Abstract
Truck tire particles were pyrolysed at 490 °C at atmospheric pressure and under vacuum, respectively. The recovered pyrolytic carbon black (CB P) was heated in a post-pyrolysis process at temperatures ranging from 670 to 860 °C. The CB P were studied in comparison to a commercial tire carbon black by low-pressure nitrogen adsorption and surface spectroscopic methods (ESCA and SIMS). Furthermore, the CB P properties were correlated to their electrical conductivities. During tire pyrolysis, carbonaceous deposits are formed on the CB P surface and between the carbon black particles. These deposits have a lower polyaromatic character as compared with the surface of the commercial carbon black. Therefore, the electrical conductivity of CB P is lower as compared with commercial blacks. Fewer deposits are formed during vacuum pyrolysis as compared with atmospheric pyrolysis. Upon heating, a portion of the deposits is desorbed and the polyaromatic character of the CB P surface increases. The CB P conductivity increases as well, in the case of vacuum pyrolysis CB P, to values higher than commercial blacks.
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