Synthesis of (meth)acrylate Block Copolymers by Ligated Anionic Polymerization
| Autor: | Dana Kurková, Petr Vlček, Petra Látalová, Luděk Toman, Eva Čadová, Jaroslav Kříž, Miroslav Janata |
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| Rok vydání: | 2006 |
| Předmět: |
Acrylate
Materials science Polymers and Plastics Organic Chemistry Solution polymerization Condensed Matter Physics Methacrylate chemistry.chemical_compound Anionic addition polymerization chemistry Polymerization Polymer chemistry Materials Chemistry Copolymer Organic chemistry Ionic polymerization Living anionic polymerization |
| Zdroj: | Macromolecular Symposia. 240:141-150 |
| ISSN: | 1521-3900 1022-1360 |
| Popis: | Synthetic potential of the ligated anionic polymerization (LAP) of acrylic and metacrylic esters initiated with methyl 2-lithioisobutyrate (MIB-Li) in the presence of an excess of alkali metal tert-alkoxides (prevailingly Li tert-butoxide) is presented. tert-Alkoxides form with ester-enolates, like MIB-Li, cross-aggregates of various composition, which tailor the environment of growing chain-ends, lower their nucleophilicity and restrict in this way the extent of side reactions, in particular self-termination of growing macroanions by back-biting reaction. Thus, stability of polymethacrylate living chains is sufficiently high for methacrylate and acrylate block copolymers to be synthesized. In the case of acrylate polymerization, reaction conditions must be optimized due to their high tendency to self-termination. |
| Databáze: | OpenAIRE |
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