This paper presents the characterization of carbonic functional phase based on carbon mesophase/carbon nanotubes nanocomposites used as functional filler in a polymeric matrix by optical microscopy, X-ray diffraction and functional by electrical resistivity measurements. The nanocomposites were prepared by adding of single walled carbon nanotubes (SWNT) or multi walled carbon nanotubes (MWNT) in a petroleum pitch. It was reported that SWNT behaves as either a metal or a semiconductor depending on the wrapping angle of the graphene sheet and its diameter, while MWNTs are always conductive. Carbonic functional phase was obtained by heat treatment of pitch/nanotubes mixtures at 450oC and 900oC temperatures. Polymeric composites were obtained by adding carbonic functional phase in an epoxy resin matrix. The polymeric composites were functional characterized from electrical point of view, establishing their behaviour. The electrical behaviour of the (SWNT/MWNT)/PP systems heat treated at 450�C is not largely influenced by the CNTs, because they are not creating any conducting connections. The composite systems, heat treated at 450�C, show a high resistivity of 105 ohm�cm, while the systems heat treated at 900�C show a lower electrical resistivity of 10-1 ohm�cm.

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