CHEMICAL INTERACTION BETWEEN CARBON-BLACK AND ELASTOMERS - CROSS-LINKING OF CHLOROSULFONATED POLYETHYLENE BY CARBON-BLACK

Surface oxidation of a carbon black leads to an increased elastomer-fi ller bonding between the chlorosulfonated polyethylene and the carbon black. The increased interaction appears to be related to the increase d concentration and reactivity of the oxygen containing sites in the o xidized carbon black, as deduced from the moisture adsorption and ther mometric titration results. The bound rubber content is substantially higher for the oxidized carbon black. The reactive surface sites of th e carbon black also promote the crosslinking of the elastomer at eleva ted temperatures.