Synthesis And Structure-function Relationship Study Of Novel Alkylphosphinate Flame Retardants

In this study, BMP was used as material to synthesize seven kinds of methylcyclohexylphosphinic salts （Al/Zn/Mg/Ca/Fe（III）/Fe（II）/Bi） flame retardant by three simple steps. Thesynthesis process and structures of the products were characterized by GC、FTIR、XRF、H-NMR and P-NMR. When these seven kinds of flame retardant applied to EP, Al（MHP）was the most effective, Al（MHP）/EP composites could pass UL94V-0rating with the LOI of28.7%by adding15wt.%Al（MHP）. The composites had excellent thermal stability and glasstransition temperature, their mechanical properties had declined slightly but no effect onapplication, compared with neat EP, all composites had lower moisture absorption, which isvery important for E&E applications. SEM and EDX analysis of combustion productsshowed that Al（MHP） had flame retardant mechanism both in gas phase and condensedphase. When Al（MHP） used in PBT and PLA, the composites could also achieve good flameretardancy, with the addition of a little bit of MC, the flame retardancy of composites hadslightly improved because of the P-N synergistic. Moreover, the decomposition process andmechanism for neat EP material and15wt.%Al（MHP）/EP composite was explored throughthe research of thermal decomposition kinetics, their activation energy were155.23KJ/moland199.76KJ/mol, the kinetic equation could be respectively expressed as g（α）’=[-ln（1-α）]^2/3and g（α）”=[（1-α）^-1/3-1]².