State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
ACS Appl Mater Interfaces. 2012 Oct 24;4(10):5281-6. doi: 10.1021/am301230q. Epub 2012 Sep 18.
Polystyrene (PS) and poly(methyl methacrylate) (PMMA) blends filled with octadecylamine-functionalized graphene (GE-ODA) have been fabricated to obtain conductive composites with a lower electrical percolation threshold according to the concept of double percolation. The dependence of the electrical properties of the composites on the morphology is examined by changing the proportion of PS and PMMA. Our results reveal that the electrical conductivity of the composites can be optimal when PS and PMMA phases form a cocontinuous structure and GE-ODA nanosheets are selectively located and percolated in the PS phase. For the PS/PMMA blend (50w/50w), the composites exhibit an extremely low electrical percolation threshold (0.5 wt %) because of the formation of a perfect double percolated structure. Moreover, the rheological properties of the composites are also measured to gain a fundamental understanding of the relationship between microstructure and electrical properties.
已制备了填充十八烷基胺功能化石墨烯（GE-ODA）的聚苯乙烯（PS）和聚甲基丙烯酸甲酯（PMMA）共混物，根据双重渗流的概念获得具有更低电渗流阈值的导电复合材料。通过改变 PS 和 PMMA 的比例来研究复合材料的电性能对形态的依赖性。我们的结果表明，当 PS 和 PMMA 相形成共连续结构并且 GE-ODA 纳米片选择性地位于 PS 相中并渗滤时，复合材料的电导率可以达到最佳。对于 PS/PMMA 共混物（50w/50w），由于形成了完美的双重渗流结构，复合材料表现出极低的电渗流阈值（0.5wt%）。此外，还测量了复合材料的流变性能，以深入了解微观结构与电性能之间的关系。
