This study aimed to evaluate the impacts of different polypropylene (PP) chain configurations, i.e., linear and branched form, on the rheological, mechanical, and electrical properties of PP-based, graphite nanoplates (GnP)-reinforced nanocomposites. The incorporation of GnP with different particle size gave us constructive information about the influences of filler's dimension on the abovementioned properties. A solid-state shear pulverization (SSSP) technique followed by conventional melt mixing was employed to get GnP-filled samples prepared for better filler dispersion. Due to higher interfacial surface area, the obtained mechanical properties from finer GnP were more satisfying. However, the electrical and rheological percolation thresholds (the formation of conductive pathways) took place at a lower content of larger GnP, which is mainly due to its higher aspect ratio compared to GnP. Replacement of linear PP with branched one did not lead to conspicuous alterations in tensile modulus and strength. Based on rheological evaluations, however, the presence of side branches hindered the development of GnP sound network throughout PP matrix, so that in comparison to linear PP-based sample the augmentation of electrical conductivity of branched PP-based composites against filler loading demonstrated slower rates.

这项研究旨在评估不同的聚丙烯（PP）链结构（即线性和支链形式）对基于PP的石墨纳米板（GnP）增强的纳米复合材料的流变，机械和电学性能的影响。不同粒径的GnP的掺入为我们提供了有关填料尺寸对上述性能的影响的建设性信息。采用固态剪切粉碎（SSSP）技术，然后进行常规熔融混合，以制备GnP填充样品，以实现更好的填料分散。由于较高的界面表面积，由更细的GnP获得的机械性能更令人满意。但是，电和流变渗透阈值（导电路径的形成）发生在较大GnP的较低含量下，这主要是由于其宽高比比GnP高。用支化聚丙烯代替线性聚丙烯并没有导致拉伸模量和强度的明显变化。然而，基于流变学评估，侧支的存在阻碍了整个PP基体中GnP声网络的发展，因此与线性PP基样品相比，支化PP基复合材料对填料填充的电导率提高显示出较低的速率。