| Conductive polymer composites not only have the electrical conductivity of inorganic fillers and flexibility of polymers, but also have some new properties that a single phase doesn.t possess. Certain conductive polymer composites have been paid more attention as positive temperature coefficient (PTC) material because of the advantages of low cost, excellent formability, flexibility and lightweight over the conventional inorganic ceramic PTC materials. Several conductive theories and their merits and demerits in polymer PTC conductive composites are summarized. The key factors that influence the PTC properties such as matrix material, kinds of conductive fillers, constructural composition and process technologies are analyzed in details. Some thoughts on the developing trend of this kind of materials are also presented in order to learn more about the intrinsical characteristics of them and improve their properties further. |
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