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Nitroxide-Mediated Radical Precipitation Polymerization of Styrene in Supercritical Carbon Dioxide

✍ Scribed by Ronan McHale; Fawaz Aldabbagh; Per B. Zetterlund; Masayoshi Okubo

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
247 KB
Volume
208
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Nitroxide‐mediated controlled/living radical precipitation polymerization of styrene in supercritical carbon dioxide has been performed using SG1 and AIBN as mediator and initiator, respectively. The equivalent bulk polymerization proceeded at a rate ≈1.58 times faster than the precipitation polymerization. The number of chains increased with conversion to a similar extent in precipitation and bulk systems. A chain transfer mechanism to the Diels‐Alder dimer is used to explain the increase in numbers of chains. High conversions were also achieved for a conventional precipitation polymerization of styrene in scCO~2~ at 110 °C. The polymer was obtained as a powder, which contained cavities when observed under an SEM.

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