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首页> 外文期刊>RSC Advances >Flame-retardant effect of a phenethyl-bridged DOPO derivative and layered double hydroxides for epoxy resin
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Flame-retardant effect of a phenethyl-bridged DOPO derivative and layered double hydroxides for epoxy resin

机译：苯乙基桥接的DOPO衍生物和层状双氢氧化物对环氧树脂的阻燃作用

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Flame-retardant epoxy resin (EP) composites were prepared by the incorporation of a phenethyl-bridged DOPO derivative (DiDOPO) and modified layered double hydroxide (OLDH). In addition, the flame-retardant behaviour, thermal stability, synergism between DiDOPO and OLDH, and mechanical properties of the flame-retardant EP composites were examined. The introduction of a specific amount of OLDH in the intumescent flame-retardant EP led to considerable enhancement in flame retardancy, thermal stability, and mechanical properties. Furthermore, the effects of DiDOPO and OLDH on the flame-retardant properties of the EP composites were characterised by the limiting oxygen index (LOI) as well as the UL-94 vertical burning and cone calorimeter tests (CCT). The LOI of the EP/DiDOPO5/OLDH5 composites increased from 21.8% to 31.5%, and the composites exhibited the V-0 rating in the UL-94 vertical burning test. Moreover, the EP/DiDOPO5/OLDH5 composite exhibited the highest tensile strength and a low peak heat release rate and the total heat release values. In addition, scanning electron microscopy observation revealed a considerably more continuous, compact char residue for the EP/DiDOPO/OLDH composite. Thermogravimetric analysis and CCT revealed that DiDOPO and OLDHs exert gas- and condensed-phase flame-retardant effects. Overall, different flame retardant performance is related to the characteristics of each composite; dispersion state in the EP matrix; and structural changes during burning.
机译：阻燃环氧树脂（EP）复合材料是通过结合苯乙基桥接的DOPO衍生物（DiDOPO）和改性的层状双氢氧化物（OLDH）来制备的。此外，还检查了阻燃性能，热稳定性，DiDOPO和OLDH之间的协同作用以及阻燃EP复合材料的机械性能。在膨胀型阻燃EP中引入一定量的OLDH导致阻燃性，热稳定性和机械性能大大提高。此外，DiDOPO和OLDH对EP复合材料阻燃性能的影响通过极限氧指数（LOI）以及UL-94垂直燃烧和锥形量热测试（CCT）进行了表征。 EP / DiDOPO5 / OLDH5复合材料的LOI从21.8％增加到31.5％，并且该复合材料在UL-94垂直燃烧测试中表现出V-0等级。此外，EP / DiDOPO5 / OLDH5复合材料表现出最高的拉伸强度，较低的峰值放热速率和总放热值。此外，扫描电子显微镜观察显示，EP / DiDOPO / OLDH复合材料的连续焦炭残渣明显更多。热重分析和CCT显示，DiDOPO和OLDHs发挥气相和冷凝相的阻燃作用。总体而言，不同的阻燃性能与每种复合材料的特性有关。 EP基体中的分散状态;和燃烧过程中的结构变化。

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