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Multiarm star block copolymers via Diels-Alder click reaction



Two types of multiarm star block copolymers: (polystyrene)m-poly(divinylbenzene)-poly(methyl methacrylate)n, (PS)m-polyDVB-(PMMA)n and (polystyrene)m-poly(divinylbenzene)-poly(tert-butyl acrylate)k, (PS)m-polyDVB-(PtBA)k were successfully prepared via a combination of cross-linking and Diels–Alder click reactions based on “arm-first” methodology. For this purpose, multiarm star polymer with anthracene functionality as reactive periphery groups was prepared by a cross-linking reaction of divinyl benzene using α-anthracene end functionalized polystyrene (PS-Anth) as a macroinitiator. Thus, obtained multiarm star polymer was then reacted with furan protected maleimide-end functionalized polymers: PMMA-MI or PtBA-MI at reflux temperature of toluene for 48 h resulting in the corresponding multiarm star block copolymers via Diels–Alder click reaction. The multiarm star and multiarm star block copolymers were characterized by using 1H NMR, SEC, Viscotek triple detection SEC (TD-SEC) and UV. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 178–187, 2009