ABC‐type hetero‐arm star terpolymers through “Click” chemistry

Abstract

Abstract Hetero‐arm star ABC‐type terpolymers, poly(methyl methacrylate)‐polystyrene‐poly( tert ‐butyl acrylate) (PMMA‐PS‐P t BA) and PMMA‐PS‐poly(ethylene glycol) (PEG), were prepared by using “Click” chemistry strategy. For this, first, PMMA‐ b ‐PS with alkyne functional group at the junction point was obtained from successive atom transfer radical polymerization (ATRP) and nitroxide‐mediated radical polymerization (NMP) routes. Furthermore, P t BA obtained from ATRP of t BA and commercially available monohydroxyl PEG were efficiently converted to the azide end‐functionalized polymers. As a second step, the alkyne and azide functional polymers were reacted to give the hetero‐arm star polymers in the presence of CuBr/ N , N , N ′, N ″, N ″‐pentamethyldiethylenetriamine ( PMDETA) in DMF at room temperature for 24 h. The hetero‐arm star polymers were characterized by 1 H NMR, GPC, and DSC. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 5699–5707, 2006