二茂铁对DOPO/环氧树脂体系燃烧性能及固化反应动力学的影响

Effect of Ferrocene on the Combustion Performance and Curing Kinetics of DOPO/Epoxy System

为研究二茂铁对磷杂菲(DOPO)/环氧树脂(EP)体系燃烧性能及固化反应动力学的影响,将不同比例的二茂铁与DOPO/EP体系复配制备了阻燃EP复合材料,通过氧指数(LOI)测试、UL94垂直燃烧测试、烟密度测试和热重分析研究了阻燃EP复合材料的燃烧性能和热氧稳定性,并通过非等温DSC法研究了二茂铁对DOPO/EP体系固化反应动力学的影响。结果表明,二茂铁和DOPO在阻燃EP复合材料中表现出明显的阻燃协效作用,添加了二茂铁的阻燃EP复合材料的LOI最高可达34.8%,烟密度等级(SDR)最低降至71.43。热重分析表明,二茂铁会降低阻燃EP复合材料的热氧稳定性,但是可以显著增加热解残炭量。固化反应动力学研究结果表明,二茂铁的添加使阻燃EP体系固化反应的活化能E a和指前因子A均减小。研究工作可以为高性能阻燃EP复合材料的开发提供参考。

In order to study the effect of ferrocene on the combustion performance and curing kinetics of phosphaphenanthrene(DOPO)/epoxy resin(EP)system,the flame-retardant EP composites were prepared by mixing different proportion of ferrocene with DOPO/EP system.The combustion performance and thermal oxygen stability of the EP composites were studied by oxygen index test(LOI),UL94 vertical combustion test,smoke density test and thermogravimetric analysis(TGA).The effect of ferrocene on the curing kinetics of DOPO/EP system was studied by non-isothermal differential scanning calorimetry(DSC).The results show that ferrocene and DOPO have obvious synergistic effect on flame-retardant EP composites.The maximum LOI of the EP composites with ferrocene could achieve 34.8%,and the minimum smoke density decreases to 71.43.TGA results show that ferrocene can reduce the thermal oxygen stability of the flame-retardant EP composites,however,it can significantly increase the amount of residue char.The curing kinetics results show that the addition of ferrocene can reduce the activation energies and pre-exponential factors of the curing reaction.This research may provide reference for the development of high performance flame-retardant EP composites.