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Citation: LI Wen-Chun, SHEN Lie, SUN Jin, ZHENG Qiang. Preparation and Electrical Properties of Multiwalled Carbon Nanotubes Filled High-density Polyethylene Composites[J]. Chinese Journal of Applied Chemistry, ;2006, 23(1): 64-68. shu

Preparation and Electrical Properties of Multiwalled Carbon Nanotubes Filled High-density Polyethylene Composites

1.
Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027

Corresponding author: ZHENG Qiang,
Received Date: 7 March 2005
Available Online: 20 August 2005
Fund Project: 国家自然科学基金资助重点项目(50133020) (50133020)国家杰出青年基金(50125312)资助 (50125312)

Multiwalled carbon nanotubes(MWNTs) filled high-density polyethylene (HDPE) composites were prepared by melt blending.Electrical properties, especially the resistivity-temperature characteristics of the composites, were investigated.The results show that the composites filled with MWNTs have a perfect conductivity and the electrical percolation threshold is about 1%~2% (mass fraction).A special resistivity-temperature characteristic,"V-PTC" characteristic, was found, which exhibited that when the mass fraction of MWNTs exceeded the electrial percolation threshold, the resistivity of the composites first decreased (NTC effect) as the temperature increased, while it increased abruptly when the temperature approached melting point(T_m) of the matrix(PTC effect).It should be noted that this phenomenon has not been found in polymer-based composites filled with other conductive particles, such as carbon black, graphite, carbon fiber, and so on.This V-PTC characteristic is due to the expanding of the matrix volume and the relaxation of the MWNTs entanglement.Maleic anhydride grafted styrene-(ethylene-co-butylene)-sryrene copolymer(MA-g-SEBS) acts as a compatibilizer to MWNTs and HDPE, which improves the interaction between filler and polymer matrix, and thus almostly eliminated the V-PTC characteristic through restricting the movement of the filler.
- carbon nanotubes,
- high-density polyethylene,
- percolation threshold,
- electrical properties,
- V-PTC characteristic
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