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Thermal modelling of hybrid composites of nano cenosphere and polycarbonate for a thermal protection system

机译：纳米孔隙与聚碳酸酯杂化复合材料的热保护系统热模型

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The disposal of Fly ash cenosphere is a heavy challenge for various coal and thermal power plants. In this perspective, the present research work aims at using the waste product of the thermal power plants as filler in engineering plastic as an alternative to thermosets as matrices for high performance composites. The Fly ash cenosphere (FAC) fillers reinforced polycarbonate (PC) composites were fabricated using an economically and environmentally viable method of melt extrusion with varying concentration of filler as 5, 10, 20, 30, 40 and 50 wt%. FESEM were carried out to examine the morphology of the composite, which reflects a good dispersion and strong interfacial interaction between PC and modified FAC than the unmodified counterpart. The characteristic peaks at 2363 and 2930 cm(-1) in the FTIR corroborate the interaction between cenosphere particles and the silane coupling agent. Thermogravimetric analysis (TGA) substantiate that PC-FAC had good thermal stability with a high char yield of 70% (which is almost thrice than that for unfilled PC) at 700 degrees C in a nitrogen atmosphere. The XRD pattern displays the characteristic peaks at (002) (100) and (110) which affirms the presence of turbostratic carbon with a crumbled hexagonal structure. Effective thermal conductivity of the composite was mathematically expressed by the Maxwell model of thermal conductivity and the computed value was 0.13 W m(-1) degrees C, with a 29% decrement compared to pristine PC.
机译：对于各种燃煤和热电厂而言，粉煤灰中空层的处置是一个严峻的挑战。从这个角度出发，本研究工作的目的是使用热电厂的废品作为工程塑料中的填料，替代热固性塑料作为高性能复合材料的基质。粉煤灰空心球（FAC）填料增强的聚碳酸酯（PC）复合材料是采用经济和环境可行的熔融挤出方法制造的，其中填料的浓度为5、10、20、30、40和50 wt％（变化）。进行了FESEM来检查复合材料的形貌，这反映了PC和改性FAC相比未改性的对应物具有良好的分散性和较强的界面相互作用。 FTIR中2363和2930 cm（-1）处的特征峰证实了空心球颗粒与硅烷偶联剂之间的相互作用。热重分析（TGA）证明PC-FAC在氮气氛中在700摄氏度下具有良好的热稳定性，并具有70％的高炭产率（几乎是未填充PC的三倍）。 XRD图谱显示在（002），（100）和（110）处的特征峰，证实存在具有破碎的六边形结构的涡轮层碳。复合材料的有效导热系数由Maxwell导热系数模型数学表示，计算值为0.13 W m（-1）摄氏度，与原始PC相比减少了29％。

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