new complex initiation system consists of ceric ion

Ce(IV) and potasiumPersulfate (KPS) for acrylonitrile (AN) aqueous solution polymerization has beenstudied. From Polymerization kinetic studies it showed that the rate ofpolymerization of AN using Ce (IV)/KPS

such as CS(ceric sulfate)/KPS initiation system

is either greater than CS or KPS alone. It hinted that in the complex initiation system the formation of Ce (Ⅲ) via Ce (IV) initiation reactionwould react with KPS to regenerate Ce (IV). This is also revealed by the UV investigation

which showed that at appropriate temperature (above 50℃) Ce (III) could be oxidized by KPS and a new absorption at 330-400 nm was observed by UV spectrometer. Besides

the overall activation energy of polymerization and the effects of concentrations of Ce(IV) and KPS on polymerization were also investigated.