The electrical resistivity and thermal properties of multi-walled carbon nanotube/polypropylene (MWCNT/PP) composites have been investigated in the presence of coupling agents applied for improving the compatibility between the nanotubes and the polymer. A novel olefin-maleic-anhydride copolymer and an olefin-maleic-anhydride copolymer based derivative have been used as compatibilizers to achieve better dispersion of MWCNTs in the polymer matrix. The composites have been produced by extrusion followed by injection moulding. They contained different amounts of MWCNTs (0.5, 2, 3 and 5 wt%) and coupling agent to enhance the interactions between the carbon nanotubes and the polymer. The electrical resistivity of the composites has been investigated by impedance spectroscopy, whereas their thermal properties have been determined using a thermal analyzer operating on the basis of the periodic thermal perturbation method. Rheological properties, BET-area and adsorption-desorption isotherms have been determined. Dispersion of MWCNTs in the polymer has been studied by scanning electron microscopy (SEM)

14This work is dedicated to the synthesis of carbon nanotube from pyrolysis gases obtained by plastics. Virgin and 15 waste plastics (polyethylene, polypropylene, polystyrene, polyamide, polyvinyl-chloride, municipal plastic waste) 16were used as raw materials and fed into a horizontal tubular reactor and pyrolyzed without catalyst at 560-570°C. 17Raw materials could be transformed into 14-32% gases and 15-44% pyrolysis oils, depending on the type of raw 18 materials. Pyrolysis of municipal plastic waste produced the highest gas yield, while pyrolysis of virgin 22were used. Both gaseous and oil products of pyrolysis were investigated by gas-chromatography. The produced 23CNTs were added as reinforcement into a commercial low density polyethylene matrix using heated two roll mill 24 and then specimens for testing were manufactured. Especially the reinforcing effects of carbon nanotube were 25 investigated through the measuring of tensile and Charpy impact properties of the CNTs-LDPE polymers.

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Carbon nanotubes (CNTs) are promising additives for polymer composites due to their excellent special mechanical, electrical, and thermal properties. Carbon nanotubes are able to change the different insulating polymers into electrically conductive materials. In spite of all their special and advantageous properties their use is hindered as the nanotubes are difficult to disperse in the polymer matrix. Homogenous distribution of the nanotubes in the matrix is an important point of view of composite production. The electrical resistivity of MWCNT/PP (multi-walled carbon nanotube/polypropylene) composites produced with application of compatibilizers have been investigated. Polyalkenyl-poly(maleic-anhydride) (PMA) and polyalkenylpoly(maleic-anhydride)-ester-amide (PMAEA) have been used as compatibilizers to promote dispersion of MWCNT into the polymer matrix. The composites contained different amounts of MWCNT (0.5, 2, 3 and 5 wt%) and compatibilizers to promote the interaction between the MWCNTs and the polymer. The composites were produced with injection moulding. The electrical resistivities of the composites have been investigated by impedance spectroscopy.