ARGET ATRP of methyl methacrylate in the presence of nitrogen-based ligands as reducing agents

Authors

  • Yungwan Kwak,

    1. Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
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  • Krzysztof Matyjaszewski

    Corresponding author
    1. Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
    • Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA.
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Abstract

BACKGROUND: Activators regenerated by electron transfer for atom transfer radical polymerization (ARGET ATRP) employs reducing agents (e.g. ascorbic acid, tin(II) 2-ethylhexanoate) to continuously reduce a deactivator Cu(II) to an activator Cu(I) species. In this work, copper-mediated ARGET ATRP of methyl methacrylate (MMA) was studied in the presence of excess aliphatic nitrogen-based ligands that served not only as ligands but also as reducing agents.

RESULTS: Reduction of Cu(II) to Cu(I) by an excess amount of nitrogen-based ligand was followed by UV-visible spectroscopy. Well-controlled poly(methyl methacrylate) (PMMA) with low polydispersity index (PDI) was prepared in the presence of Cu(II)Br2/excess ligand via ARGET ATRP. Chain extension of PMMA with MMA was successful, resulting in low-PDI PMMA and demonstrating well-maintained end-group functionality.

CONCLUSION: Well-controlled PMMA with low PDI was prepared via ARGET ATRP in the presence of Cu(II) and nitrogen-based ligands without any additional reducing agent. Aliphatic nitrogen-based ligands for ATRP can serve as reducing agents as well as ligands. Copyright © 2009 Society of Chemical Industry

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