Synthesis of (meth)acrylate Block Copolymers by Ligated Anionic Polymerization |
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Authors: | Petr Vl?ek Eva ?adová Miroslav Janata Petra Látalová Luděk Toman Jaroslav K?í? Dana Kurková |
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Institution: | Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 16206 Prague 6, Czech Republic |
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Abstract: | 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. |
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Keywords: | anionic polymerization block copolymers ester-enolates (meth)acrylates tert-alkoxides |
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