this disclosure is directed to functionalized carbon black material that may be particularly usable for as a filler material to a number of beneficial uses , particularly in image forming devices . the disclosed functionalized carbon black material compositions include hydrophobic carbon black particles surface passivated via the use of an nb - block copolymer where the nb block contains a pentafluorostyrene - maleimide alternating polymer and the b block contains pure pentafluorostyrene . the a / b portion allows for the polymer to adsorb onto the carbon black while the b - block acts as the stabilizer in fluorinated systems . fine dispersions result from the addition of poly or p passivated carbon black to fluorinated polymers , enhancing the physical and mechanical properties . the disclosed surface passivated carbon black particles are particularly usable for improving operational characteristics of fluorosilocone - based reimageable surface layers of imaging members employed in variable data digital lithographic image forming devices .