(4-氟苄基)二苯基氧化膦阻燃改性环氧树脂的研究

Study on flame retardant modification of epoxy resin by(4-fluorobenzyl)diphenylphosphine oxide

通过二苯基氧膦(DPO)与4-氟氯苄反应制备了(4-氟苄基)二苯基氧化膦(4-FDPO)。以4-FDPO为阻燃剂、4,4′-二氨基二苯砜(DDS)为固化剂制备了双酚A型阻燃环氧树脂(EP)。考察了阻燃剂对EP的阻燃性能、介电性能、热稳定性能和吸水性能的影响。结果表明,样品EP/4-FDPO-0.9(磷质量分数为0.9%的4-FDPO改性EP)的LOI为34.3%,并在垂直燃烧测试中达到V-0等级。与纯EP相比,EP/4-FDPO-0.9的热释放速率峰值、平均热释放速率和平均有效燃烧热分别降低了49.6%、9.7%和17.7%。阻燃机理研究表明,4-FDPO的引入除明显提高了EP的阻燃性能外,在0.1 MHz-15 MHz频率范围内还具有更低的介电常数(Dk)和介电损耗(Df)值,有利于改善EP的介电性能。

(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.