Homopolymerization and block copolymer formation in room-temperature ionic liquids using conventional free-radical initiators

Free radical addition polymerization and copolymerization has been investigated in a range of room temperature ionic liquids (RTILs). We report results on synthesis of high molecular weight acrylic polymers in RTILs, as well as results on block copolymer formation via sequential monomer addition. The latter reactions take advantage of the long-lived nature of free radicals in some of these systems. Homopolymerization under conditions where the growing radicals precipitate in the RTIL leads to simultaneous rapid rates of polymerization and high molecular weights. This method shows great promise for economical and 'green' synthesis of polymers. (C) 2002 American Chemical Society.