Atom-transfer radical polymerization star-shaped polymers

Yuan et al. [165] reported the synthesis of well-defined dendrimer-star, block-comb polymers by the combination of living ring-opening polymerization and atom transfer radical polymerization on the basis of a dendrimer polyester. Star-shaped dendrimer PCLs were synthesized by the bulk polymerization of e-caprolactone with a dendrimer initiator. The dendrimer PCLs tiien were converted into macroinitiators via esterification with 2-bromopropionyl bromide. And the star-block copolymer dendrimer poly(s-caprolactone)-block-poly(2-hydroxyethyl... [Pg.62]

Abraham, S., Ha, C.-S., and Kim, I. (2006) Self-assembly of star-shaped polystyrene-WocA -polypeptide copolymers synthesized by the combination of atom transfer radical polymerization and ring-opening living polymerization of a-amino acid-N-carboxyanhydrides. Journal of Polymer Science Part A Polymer Chemistry,... [Pg.486]

Reversible deactivated radical polymerization processes, which have been referred to as living/controlled radical polymerizations, allow for producing polymeric materials with controlled molecular masses, low dispersities, and complex maaomolecular architectures, such as block and comb-like copolymers as well as star-shaped (co)polymers. In addition to nitroxide-mediated polymerization (NMP) ° and atom-transfer radical polymerization (ATRP), ° reversible addition fragmentation chain-transfer (RAFT) polymerization is an attractive new method. " ... [Pg.890]

This type of chemistry towards well-defined star-shaped (polymer)j,Qo is closely linked to progress made during this last decade in radical polymerization [3]. Indeed, the various controlled radical polymerizations such as nitroxide-mediated polymerization (NMP) or atom transfer radical polymerization (ATRP) allow us to produce polymer chains with tailored chain length and low polydisper-sities. Furthermore, the as-prepared chains bear at their end a function (stable radical or C—halogen bond) that can be converted under the right conditions into a macro-radical. If this latter is produced in the presence of Cgo, several chains should add to the fullerene. [Pg.99]

It has been reported that the reachon of azides with C o proceeds primarily through mono-addihon this has been widely used to attach fullerenes onto the side chains of polymers or copolymers [79-81]. Star-shaped macromolecules were obtained when PS chains prepared by atom transfer radical polymerization were converted into PS-N3 before reaction with Cgo- Even so, the mono-adducts were predominant. [Pg.114]