The electrical, morphological and rheological properties of melt and dry mixed composites of polyethylene (PE)/graphite (Gr), polypropylene (PP)/Gr and PP/nickel-coated carbon fiber (NCCF) were investigated as a function of filler type, filler content and processing temperature. The electrical conductivities of dry mixed PP/NCCF composites were increased with decreasing processing temperature. For the melt mixed PP/NCCF composites, the electrical conductivities were higher than those of the melt mixed PE/Gr and PP/Gr composites, which was attributed to the effect of the higher NCCF aspect ratio in allowing the composites to form a more conductive network in the polymer matrix than the graphite does. From the results of morphological studies, the fillers in the dry mixed PP/NCCF composites were more randomly dispersed compared to those in the melt mixed PP/NCCF composites. The increased electrical conductivities of the dry mixed composites were attributed to the more random dispersion of NCCF compared to that of the melt mixed PP/NCCF composites. The complex viscosities of the PP/Gr composites were higher than those of the PP/NCCF composites, which was attributed to the larger diameter of the graphite particles than that of the NCCF. Furthermore, the fiber orientation in the “along the flow” direction during melt mixing was attributed to the decreased complex viscosities of the melt mixed PP/NCCF composites compared those of the melt mixed PP/Gr composites.

中文翻译：

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填料特性和加工条件对含导电填料复合材料的PE和PP的电，形态和流变性能的影响

研究了聚乙烯（PE）/石墨（Gr），聚丙烯（PP）/ Gr和PP /镀镍碳纤维（NCCF）的熔融和干燥混合复合材料的电学，形态学和流变学性质，填料含量和加工温度。干混PP / NCCF复合材料的电导率随加工温度的降低而增加。对于熔融混合的PP / NCCF复合材料，其电导率高于熔融混合的PE / Gr和PP / Gr复合材料的电导率，这归因于较高的NCCF长径比使复合材料形成了更导电的效果。在聚合物基体中的网络比石墨要好。从形态学研究的结果来看，与熔融混合PP / NCCF复合材料相比，干混PP / NCCF复合材料中的填料更随机分散。与熔融混合的PP / NCCF复合材料相比，干燥混合复合材料的电导率增加归因于NCCF的分散更加随机。PP / Gr复合材料的复数粘度高于PP / NCCF复合材料的复数粘度，这归因于石墨颗粒的直径大于NCCF。此外，在熔融混合过程中沿“沿流动”方向的纤维取向归因于熔融混合PP / NCCF复合材料的复数粘度降低。与熔融混合的PP / NCCF复合材料相比，干燥混合复合材料的电导率增加归因于NCCF的分散更加随机。PP / Gr复合材料的复数粘度高于PP / NCCF复合材料的复数粘度，这归因于石墨颗粒的直径大于NCCF。此外，在熔融混合过程中沿“沿流动”方向的纤维取向归因于熔融混合PP / NCCF复合材料的复数粘度降低。与混合PP / NCCF熔融复合材料相比，干燥混合复合材料的电导率提高归因于NCCF的分散更加随机。PP / Gr复合材料的复数粘度高于PP / NCCF复合材料的复数粘度，这归因于石墨颗粒的直径大于NCCF。此外，在熔融混合过程中沿“沿流动”方向的纤维取向归因于熔融混合PP / NCCF复合材料的复数粘度降低。