Journal article
Highly Active Bipyridine-Based Ligands for Atom Transfer Radical Polymerization
ACS macro letters, v 1(4), pp 508-512
17 Apr 2012
PMID: 35585751
Abstract
A series of 2,2'-bipyridines with 4,4'-substituents (R-bpy) were investigated for atom transfer radical polymerization (ATRP) of methyl acrylate (MA) and methyl methacrylate (MMA). Ligand substituents with a large range of Hammett parameters (R = Cl, H, Me, dinonyl (dN), MeO, and (Me)(2)N) were studied with cyclic voltammetry (CV), revealing that increasing the strength of electron donating groups (EDGs) resulted in more stable Cu-II complexes and larger ATRP equilibrium constants. Normal ATRP experiments confirmed the obtained CV data by showing the fastest rates of polymerization with R-bpy ligands containing EDGs ((Me)(2)N and MeO) and the slowest with electron withdrawing Cl. A 400-fold increase in the polymerization rate was observed with bpy ligands containing p-(Me)(2)N compared to H substituents. Linear increases in molecular weight with monomer conversion, and narrow molecular weight distributions were obtained with (Me)(2)N-bpy and MeO-bpy ligands. Low catalyst concentrations of 50 to 100 parts-per-million (ppm) were successfully employed with highly active R-bpy ligands (R = MeO and (Me)(2)N) and found to be effective in polymerizing MA and MMA, respectively, with narrow molecular weight distributions <1.3.
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Details
- Title
- Highly Active Bipyridine-Based Ligands for Atom Transfer Radical Polymerization
- Creators
- Andrew J. D. Magenau - Carnegie Mellon UniversityYungwan Kwak - Carnegie Mellon UniversityKristin Schroeder - Carnegie Mellon Univ, Dept Chem, Pittsburgh, PA 15213 USAKrzysztof Matyjaszewski - Carnegie Mellon University
- Publication Details
- ACS macro letters, v 1(4), pp 508-512
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 5
- Grant note
- 1026060 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) CHE-1026060 / U.S. National Science Foundation; National Science Foundation (NSF) CRP Consortium at Carnegie Mellon University Deutsche Forschungsgemeinschaft (DFG); German Research Foundation (DFG)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000302838300017
- Scopus ID
- 2-s2.0-84861401896
- Other Identifier
- 991020532101204721
InCites Highlights
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- Web of Science research areas
- Polymer Science