Abstract The thermal stability and flame retardancy properties of polypropylene (PP) nanocomposites containing graphene nanoplatelets (GNPs), glass fibres (GFs) or a hybrid mixture of the two fillers were investigated. The GNPs enhanced the thermal stability of the nanocomposites by at least 48 °C as a result of the nanoconfinement of the polypropylene chains and the prevention of the emission of the gaseous molecules during decomposition. Pyrolysis combined with gas chromatography and mass spectroscopy showed that the decomposition mechanism of the polymer was not altered by the presence of the nanofillers and the alkenes that comprised of 3n carbon atoms were the main degradation products. Cone calorimetry tests revealed a significant delay of the ignition under irradiation with the addition of GNPs to the PP. Furthermore, the GNPs lowered the combustion rate of the PP due to the formation of a carbonaceous protective layer that acted as a barrier to heat and mass transfer. The lightweight materials prepared show promising results for applications where high thermal stability along with fire retardancy are a prerequisite, such as parts for vehicles or aircraft.

中文翻译：

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用混合石墨烯/玻璃纤维填料增强聚丙烯的增强的耐热和阻燃性能

摘要 研究了含有石墨烯纳米片 (GNP)、玻璃纤维 (GF) 或两种填料混合混合物的聚丙烯 (PP) 纳米复合材料的热稳定性和阻燃性能。由于聚丙烯链的纳米限制和防止分解过程中气体分子的排放，GNP 将纳米复合材料的热稳定性提高了至少 48°C。热解结合气相色谱和质谱表明，聚合物的分解机制并未因纳米填料的存在而改变，而由 3n 个碳原子组成的烯烃是主要的降解产物。锥形量热法测试表明，在 PP 中添加 GNP 会显着延迟辐照下的点火。此外，由于形成了碳质保护层，GNP 降低了 PP 的燃烧速率，该保护层充当了热量和质量传递的屏障。制备的轻质材料在高热稳定性和阻燃性是先决条件的应用中显示出有希望的结果，例如车辆或飞机的零件。