Dendritic Initiators for “Living” Radical Polymerizations:  A Versatile Approach to the Synthesis of Dendritic-Linear Block Copolymers

The first use of polyether dendrons as macromolecular initiators for the controlled free radical polymerization of vinyl monomers has been demonstrated. Dendrons containing either a single benzylic TEMPO or halide functionality at their focal point have been used for the nitroxide mediated and atom...

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Veröffentlicht in:Journal of the American Chemical Society 1996-11, Vol.118 (45), p.11111-11118
Hauptverfasser: Leduc, Marc R, Hawker, Craig J, Dao, Julian, Fréchet, Jean M. J
Format: Artikel
Sprache:eng
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Zusammenfassung:The first use of polyether dendrons as macromolecular initiators for the controlled free radical polymerization of vinyl monomers has been demonstrated. Dendrons containing either a single benzylic TEMPO or halide functionality at their focal point have been used for the nitroxide mediated and atom transfer radical polymerizations, respectively. In both cases, hybrid dendritic-linear block copolymers with well-controlled molecular weights and low polydispersities can be obtained. The structure of the hybrid block copolymers is supported by SEC and spectral data. All the copolymers exhibit a single T g, indicating that both blocks are miscible. Hybrid block copolymers difficult or impossible to prepare by previous techniques have been synthesized to demonstrate the versatility of this approach.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja962159a