The role of excess nitroxide in the SG1 (N-tert-butyl-N-[1-diethylphosphono-(2,2-dimethylpropyl)] nitroxide)-mediated polymerization of methyl methacrylate

被引：65
|
作者：
McHale, Ronan
Aldabbagh, Fawaz [1 ]
Zetterlund, Per B.
机构：
[1] Natl Univ Ireland Univ Coll Galway, Dept Chem, Galway, Ireland
[2] Kobe Univ, Fac Engn, Dept Sci & Chem Engn, Kobe, Hyogo 6578501, Japan
来源：
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 2007年 / 45卷 / 11期
关键词：
kinetics (polym.); radical polymerization; living polymerization; methyl methacrylate; nitroxide;
D O I：
10.1002/pola.21986
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Methyl methacrylate (MMA) polymerizations have been conducted in the presence of large excesses of N-tert-butyl-N-[1-diethylphosphono-(2,2-dimethylpropyl) nitroxide] (SG1) at 110 degrees C. It is demonstrated that such a protocol does not improve control/livingness in the nitroxide mediated polymerization (NMP) of this monomer, instead substantial levels of disproportionation between the nitroxide and propagating radical (PMMA(circle)) results. The extent of the disproportionation reaction increased with the SG1 concentration, eventually becoming the sole end forming event. Significant disproportionation between SG1 and PMMA(circle) was also observed at substantially lower temperatures (45 degrees C) in the presence of large excesses of SG1. (C) 2007 Wiley Periodicals, Inc.
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收藏
页码：2194 / 2203
页数：10
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