1993 Volume 66 Issue 5 Pages 280-285
The radical graft polymerization of vinyl monomers from porous carbon black, i. e., Porousblack, initiated by pendant peroxide groups of poly (methyl methacrylate-co-t-butylperoxy-2-methacryloy-loxyethyl carbonate) retained in the pores was investigated. The copolymer was formed in the pores of the porous carbon black by the adsorption of the monomers and 2, 2'-azobisisobutyronitrile as an initiator followed by the polymerization by heating at 80°C. After the polymerization, the carbon black was purified by Soxhlet extraction with chloroform. Because of the copolymer formed in the pores, the specific surface area of the carbon black was decreased from 447 to 250 m2/g. It was found that the radical polymerization of vinyl monomers was initiated by the copolymer retained on carbon black to give the corresponding polymer-grafted carbon black : the percentage of grafting of the vinyl monomers was 55-60%. On the basis of the above results, it was concluded that pendant peroxide groups of the copolymer retained in the pores of carbon black had an ability to initiate the radical polymerization of vinyl monomers to give polymer-grafted carbon black based on the propagation of polymer from the surface. Polymer-grafted carbon black thus obtained gave a stable colloidal dispersion in a good solvent for grafted polymer.
