Linear-Hyperbranched Amphiphilic AB Diblock Copolymers Based on Polystyrene and Hyperbranched Polyglycerol

✍ Scribed by Emilie Barriau; Alejandra García Marcos; Holger Kautz; Holger Frey

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 220 KB
• Volume: 26
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200500184

✦ Synopsis

Abstract

Summary: A convenient three‐step strategy has been developed for the preparation of well‐defined amphiphilic, linear‐hyperbranched block copolymers by hypergrafting. The synthetic procedure is based on a combination of carbanionic polymerization with the alkoxide‐based, controlled ring‐opening multibranching polymerization of glycidol. A linear AB diblock copolymer polystyrene‐block‐polybutadiene (PS‐b‐PB) with narrow polydispersity was obtained by anionic copolymerization. Subsequent hydroxylation by hydroboration led to PS~508~‐b‐(PB‐OH)~56~, used as macroinitiator for the polymerization of glycidol under slow monomer addition conditions.

Structure of the linear‐hyperbranched amphiphilic AB diblock copolymer PS~508~‐b‐(PB~56~‐hg‐PG~x~) and an AFM micrograph of its micellar core–shell structure observed after solution casting.

magnified imageStructure of the linear‐hyperbranched amphiphilic AB diblock copolymer PS~508~‐b‐(PB~56~‐hg‐PG~x~) and an AFM micrograph of its micellar core–shell structure observed after solution casting.