Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 71, Issue 15, Pages 1706-1712Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2011.07.022
Keywords
Nanocomposites; Carbon nanotubes; Electrical properties; Surface treatments
Categories
Funding
- National Natural Science Foundation of China [50873006, 51073012]
- Ministry of Education of China [NCET-08-0711]
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Functional polypropylene (PP) nanocomposites were prepared by melt compounding with multiwalled carbon nanotubes (MWNT) as the electrically conductive component and barium titanate (BT) spherical nanoparticles as the ferroelectric component. To make PP electrically conductive, more than 3 wt.% MWNT is required. Surface modification of either MWNT or BT with titanate coupling agent further improves the electrical conductivity of the PP/MWNT/BT ternary nanocomposites. Interestingly, by modifying both MWNT and BT, 2 wt.% MWNT are sufficient to make the ternary nanocomposite electrically conductive. In addition, the incorporation of MWNT greatly increases the dielectric permittivity of PP/BT nanocomposites. However, to retain a low dielectric loss, the MWNT loading should be slightly less than the percolation threshold of the nanocomposites. The improved electrical conductivity and dielectric properties make the ternary nanocomposites attractive in practical applications. (C) 2011 Elsevier Ltd. All rights reserved.
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