Journal
POLYMER INTERNATIONAL
Volume 58, Issue 3, Pages 242-247Publisher
WILEY
DOI: 10.1002/pi.2530
Keywords
activators regenerated by electron transfer (ARGET); atom transfer radical polymerization (ATRP); methyl methacrylate; nitrogen-based ligand; amine-based reducing agent
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Funding
- National Science Foundation [CHE-07-15494]
- Carnegie Mellon University
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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)Br-2/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. (C) 2009 Society of Chemical Industry
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