Surface Conductivity of Molded Sheets and Films of Conductive Polymer Compounds

本研究的目标是在不牺牲机械完整性的情况下，建立一种获得聚合物和聚合物复合材料表面导电性的新技术。导电聚合物在工业应用中的应用范围从绿色轮胎的成型化合物到汽车的外部车身部件，再到电脑、笔记本电脑和手机的塑料外壳。导电聚合物的表面和整体导电性有助于消散静电，便于喷涂，加快热传导速度。在目前的技术中，整个轮胎或外部汽车车身部件是由导电聚合物化合物制成的。只有15% - 60%重量的导电颗粒的一小部分留在表面附近。在多层物品中制造单独的导电表面层需要提高成型技术和材料成分的基本知识。本研究将研究成型聚合物片材和薄膜的有效表面导电性，作为成型条件、成分和颗粒-颗粒网络形成的运动学的函数。将进行简单形状的两层复合层压板的实验成型，以演示概念并评估有效导电性。研究计划包括开发粘度-成分-电导率图，以指导导电化合物成分的选择。期望对控制界面形状和层间结合强度的参数有更好的理解，以及对材料的选择标准，以提高成本和可生产性。

The goal of this research is to establish a new technology for attaining surface conductivity in polymers and polymer composites, without sacrificing mechanical integrity. The use of conductive polymers in industrial applications ranges from molding compounds of green tires to exterior body parts of automobiles to plastic housing of computers, notebooks, and cellular phones. The surface and bulk conductivity of conductive polymers help dissipate static electricity, facilitate spray painting, and expedite the rate of heat conduction. In current technology, the whole body of tires or exterior auto body parts is molded from conductive polymer compounds. Only a small fraction of the 15 - 60% by weight of conductive particles remains near the surface. Fabricating separate conductive surface layers in multi-layer articles requires advancing the fundamental knowledge of the molding technology and the material compositions. This investigation will study the effective surface conductivity of molded polymer sheets and films as a function of the kinematics of molding conditions, composition, and particle-particle network formation. Experimental molding of simple shaped, two-layer composite laminates will be conducted to demonstrate the concepts and to evaluate the effective conductivity. The research plan includes the development of viscosity-composition-conductivity diagrams to guide the selection of the composition of conductive compounds. Improved understanding of the parameters governing the shape of the interface and the strength of interlayer bonding is expected, as well as selection criteria for materials to improve cost and productibility.