State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University , 220 Handan Road, Shanghai 200433, China.
Shanghai Xiyin New Materials Corporation , 135 Guowei Road, Shanghai 200437, China.
ACS Appl Mater Interfaces. 2017 Jul 5;9(26):22006-22017. doi: 10.1021/acsami.7b07328. Epub 2017 Jun 21.
Graphene-based polymer composites with superior electrical and mechanical performance are highly desirable because of their wide range of applications. However, due to the mismatch between charge jumping and the load transfer of adjacent graphene sheets, it remains difficult to achieve significant, simultaneous improvements in electrical and mechanical properties of graphene-polymer composites. To overcome this issue, we here propose an effective strategy to constructed unique 3D conductive networks in which the compatibility of graphene and polymer can be improved by controlled decoration of few-defect graphene sheets, while segregated graphene networks retain good charge-jumping capability. The final composites exhibit an ultra-low electrical conductive percolation threshold of 0.032 vol % and an ultra-high electrical conductivity of 60 S/m at only 2.45 vol %, superior to most of the reported results. They also reveal significantly improved thermodynamic properties, tensile strength, and toughness. We believe that such a simple, industrially feasible method contributes to boost the development of high-performance, functional graphene-polymer composites.
具有优异电性能和机械性能的基于石墨烯的聚合物复合材料由于其广泛的应用而备受关注。然而，由于相邻石墨烯片之间的电荷跳跃和负载转移不匹配，仍然难以同时显著提高石墨烯-聚合物复合材料的电性能和机械性能。为了克服这个问题，我们在这里提出了一种有效的策略，构建了独特的 3D 导电网络，通过控制少缺陷石墨烯片的装饰，可以提高石墨烯和聚合物的相容性，而分离的石墨烯网络保持良好的电荷跳跃能力。最终的复合材料表现出超低的电导率渗流阈值为 0.032 体积%，在仅 2.45 体积%时的电导率高达 60 S/m，优于大多数报道的结果。它们还显示出显著改善的热力学性能、拉伸强度和韧性。我们相信，这种简单、工业上可行的方法有助于推动高性能、功能性石墨烯-聚合物复合材料的发展。
