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首页> 美国卫生研究院文献>Polymers >Halloysite Nanotubes and Silane-Treated Alumina Trihydrate Hybrid Flame Retardant System for High-Performance Cable Insulation
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Halloysite Nanotubes and Silane-Treated Alumina Trihydrate Hybrid Flame Retardant System for High-Performance Cable Insulation

机译：Halloysite Nanotubes和硅烷处理的氧化铝三水合物混合动力阻燃系统适用于高性能电缆绝缘

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The effect of the presence of halloysite nanotubes (HNTs) and silane-treated alumina trihydrate (ATH-sil) nanofillers on the mechanical, thermal, and flame retardancy properties of ethylene-vinyl acetate (EVA) copolymer/low-density polyethylene (LDPE) blends was investigated. Different weight percentages of HNT and ATH-sil nanoparticles, as well as the hybrid system of those nanofillers, were melt mixed with the polymer blend (reference sample) using a twin-screw extruder. The morphology of the nanoparticles and polymer compositions was studied using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The mechanical properties, hardness, water absorption, and melt flow index (MFI) of the compositions were assessed. The tensile strength increases as a function of the amount of HNT nanofiller; however, the elongation at break decreases. In the case of the hybrid system of nanofillers, the compositions showed superior mechanical properties. The thermal properties of the reference sample and those of the corresponding sample with nanofiller blends were studied using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Two peaks were observed in the melting and crystallization temperatures. This shows that the EVA/LDPE is an immiscible polymer blend. The thermal stability of the blends was improved by the presence of HNTs and ATH-sil nanoparticles. Thermal degradation temperatures were shifted to higher values by the presence of hybrid nanofillers. Finally, the flammability of the compositions was assessed. Flammability as reflected by the limiting oxygen index (OI) was increased by the presence of HNT and ATH-sil nanofiller and a hybrid system of the nanoparticles.
机译：埃洛石纳米管（HNTS）和硅烷处理的氧化铝三水合物（ATH-SIL）纳米填料上的乙烯 - 醋酸乙烯酯的机械，热，和阻燃性能的存在的影响（EVA）共聚物/低密度聚乙烯（LDPE）共混物进行了研究。 HNT和ATH-SIL纳米粒子的不同重量百分比，以及那些纳米填料的混合动力系统中，进行熔融与聚合物共混物（参考样品），使用双螺杆挤出机中混合。使用扫描电子显微镜（SEM）和能量色散谱（EDS），纳米颗粒和聚合物组合物的形态进行了研究。机械性能，硬度，吸水性和熔体流动的组合物进行了评估指数（MFI）。抗拉强度随着HNT纳米填料的量的函数;然而，断裂伸长率降低。在纳米填料的混合动力系统的情况下，该组合物表现出优异的机械性能。使用差示扫描量热法（DSC）和热重分析（TGA）的参考样品和那些与纳米填料共混物中的对应样本的的热性能进行了研究。在熔融和结晶温度，观察到两个峰。这表明，EVA / LDPE是不混溶的聚合物共混物。共混物的热稳定性通过HNTS和ATH-SIL纳米颗粒的存在改进。热降解温度通过混合纳米填料的存在下转移到更高的值。最后，该组合物的易燃性进行了评估。如由极限氧指数（OI）反射的可燃性增加了HNT和ATH-SIL纳米填料的存在和所述纳米颗粒的混合动力系统。

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