(4-Fluorobenzyl)diphenylphosphine oxide(4-FDPO)is prepared through the reaction between diphenylphosphine oxide(DPO)and 4-fluorochlorobenzyl.Flame retardant bisphenol A-type epoxy resin(EP)is prepared by using 4-FDPO as the flame retardant and 4,4′-diaminodiphenylsulfone(DDS)as the curing agent.The influences of flame retardant on the flame retardancy,dielectric property,thermal stability,and water absorption performance of EP are investigated.It is shown that the sample EP/4-FDPO 0.9(4-FDPO modified EP with a phosphorus mass fraction of 0.9%)has a LOI of 34.3%and reaches the V-0 level in vertical combustion testing.The peak heat release rate,average heat release rate,and average effective combustion heat of EP/4-FDPO-0.9 are 49.6%,9.7%,and 17.7%,respectively lower than those of pure EP.It is indicated through flame retardant mechanism study that the addition of 4-FDPO significantly improves the flame retardant performance of EP,and also delivers lower dielectric constant and dielectric loss values in the frequency range of 0.1 MHz-15 MHz,which is beneficial for improving the dielectric performance of EP.
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