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首页> 外文期刊>Journal of Applied Polymer Science >Effect of end-capped nanosilica on mechanical properties and microstructure of LLLDPE/EVA blends
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Effect of end-capped nanosilica on mechanical properties and microstructure of LLLDPE/EVA blends

机译：封端纳米二氧化硅对LLLDPE / EVA共混物力学性能和微观结构的影响

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This article describes the influence of a hexamethyldisilane-treated nanosilica (end-capped SiO 2) on morphological and tensile properties of linear low-density polyethylene (LLDPE)/ethylene vinyl acetate copolymer (EVA) blends prepared by one step melt mixing process via a twin screw extruder. The treatment replaces many of the surface hydroxyl groups on the nanosilica with extremely hydrophobic trimethylsilyl groups. Transmission electron microscopic results revealed that the treated nanosilica formed small aggregates in polymer matrix and they were mostly localized in the LLDPE matrix besides localizing in EVA droplets and at LLDPE/EVA interface. These nanoparticles had compatibilizing role on the blend system and at high content changed morphology from biphasic toward a monophasic. Addition of the end-capped nanosilica to the blend and increasing its content increased the Young's modulus, tensile strength as well as elongation at break of the nanocomposites. Different models were used to predict the Young's modulus of the nanocomposites. It was found that the experimental data were better fitted by Counto model than the other models. Melt rheological investigations on the nanosilica filled LLDPE/EVA blend system showed that incorporation of the treated nanosilica, even up to 10 wt %, did not lead to a solid-like behavior at low-frequency indicating ease of processing of such highly filled system.
机译：本文介绍了六甲基乙硅烷处理的纳米二氧化硅（封端的SiO 2）对线性低密度聚乙烯（LLDPE）/乙烯乙酸乙烯酯共聚物（EVA）共混物的形态和拉伸性能的影响。双螺杆挤出机。该处理用极疏水的三甲基硅烷基取代了纳米二氧化硅上的许多表面羟基。透射电子显微镜结果表明，处理过的纳米二氧化硅在聚合物基质中形成小的聚集体，除了局限在EVA液滴和LLDPE / EVA界面外，它们大多局限在LLDPE基质中。这些纳米颗粒对共混体系具有增容作用，并且在高含量下其形态从双相变为单相。将末端封端的纳米二氧化硅添加到共混物中并增加其含量增加了纳米复合材料的杨氏模量，拉伸强度以及断裂伸长率。使用不同的模型来预测纳米复合材料的杨氏模量。发现Counto模型比其他模型更好地拟合了实验数据。对纳米二氧化硅填充的LLDPE / EVA共混体系的熔体流变学研究表明，即使处理的纳米二氧化硅的掺入量最高可达10 wt％，也不会导致低频下出现类似固体的行为，这表明易于加工这种高度填充的体系。

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