多壁碳纳米管填充高密度聚乙烯复合材料的导电特性

自20世纪90年代Iijima发现碳纳米管(Carbon nanotubes，CNTs)以来，由于其独特的力学性能、电学性能和极高的纵横比，使CNTs在纳米电子器件、催化剂载体、电极材料、储氢材料等方面的应用取得了引人注目的进展，迄今，CNTs填充高分子复合材料的研究主要集中在力学增强以及光学性能的改进方面，其制备方法主要是溶液法和原位聚合方法，

Conductive Properties of Multiwalled Carbon Nanotubes Filled High-density Polyethylene Composites

Conductive properties of multiwalled carbon nanotubes(MWNTs) filled high-density polyethylene(HDPE) composites prepared by melt blending were studied. The results showed that as the MWNTs concents reach to 3%(mass fraction), the electrical conductivity of the composites changes from insulator to semiconductor, possessing resistivtiy of 1010 Ω·cm. While as the MWNTs concents reach to 5%, the composites become a good conductor. The resistivity-temperature characteristic of the composites exhibits that with the increasing of the temperature, the resistivity of the composites first decreases, while increases abruptly when the temperature approaches melting point(tm) of the matrix, indicating an existence of the negative temperature coefficient(NTC)-positive temperature coefficient(PTC) effect. It should be noted that this phenomenon can not be found in polymer-based composites filled with other conductive particles, such as carbon black, graphite, carbon fiber.