Tetraphenylethane iniferters - 8. Diphenylmethane diisocyanate-based polyurethane iniferter for 'living' radical polymerization of methyl methacrylate

摘要

A novel polyurethane iniferter, synthesized from equal moles of 4,4'-diphenylmethane diisocyanate and 1,1,2,2-tetraphenyl-1,2-ethanediol was used to polymerize methyl methacrylate. The rate equation and overall activation energy have been determined using kinetic results. As the polymerization time and conversion increased, molecular weight of the polymethyl methacrylate also increased. Postpolymerization of polymethyl methacrylate in the presence of methyl methacrylate and styrene yields high molecular weight polymethyl methacrylate homopolymers and polymethyl methacrylate-polystyrene block copolymers respectively. Hence, the present polyurethane iniferter acts as a thermal iniferter and follows "living" radical polymerization. (C) 1997 Elsevier Science Ltd.