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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Enhanced thermal and flame retardant properties of flame-retardant-wrapped graphene/epoxy resin nanocomposites
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Enhanced thermal and flame retardant properties of flame-retardant-wrapped graphene/epoxy resin nanocomposites

机译：阻燃包裹石墨烯/环氧树脂纳米复合材料的增强的热和阻燃性能

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摘要

Functionalized reduced graphene oxide (FRGO) wrapped with a phosphorus and nitrogen-containing flame retardant (FR) was successfully prepared via a simple one-pot method and well characterized. Subsequently, FRGO was covalently incorporated into epoxy resin (EP) to prepare flame retardant nanocomposites. The FRGO was well dispersed in the matrix and formed strong interfacial adhesion. Thermogravimetric analysis results revealed that the presence of RGO, FR or FRGO in an EP matrix led to a slight thermal destabilization effect under air and nitrogen, which increased the char yield at 700 degrees C and reduced the maximum mass loss rate. Furthermore, the glass transition temperature of the FRGO/EP nanocomposite with an FRGO loading of 4 wt% (FRGO/EP4) was remarkably increased by 29.6 degrees C, probably due to the improved crosslinking density and confinement effect of graphene sheets on the mobility of polymer networks. The evaluation of combustion behavior demonstrated that a 43.0% reduction in the peak heat release rate (PHRR) for the FRGO/EP nanocomposite containing 2 wt% FRGO and a 30.2% reduction in the total heat release (THR) for FRGO/EP4 over pure EP were achieved by the addition of FRGO. These notable reductions in fire hazards were mainly due to the synergistic effect of FRGO and the flame retardant: the wrapped flame retardant accelerated the degradation of the EP matrix, promoting the formation of additional char residues; the flame retardant improved the thermal oxidative resistance of the graphene; a high-thermal-stability char layer, consisting of graphene sheets, retarded the permeation of heat and the escape of volatile degradation products.
机译：通过简单的一锅法成功地制备了包裹有含磷和含氮阻燃剂（FR）的功能化还原氧化石墨烯（FRGO），并进行了很好的表征。随后，将FRGO共价掺入环氧树脂（EP）中以制备阻燃纳米复合材料。 FRGO很好地分散在基质中，并形成了牢固的界面附着力。热重分析结果表明，EP基质中RGO，FR或FRGO的存在导致在空气和氮气下轻微的热失稳作用，从而在700摄氏度下增加了焦炭收率，并降低了最大质量损失率。此外，FRGO / EP纳米复合材料的FRGO含量为4 wt％（FRGO / EP4）时，其玻璃化转变温度显着提高了29.6摄氏度，这可能是由于交联密度的提高和石墨烯片材对迁移率的限制作用所致。聚合物网络。燃烧行为的评估表明，与纯净相比，含2 wt％FRGO的FRGO / EP纳米复合材料的峰值放热率（PHRR）降低了43.0％，FRGO / EP4的总放热（THR）降低了30.2％通过添加FRGO获得EP。火灾隐患的显着减少主要归因于FRGO和阻燃剂的协同作用：包裹的阻燃剂加速了EP基体的降解，促进了其他焦炭残留物的形成。阻燃剂提高了石墨烯的抗热氧化性。由石墨烯片组成的高热稳定性炭层可阻止热量渗透和挥发性降解产物的逸出。

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