Controlled/“Living” Radical Polymerization. Kinetics of the Homogeneous Atom Transfer Radical Polymerization of Styrene

Content Provider	Semantic Scholar
Author	Matyjaszewski, Krzysztof Aleksander Patten, Timothy Xia, Jianhui
Copyright Year	1997
Abstract	The homogeneous atom transfer radical polymerization (ATRP) of styrene using solubilizing 4,4‘-dialkyl substituted 2,2‘-bipyridines yielded well-defined polymers with Mw/Mn ≤ 1.10. The polymerizations exhibited an increase in molecular weight in direct proportion to the ratio of the monomer consumed to the initial initiator concentration and also exhibited internal first-order kinetics with respect to monomer concentration. The optimum ratio of ligand-to-copper(I) halide for these polymerizations was found to be 2:1, which tentatively indicates that the coordination sphere of the active copper(I) center contains two bipyridine ligands. The exclusive role for this copper(I) complex in ATRP is atom transfer, since at typical concentrations that occur for these polymerizations (≈10-7−10-8 M), polymeric radicals were found not to react with the copper(I) center in any manner that enhanced or detracted from the observed control. ATRP also exhibited first-order kinetics with respect to both initiator and copper...
Starting Page	674
Ending Page	680
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1021/ja963361g
Volume Number	119
Alternate Webpage(s)	http://polymer.chem.cmu.edu/~kmatweb/published/our_group/1997/JACSsty.pdf
Alternate Webpage(s)	https://doi.org/10.1021/ja963361g
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article