Fabrication and electrical properties of CNT/PP conductive composites with low percolation threshold by solid state alloying
Fabrication and electrical properties of CNT/PP conductive composites with low percolation threshold by solid state alloying
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DOI：
10.1002/pc.20895
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发表时间：
2010-06
影响因子：
5.2
通讯作者：
D. Gao;M. Zhan
中科院分区：
文献类型：
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作者：
D. Gao;M. Zhan
采用固相合金化法制备了逾渗阈值低至0.25wt%的碳纳米管/聚丙烯导电复合材料。这种固态合金化方法使用超高速机械剪切（在10，000 rpm下）来处理固态的缠结的催化生长的碳纳米管（CNT）和聚合物基质。研究了复合材料的电学性能和碳纳米管的结构和分布。结果表明，通过剪切强化过程，碳纳米管被有效地截断和分散，其长度可以得到适当的控制，充分发挥其高长径比的优势。同时，该方法还形成了线性结构的导电网络，可显著降低逾渗阈值。此外，碳纳米管可以进一步分散的作用下，通过提高加工温度提供的热能。超高速固相合金化法是制备碳纳米管填充高粘度树脂的低逾渗阈值导电复合材料的有利途径。Polym. COMPOS.，2010.© 2009年塑料工程师协会
The carbon nanotube/polypropylene conductive composites with a percolation threshold as low as 0.25 wt% were fabricated by solid state alloying. This solid state alloying method uses the super-high speed mechanical shearing (at 10,000 rpm) to process the entangled catalytically grown carbon nanotubes (CNTs) and the polymer matrix in solid state. The electrical properties of the nanocomposites and the structure and distribution of CNTs were investigated. The results indicated that via the shear-intensive process, CNTs were truncated and dispersed effectively, and their length could be controlled properly to fully exert the advantage of high aspect ratios (length-to-diameter ratios). At the same time, a linear structure conductive network which may considerably lower the percolation threshold was also formed by this method. Moreover, the CNTs could be further dispersed under the action of thermo energy provided by increasing the processing temperature. The super-high speed solid state alloying method is a favorable approach for the production of low percolation threshold conductive composites of CNTs filled high viscosity resins. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers