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Study of the rheological properties of polypropylene/talcanoclay ternary hybrid nano composites

机译：聚丙烯/滑石/纳米粘土三元杂化纳米复合材料的流变性能研究

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Modification of polypropylene (PP) properties by the addition of particulate fillers has been of interest for several years. In the recent years, the simultaneous use of nanofillers and conventional reinforcing fillers and study of the effect of these hybrid systems on various properties of composite has gained the attention of many researchers. In this paper, nanocomposites based on PP/Talc/Nanoclay were prepared at various filler levels via melt compounding of the ingredients in a twin-screw extruder. Here, a polypropylene grafted maleic anhydride (PP-g-MA)/Nanoclay master batch was prepared at 140 oC. The masterbatch was then used to prepare ternary compounds through a simultaneous feeding system, in a ZSK extruder at 210 °C. The extrudate was granulated and then re-extruded through a slit die, to prepare the test specimens. SEM and XRD analysis were used to characterise the systems. Rheological behaviour of the specimens was studied using a parallel plate rheometer. In the ternary blend on comparing with the neat PP, the complex viscosity (η*) is increased with increasing overall filler content; however, at low frequencies this increase is governed by the content of nano filler while at high frequencies it is mainly determined by talc content. A similar trend was also observed for the variations of storage modulus (G′) and loss modulus (G″) with frequency. The results showed that the simultaneous use of nano and micro size fillers considerably affects the melt elasticity. It is believed that the hybrid system increases the hydrodynamic effect of filler particles in the molecular motion of the polymer.
机译：通过添加颗粒状填料来改变聚丙烯（PP）性能一直是人们关注的几年。近年来，同时使用纳米填料和常规增强填料以及研究这些杂化体系对复合材料各种性能的影响已引起了许多研究人员的关注。在本文中，通过在双螺杆挤出机中熔融混合配料，在各种填料含量下制备了基于PP /滑石粉/纳米粘土的纳米复合材料。在这里，在140 oC下制备了聚丙烯接枝的马来酸酐（PP-g-MA）/ Nanoclay母料。然后将母料用于同时进料系统中，在ZSK挤出机中于210°C下制备三元化合物。将挤出物造粒，然后通过狭缝模头重新挤出，以制备测试样品。 SEM和XRD分析被用来表征系统。使用平行板流变仪研究样品的流变行为。与纯聚丙烯相比，三元共混物的复数粘度（η*）随着总填料含量的增加而增加;然而，在低频下，这种增加取决于纳米填料的含量，而在高频下，其主要取决于滑石含量。对于储能模量（G'）和损耗模量（G''）随频率的变化也观察到相似的趋势。结果表明，同时使用纳米级和微米级填料会显着影响熔体弹性。据信，杂化系统在聚合物的分子运动中增加了填料颗粒的水动力作用。

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