Synthesis of Well-Defined High-Density Branched Polymers Carrying Two Branch Chains in Each Repeating Unit by Coupling Reaction of BnBr-Functionalized Polystyrenes with Polymer Anions Comprised of Two Polymer Segments
| Autor: | Akira Hirao, Takumi Watanabe, Sang Woog Ryu, Hitoshi Asada |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry Polymer architecture Polymer Styrene Inorganic Chemistry chemistry.chemical_compound Anionic addition polymerization chemistry Polymerization Polymer chemistry Materials Chemistry Copolymer Polystyrene Structural unit |
| Zdroj: | Macromolecules. 37(17):6291-6298 |
| ISSN: | 0024-9297 |
| Popis: | A series of high-density branched polymers have been synthesized by the coupling reaction of poly(4-(3-(4-bromomethylphenyl)propyl)styrene with polymer anion comprised of two same or different polymer chains, prepared from polystyryllithium and either polystyrene or polyisoprene with 1,1-diphenylethylene chain-end functionalization. Under certain conditions, the reaction proceeded essentially quantitatively to afford the requisite extremely high-density branched polymers carrying two branch chains in each repeating unit and having Mw values of up to 3 × 106. Furthermore, quite new graft-block copolymers with similar high-density branched architectures could also be successfully synthesized. The resulting polymers are well-defined in branched architecture and precisely controlled in chain lengths of both backbone and branch segments. It was however observed that the reaction efficiency was significantly affected by several variables such as degrees of polymerization of the backbone polymer and polymer anio... |
| Databáze: | OpenAIRE |
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