Fluorenone-amine mixtures find commercial applications in photocure processes prompting detailed studies of the kinetics of polymerization and molecular weights of polymeric products for methyl methacrylate homopolymerization in benzene at 30 degrees C, photoinitiated by fluorenone and several derivatives. Photoinitiation of methyl methacrylate polymerization utilizing copolymers with pendent fluorenone units has been studied to help clarify the very complex effects of amines on initiation and termination processes. It is concluded that initiation by the fluorenone derived (semipinocol) radical is not important and hence graft copolymer formation (and presumably increased rates of photocure) for given systems is likely to be more effective when using polymers with pendent amine units rather than pendent ketone rings.