We investigate the effect of minor phase rheological properties and compatibilizer on the phase morphology and graphene 3D structure in polyamide-6 (PA6)/polyolefin elastomer (POE) blends. It is revealed that in blends containing low viscosity (LV) POE, graphene is better dispersed facilitating its localization at the interface. In the blend containing high viscosity (HV) POE with poor graphene dispersion, large graphene aggregates are observed inside the POE phase with less interfacial coverage. Interestingly, graphene induces a co-continuous morphology and electrical and rheological percolation in both systems, although at a lower graphene content for the LV system. The LV system exhibits a more interconnected morphology, while in the HV system we observe a compact fractal-like POE structure with a lower degree of interconnectivity. Our morphological observation suggests that co-continuous morphology in the LV system is dominated by sheet formation, while in the HV system it is dominated by coalescence between moderately elongated domains. Fractal analysis of the graphene 3D network (based on the rheological characterization) is correlated with the higher degree of connectivity of the graphene 3D structure in the LV system. The 2D fractal dimension of the POE phase (host phase for graphene) is in line with the fractal dimension of the graphene flocs, indicating that the graphene flocs influence the blend morphology. The addition of compatibilizer to the HV system did not result in improved electrical properties.

中文翻译：

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PA6/POE共混纳米复合材料的分形结构及其动力学性能

我们研究了次相流变特性和相容剂对聚酰胺 6 (PA6)/聚烯烃弹性体 (POE) 共混物中的相形态和石墨烯 3D 结构的影响。据透露，在含有低粘度 (LV) POE 的共混物中，石墨烯分散得更好，有助于其在界面处的定位。在含有高粘度 (HV) POE 且石墨烯分散性差的混合物中，在 POE 相内观察到大的石墨烯聚集体，界面覆盖率较低。有趣的是，尽管 LV 系统的石墨烯含量较低，但石墨烯在这两个系统中都会引起共连续形态以及电学和流变学渗滤。低压系统表现出更互连的形态，而在高压系统中，我们观察到紧凑的分形 POE 结构，互连程度较低。我们的形态学观察表明，LV 系统中的共连续形态以片状形成为主，而在 HV 系统中，它以适度伸长的域之间的聚结为主。石墨烯 3D 网络的分形分析（基于流变学表征）与 LV 系统中石墨烯 3D 结构的更高程度的连通性相关。POE 相（石墨烯的主体相）的二维分形维数与石墨烯絮凝物的分形维数一致，表明石墨烯絮凝物影响共混形态。向 HV 系统中添加相容剂并未导致电性能改善。而在 HV 系统中，它主要由适度伸长的域之间的聚结主导。石墨烯 3D 网络的分形分析（基于流变学表征）与 LV 系统中石墨烯 3D 结构的更高程度的连通性相关。POE 相（石墨烯的主体相）的二维分形维数与石墨烯絮凝物的分形维数一致，表明石墨烯絮凝物影响共混形态。向 HV 系统中添加相容剂并未导致电性能改善。而在 HV 系统中，它主要由适度伸长的域之间的聚结主导。石墨烯 3D 网络的分形分析（基于流变学表征）与 LV 系统中石墨烯 3D 结构的更高程度的连通性相关。POE 相（石墨烯的主体相）的二维分形维数与石墨烯絮凝物的分形维数一致，表明石墨烯絮凝物影响共混形态。向 HV 系统中添加相容剂并未导致电性能改善。POE 相（石墨烯的主体相）的二维分形维数与石墨烯絮凝物的分形维数一致，表明石墨烯絮凝物影响共混形态。向 HV 系统中添加相容剂并未导致电性能改善。POE 相（石墨烯的主体相）的二维分形维数与石墨烯絮凝物的分形维数一致，表明石墨烯絮凝物影响共混形态。向 HV 系统中添加相容剂并未导致电性能改善。