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Controlled radical polymerization of styrene in the presence of nitronyl nitroxides

✍ Scribed by Takeo Shigemoto; Krzysztof Matyjaszewski

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
248 KB
Volume
17
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Bulk radical polymerization of styrene in the presence of nitronyl nitroxides (2‐(4‐substituted phenyl)‐4,4,5,5‐tetramethyl‐4,5‐dihydroimidazolyl‐1‐oxyl 3‐oxide) was studied. All nitronyl nitroxides, like other nitroxyl radicals such as 2,2,6,6‐tetramethylpiperidine 1‐oxyl radical (TEMPO), act as reversible radical scavengers. The efficiency of controlling the polymerization is affected by the substituent at the 4′‐position. The efficiency increases with electron donating strength of 4′‐substituents, at least at the beginning of the reaction. However, the thermal stability of nitronyl nitroxides decreases in the same order. Thus, TEMPO is more suitable than nitronyl nitroxides for controlled/“living” radical polymerization of styrene.

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