Nitroxide-mediated radical polymerization in microemulsion

被引：36

作者：

Wakamatsu, Junpei ^{[1
]}

Kawasaki, Masahiro ^{[1
]}

Zetterlund, Per B. ^{[1
]}

Okubo, Masayoshi ^{[1
]}

机构：

[1] Kobe Univ, Grad Sch Engn, Dept Sci & Chem Engn, Kobe, Hyogo 6578501, Japan

来源：

MACROMOLECULAR RAPID COMMUNICATIONS | 2007年 / 28卷 / 24期

关键词：

controlled/living polymerization; kinetics (polym.); microemulsion; molecular weight distribution; nitroxide;

D O I：

10.1002/marc.200700576

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Nitroxide-mediated polymerizations of styrene in microemulsion have been carried out at 125 degrees C using the cationic surfactant tetradecyltrimethylammonium bromide and the nitroxides 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO) and N-tert-butyl-N-[1-diethylphosphono-(2,2-dimethylpropyl)] nitroxide (SG1). TEMPO-mediated polymerizations were extremely slow, with large particles (d(n)=39-129 nm) and broad molecular weight distributions (MWDs). The origin of the broad MWDs was likely significant alkoxyamine decomposition and differing diffusion rates of monomer and low MW alkoxyamines (and nitroxide) between monomer-swollen micelles and polymer particles. SG1-mediated polymerizations proceeded at higher rates, resulting in nanoparticles (d(n)= 21-37 nm) and lower (M) over bar (w)/(M) over bar (n) than for TEMPO.

引用

页码：2346 / 2353

页数：8

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