1999 Volume 72 Issue 8 Pages 475-481
For the surface treatment of carbon black having few functional groups, the grafting of polymers through the trapping of polymer radicals by carbon black surface was investigated. Carbon black was reacted with polymers having hydroxyl groups such as poly (ethylene glycol) (PEG) in the presence of Ce (IV) in water at 25.0°C. It was found that polymer radicals formed by the redox reaction with Ce (IV) were successfully trapped by polycondensed aromatic rings of carbon black surface to give the corresponding polymer-grafted carbon black : the percentages of grafting of PEG was determined to be 49.7%. The percentage of PEG grafting tended to increase with increasing molecular weight of PEG, but the number of moles of grafted chain decreased, because of steric hindrance of grafted chains. The surface of carbon black turned from hydrophobic to hydrophilic by grafting of PEG onto the surface.
