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Nitroxide‐Mediated Radical Precipitation Polymerization of Styrene in Supercritical Carbon Dioxide
Author(s) -
McHale Ronan,
Aldabbagh Fawaz,
Zetterlund Per B.,
Okubo Masayoshi
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700271
Subject(s) - nitroxide mediated radical polymerization , polymerization , precipitation polymerization , chain transfer , supercritical carbon dioxide , styrene , polymer chemistry , radical polymerization , supercritical fluid , precipitation , polymer , chemistry , living free radical polymerization , organic chemistry , copolymer , physics , meteorology
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.