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Nitroxide-Mediated Radical Polymerization in Microemulsion

✍ Scribed by Junpei Wakamatsu; Masahiro Kawasaki; Per B. Zetterlund; Masayoshi Okubo

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
210 KB
Volume
28
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Nitroxide‐mediated polymerizations of styrene in microemulsion have been carried out at 125 °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 $\overline M _{\rm w} /\overline M _{\rm n}$ than for TEMPO.

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