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Chin. Phys. B, 2009, Vol. 18(3): 1221-1226    DOI: 10.1088/1674-1056/18/3/063

Electrical, dielectric and surface wetting properties of multi-walled carbon nanotubes/nylon-6 nanocomposites

Long Yun-Ze(龙云泽)a), Li Meng-Meng(李蒙蒙)a), Sui Wan-Mei(隋万美)a), Kong Qing-Shan(孔庆山)b), and Zhang Lei(张磊)a)
a College of Physics Science, Qingdao University, Qingdao 266071, China; b Laboratory of Fibre Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China
Abstract  This paper reports that the multi-walled carbon nanotubes (MWCNT)/nylon-6 (PA6) nanocomposites with different MWCNT loadings have been prepared by a simple melt-compounding method. The electrical, dielectric, and surface wetting properties of the CNT/PA6 composites have been studied. The temperature dependence of the conductivity of the CNT/PA6 composite with 10.0 wt% CNT loading ($\sigma _{\rm RT} \sim 10^{-4}$ S/cm) are measured, and afterwards a charge-energy-limited tunnelling model (ln $\sigma (T) \sim T^{-1/2})$ is found. With increasing CNT weight percentage from 0.0 to 10.0 wt%, the dielectric constant of the CNT/PA6 composites enhances and the dielectric loss tangent increases two orders of magnitude. In addition, water contact angles of the CNT/PA6 composites increase and the composites with CNT loading larger than 2.0 wt%even become hydrophobic. The obtained results indicate that the electrical and surface properties of the composites have been significantly enhanced by the embedded carbon nanotubes.
Keywords:  carbon nanotubes      composites      electrical conductivity      dielectric property  
Received:  09 July 2008      Revised:  13 August 2008      Accepted manuscript online: 
PACS:  73.63.Fg (Nanotubes)  
  68.08.Bc (Wetting)  
  73.40.Gk (Tunneling)  
  77.22.Ch (Permittivity (dielectric function))  
  77.22.Gm (Dielectric loss and relaxation)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10604038) and the Program for New Century Excellent Talents in University of China (Grant No NCET-07-0472).

Cite this article: 

Long Yun-Ze(龙云泽), Li Meng-Meng(李蒙蒙), Sui Wan-Mei(隋万美), Kong Qing-Shan(孔庆山), and Zhang Lei(张磊) Electrical, dielectric and surface wetting properties of multi-walled carbon nanotubes/nylon-6 nanocomposites 2009 Chin. Phys. B 18 1221

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