How Phosphorous Flame Retardant Additives Affect Benzoxazine‐Based Monomer and Polymer Properties

The phosphorous-based flame retardant additives poly(m-phenylene methylphosphonate) (PMP) and resorcinol bis(diphenyl phosphate) (RDP) are reacted with bisphenol F aniline–based benzoxazine (BF-a). DSC, rheological analysis, FT-IR, soxhlet extraction reveal the covalent incorporation of both FR additives—initiating phenols in PMP structure as well free generated via transesterification reaction case RDP. In contrast to PMP, RDP elongates processing window but decreases thermo–mechanical properties. Both increase resistance reactions against small flames solely a phosphorous loading 0.3 wt%, resulting V-0 rating an improvement OI value by up 2% for 4% PMP. FRs reduce heat release rate smoke production toxicity