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| Volume 3, Issue 04 - 2007 |
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| 3 |
CONDUCTIVE POLYMER COMPOSITES WITH ULTRALOW PERCOLATION THRESHOLD CONTAINING CARBON NANOTUBES |
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| Pages 21-27 |
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| YE.P. MAMUNYA1*, N.I. LEBOVKA2, M.O. LLSUNOVA2, E.V. LEBEDEV1, A. RYBAK3, G. BOITEUX3 |
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1 Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 48 Kharkovskoe chaussee, 02160, Kiev, Ukraine
2 Institute of Biocolloidal Chemistry named after F.D. Ovcharenko, NAS of Ukraine, 2, blvr. Vernadskogo, Kyiv 03142, Ukraine
3 Laboratoire des Materiaux Polymeres et des Biomateriaux, UMR CNRS 5627 “Ingenierie des Materiaux Poly¬meres”, Universite Claude BernardLyonl, 15 Boulevard A. Latarjet, 69622 Villeurbanne Cedex, France.
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| Received 7 May 2007; accepted 21 September 2007 |
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Electrical conductivity ó and dielectric characteristics å’, tanä were investigated as function of the multiwalled carbon nanotubes (CNT) content in the PE/CNT and PVC/CNT composites prepared by hot compacting method. The com¬posites show a presence of the ultralow values of percolation threshold, öc=0.00036 in PE/CNT and öc=0.00047 in PVC/CNT. It is caused by two reasons: high anisotropy of CNT particles with aspect ratio length/diameter ~ 1000 and the presence of segregated structure of CNT within the polymer matrix with distribution of nanotubes on the bound¬aries between the polymer grains. The dielectric characteristics demonstrate the percolation behavior as well. In the vicinity of percolation threshold the values of å’ and tanä sharply increase by orders of magnitude, for PE/CNT com¬posite such effect is essentially higher. Wide range of tanä variations at low content of carbon nanotubes evidences that such composites are promising for EMI shielding materials.
Keywords: N/A |
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