Abstract We investigate the effect of graphene localization on the morphology and properties of Polyamide 6 (PA6)/Polyolefin elastomer (POE) blends. Two systems with different compositions were studied: (i) 60/40 (a composition near phase inversion) and (ii) 80/20 (a highly asymmetric composition). In this study, we demonstrate that the migration behavior of graphene is strongly dependent on its dispersion state, which is determined by mixing order. We show that the neat 60/40 (PA6/POE) blend has an unstable co-continuous morphology which breaks up over time during annealing to a droplet-matrix morphology with POE being the continuous phase. The addition of 3wt% graphene leads to co-continuous morphologies independent of mixing order. In the case of 80/20 systems, preparation of nanocomposites with a POE master batch resulted in elongated POE dispersed domains which becomes a co-continuous morphology at higher level of graphene content (1.5wt%). However, we observed a decrease in the continuity of the POE phase in the nanocomposite containing 3%wt of graphene due to a reduction of coalescence. Our rheological and electrical measurements revealed that the graphene formed a stronger percolated structure in 80/20 blend containing 3wt% of graphene in comparison to 60/40/3 nanocomposites, which resulted in lower electrical resistivity. The electrical percolation threshold in this system is 0.66wt% which demonstrates that using graphene to induce co-continuity in a highly asymmetric composition is a promising approach to design electrically conductive blends with a very low percolation threshold.

中文翻译：

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使用石墨烯操纵 PA6/POE 共混物的形态以实现平衡的电气和机械性能

摘要 我们研究了石墨烯定位对聚酰胺 6 (PA6)/聚烯烃弹性体 (POE) 共混物的形态和性能的影响。研究了具有不同组成的两个系统：（i）60/40（接近相转化的组成）和（ii）80/20（高度不对称的组成）。在这项研究中，我们证明了石墨烯的迁移行为强烈依赖于其分散状态，而分散状态由混合顺序决定。我们表明，纯 60/40 (PA6/POE) 混合物具有不稳定的共连续形态，在退火成液滴-基质形态（POE 是连续相）的过程中，该形态会随着时间的推移而分解。添加 3wt% 的石墨烯导致与混合顺序无关的共连续形态。在 80/20 系统的情况下，用 POE 母料制备纳米复合材料导致 POE 分散域拉长，在更高水平的石墨烯含量 (1.5wt%) 下成为共连续形态。然而，我们观察到由于聚结减少，含有 3%wt 石墨烯的纳米复合材料中 POE 相的连续性降低。我们的流变学和电学测量表明，与 60/40/3 纳米复合材料相比，石墨烯在含有 3wt% 石墨烯的 80/20 混合物中形成更强的渗透结构，从而导致更低的电阻率。该系统中的电渗透阈值为 0.66wt%，这表明使用石墨烯在高度不对称的组合物中诱导共连续性是设计具有非常低渗透阈值的导电混合物的有前途的方法。