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Injection-moulding compounding of PP polymer nanocomposites

机译:PP聚合物纳米复合材料的注塑复合

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摘要

The objective of this study is the comparison of different compounding techniques and their influence on the Youngs modulus. Both, conventional processing of polymer nanocomposites and processing in the worldwide unique Injection Molding Compounder (PNC-IMC) were evaluated. Additionally the effects of nanofillers on the thermal conductivity of polymer nanocomposites were investigated at various pressures.In comparison to the conventional compounding process, where the compound has to be pelletized and fed into the injection molding machine for the second plasticizing process, the injection molding compounding combines these two processing steps. The material compounding and the subsequent injection molding are done directly by only one plasticizing process by the use of a heated melt line and a melt accumulator. In this study, both of these techniques were used for the production of polymer nanocomposites. This paper shows the different effects of processing techniques, screw speed, counter-pressure and different extruder length on the Youngs modulus and demonstrates that for the improvements a compromise between shear energy input and residence time is essential. The increase of thermal conductivity by using nanofillers compared to the virgin polypropylene is shown. The investigated increase in thermal conductivity should be very interesting for the industry in terms of cycle time reduction in the injection molding process. These very first results give a good overview on both the possibilities and the limitations of the innovative concept of the PNC-IMC. Further studies on the detailed understanding concerning exfoliation and intercalation of layered silicates in polymer melt will be done.
机译:这项研究的目的是比较不同的混合技术及其对杨氏模量的影响。评估了聚合物纳米复合材料的常规加工方法以及在全球范围内独特的注塑成型复合机(PNC-IMC)中的加工方法。此外,还研究了纳米填料对聚合物纳米复合材料在各种压力下的热导率的影响。与常规复合工艺相比,常规复合工艺必须将颗粒进行造粒并送入第二次塑化工艺的注塑机中,注塑复合结合了这两个处理步骤。通过使用加热的熔体管线和熔体累积器,仅通过一个塑化过程即可直接完成材料混合和后续的注塑成型。在这项研究中,这两种技术都用于生产聚合物纳米复合材料。本文显示了加工技术,螺杆速度,反压和不同的挤出机长度对杨氏模量的不同影响,并证明了为改善这一点,必须在剪切能输入和停留时间之间做出折衷。显示了与原始聚丙烯相比,通过使用纳米填料的导热系数的增加。就减少注塑成型过程中的循环时间而言,所研究的导热系数的增加对于工业界应该是非常有趣的。这些最初的结果很好地概述了PNC-IMC创新概念的可能性和局限性。将对有关聚合物熔体中层状硅酸盐的剥落和嵌入的详细理解进行进一步的研究。

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