totally biobased glycidyl ether epoxy isoeugenol (GEEpiE) resin using a biobased camphoric anhydride (CA) as hardener. Resulting thermosets with varying rates of flame retardant (1.0 to 4.3 wt % phosphorus) were then characterized (FTIR, DSC, nanoindentation, three-point bending test, TGA, PCFC, cone calorimeter). In this way, a new solution was proposed allowing (i) to increase the biobased content of thermosets, (ii) to improve the flame retardancy properties by a reactive way, and (iii) to provide epoxy thermosets with high Tg, excellent mechanical properties, and a curing temperature compatible with the us...

New Reactive Isoeugenol Based Phosphate Flame Retardant: Toward Green Epoxy Resins