Investigation of the conductivity of graphene as a powder, a coating and a polymer blend

石墨烯是由碳原子组成的二维单层六边形晶格。NanoXplore在低成本、大批量和高度可扩展的石墨烯生产方面拥有专业知识。然而，NanoXplore需要更多关于其自身石墨烯粉末和基准炭黑的导电性信息，作为设计涂层配方的指南。石墨烯基涂层的新用途是天线静电放电，具有很大的商业潜力。纳米探针在石墨烯中具有重要的活性，在涂层材料和方法、耐久性、电导率等方面还有待进一步研究。本提案的总体目标是测量石墨烯粉末（相对于其他常用的导电添加剂）及其复合材料（涂层和聚合物混合物）的导电性，以更好地了解如何靶向涂层配方。具体目标如下：1)测试石墨烯和炭黑粉末的电导率；2)制备和优化导电石墨烯/聚合物涂层以耗散天线电荷；3)研究非混相聚合物共混物（半晶和非晶聚合物）的电导率。为了实现目标1，ETS最近制定了一项协议，使用高冲击聚合物样品容器和4线万用表测量固体粉末的电导率。粉末压实由万能机械试验机控制。为了实现目标2，制备了环氧树脂和聚酯涂料，并通过电导率测量优化了石墨烯含量。在目标3中，我们提出了一种通过控制共混物和界面的形态来制备超低渗透阈值导电聚合物的新方法。该研究的实际应用是超低渗透阈值导电聚合物、高性能聚合物共混物和天线静电放电材料。

Graphene is a two-dimensional monolayer of carbon atoms organized in a hexagonal lattice. NanoXplore hasexpertise on graphene production at a low cost, large volume and highly scalable. However, NanoXplore needsmore information of the conductivity of its own graphene powders and baseline carbon black as a guide todesign coating formulations. The new intended applications of graphene-based coating are electrostaticdischarge for antenna, of great commercial potential. NanoXplore has an important line of activity in grapheneand needs more investigations on several aspects including: coating materials and methods, durability,conductivity. The general objective of this proposal is to measure the conductive of graphene powders (versusother commonly used conductive additives) and its composites (coating and polymer blends) to betterunderstand how to target coating formulation. The specific objectives are the following: 1) benchmark theconductivity of the graphene and carbon black powders; 2) preparation and optimization conductivegraphene/polymer coating to dissipate charges from antennae; 3) investigation of the conductivity ofimmiscible polymer blends (semicrystalline and amorphous polymers). To achieve the objective 1, a protocolwas recently developed at ETS to measure the electrical conductivity of solid powders using a high impactpolymeric sample container and a 4-wire multimeter. Powder compaction is controlled with a universalmechanical testing machine. To achieve the objective 2, epoxy and polyester coatings are prepared and thegraphene content is optimized via the conductivity measurement. In the objective 3, we propose a novelmethod to prepare ultra-low percolation threshold conductive polymer by controlling the morphology of theblends and the interface. The tangible applications of this research are ultralow percolation thresholdconductive polymers, high performance polymer blends and antenna electrostatic discharge materials.