Heat of immersion calorimetry studies of carbon blacks

Abstract

Immersional heats of carbon blacks into n-heptane and water have been investigated. It has been found that the dispersioncomponent of the carbon black surface free energy ( ψ s d) calculated from heat of immersion data slightly decreases with the surface oxygen concentration, which is suggested to be caused by the partial perturbation of the graphitic structure on the carbon black surface. ( ψ s d) was also calculated from the nitrogen adsorption data and compared with that from heat of immersion data. The heat of immersion in water increases with the carbon black surface oxygen concentration. The ozone oxidation of the carbon black has been found to improve the filled-rubber properties for a polar rubber (nitrile butadiene rubber), but to decrease the properties for a non-polar rubber (natural rubber).