Polymer composites filled with carbon black have the characteristics of positive temperature coefficient. The paper introduces the electric conduction mechanism and presents status and development trend of PTC polymer materials.

• 摘要对聚合物基PTC材料的研究现状及导电机理进行概述，对最近提出的新理论，应力模型和双临界物理模型作详细介绍，并对该类材料的研究展望作详细论述。