Carbon nanomaterials (CNM) possessing exceptional mechanical and electrical properties are promising new class of materials for special applications. Particular importance seems to have a possibility of introducing them into polymer. An incorporation of carbon nanotubes or nanofibres in a polymer system gives a promise to improve material properties as a result of physical and chemical interphase interactions. This new kind of composites based on both thermoplastics and thermosets could find a range of applications in many branches of industry. One of the manners of nanocomposites preparation is to introduce nanofiller into polymer during its synthesis (the in situ method). In order to ensure a uniform distribution of reinforced phase in the whole system nanofibres are carefully dispersed in a liquid substrate. Thermoplastic based composites, obtained this method, can be easily moulded what significantly extends the range of their applications. In this work the "in situ" synthesis as a method of polymer nanocomposites preparation as well as the effect of CNM on the properties of condensation polymers - poly(ethylene terephthalate (PET) and poly(ether-ester) block copolymer (PEE) are presented. Carbon nanomaterials consisting of amorphous carbon, carbon nanofibres and multi-walled nanotubes were synthesized using high voltage atmospheric pressure discharged plasma method (HVAPDP) and fluorinated. Polymer composites with different concentrations of modified (CNM-F) and unmodified (CNM) nanofillers were prepared and compared. For materials characterization the thermal analysis (DSC, TG), microscopic investigations (SEM), mechanical testing and electrical measurements were performed. (Presented research were financed from INTAS Research Project No. 04-80-6932)

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