Abstract Although highly electrically conductive polymer composites filled with two-dimensional graphene-based nanofillers have been considerably explored, it still remains a challenge for constructing these nanocomposites with high filler efficiency, mild fabricating condition, as well as more effective conductive network at lower nanofiller contents. To meet above objectives, a facile preparation strategy was designed, wherein the pristine graphene (pGR) was utilized as nanofiller in polystyrene (PS) particle matrix via latex technology. Owing to the absence of reduction process, the hot-processing parameters were optimized to be more gentle ones. The structural, morphological, electrical, thermal and mechanical properties of resultant PS/pGR nanocomposites with various pGR contents were systematically investigated. SEM and TEM images showed the excellent interfacial adhesion between these two materials and segregated conductive structure was well-established. The as-fabricated PS/pGR composites achieved a quite high electrical conductivity of 20.5 S/m at a relatively low pGR loading of 0.957 vol% and an ultralow electrical percolation threshold of 0.0475 vol%. The thermal conductivity (TC) increased by 2.1 times at 0.957 vol% pGR loading than neat PS and the mechanical properties also exhibited applaudable results. This novel strategy to fabricate high performance PS conductive composites based on pristine graphene as nanofillers was thus proved to be effective.

中文翻译：

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制备面向高性能和轻量化的原始石墨烯基导电聚苯乙烯复合材料

摘要 尽管填充二维石墨烯基纳米填料的高导电聚合物复合材料已经得到了大量探索，但构建这些具有高填料效率、温和制备条件以及在较低纳米填料含量下更有效导电网络的纳米复合材料仍然是一个挑战。 . 为了实现上述目标，设计了一种简便的制备策略，其中通过乳胶技术将原始石墨烯（pGR）用作聚苯乙烯（PS）颗粒基质中的纳米填料。由于没有还原过程，热加工参数被优化为更温和的参数。系统地研究了具有不同 pGR 含量的所得 PS/pGR 纳米复合材料的结构、形态、电学、热学和机械性能。SEM 和 TEM 图像显示这两种材料之间具有出色的界面粘合性，并且分离的导电结构已经确立。制造的 PS/pGR 复合材料在 0.957 vol% 的相对低 pGR 负载和 0.0475 vol% 的超低电渗透阈值下实现了 20.5 S/m 的相当高的电导率。在 0.957 vol% pGR 负载下，热导率 (TC) 比纯 PS 增加了 2.1 倍，机械性能也表现出令人称赞的结果。因此，这种基于原始石墨烯作为纳米填料制造高性能 PS 导电复合材料的新策略被证明是有效的。制造的 PS/pGR 复合材料在 0.957 vol% 的相对低 pGR 负载和 0.0475 vol% 的超低电渗透阈值下实现了 20.5 S/m 的相当高的电导率。在 0.957 vol% pGR 负载下，热导率 (TC) 比纯 PS 增加了 2.1 倍，机械性能也表现出令人称赞的结果。因此，这种基于原始石墨烯作为纳米填料制造高性能 PS 导电复合材料的新策略被证明是有效的。制造的 PS/pGR 复合材料在 0.957 vol% 的相对低 pGR 负载和 0.0475 vol% 的超低电渗透阈值下实现了 20.5 S/m 的相当高的电导率。在 0.957 vol% pGR 负载下，热导率 (TC) 比纯 PS 增加了 2.1 倍，机械性能也表现出令人称赞的结果。因此，这种基于原始石墨烯作为纳米填料制造高性能 PS 导电复合材料的新策略被证明是有效的。