Synthesis of Well-Defined Star Block Copolymers Using 1,1-Diphenylethylene Chemistry

摘要

We described the use of 1,1 diphenylethylene derivatives in the synthesis of well-defined star block copolymers. Classical end-capping of polystyryl carbanion with -CH_2CH_2OTBDMSi derivative gives a heterobifunctional macroinitiator leading to ABC star block copolymers through successive anionic and ring opening polymerizations (ROP) or anionic and atom transfer radical (ATRP) polymerizations. An unexpected reaction between polystyryl carbanion and ―CH_2OTBDMSi derivative, strongly depending on the medium polarity, opens an easy way to either A_2B or A_3B star block copolymers.