Synthesis of three‐arm star block copolymers

We describe the synthesis and characterization of three‐arm star block copolymers based on polystyrene, poly(ethylene oxide), poly(ϵ‐caprolactone), poly(methyl methacrylate), poly(tert‐butyl methacrylate) and poly(L‐lactide) blocks. The copolymers were obtained by a route consisting of two successive initiation steps on functional macroinitiator. Some results on micellization and crystallization are given. They indicate an increase in the miscibility of different incompatible blocks.