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Nitroxide‐Mediated Radical Dispersion Polymerization of Styrene in Supercritical Carbon Dioxide Using a Poly(dimethylsiloxane‐ block ‐styrene) Alkoxyamine as Initiator and Stabilizer
Author(s) -
McHale Ronan,
Aldabbagh Fawaz,
Zetterlund Per B.,
Okubo Masayoshi
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600383
Subject(s) - dispersion polymerization , nitroxide mediated radical polymerization , supercritical carbon dioxide , polymer chemistry , polymerization , styrene , materials science , dispersity , radical polymerization , polystyrene , polymer , dispersion (optics) , copolymer , supercritical fluid , chemistry , organic chemistry , composite material , physics , optics
Summary: Nitroxide‐mediated dispersion polymerization of styrene in supercritical carbon dioxide has been performed successfully at 110 °C using a new polymeric so‐called inistab species, which fulfils the dual functions of an initiator and a colloidal stabilizer. The inistab species comprised a poly(dimethylsiloxane) block and a polystyrene block end‐capped with the nitroxide N ‐ tert ‐ N‐ butyl‐ N ‐[1‐diethylphosphono‐(2,2‐dimethylpropyl)] nitroxide (SG1). The dispersion polymerization resulted in sub‐micron sized polymer particles and polymers of narrow polydispersity.TEM micrograph of PS particles prepared in the dispersion polymerization of S in scCO 2 in the presence of PDMS( \overline M _{\rm n} = 6 500)‐ b ‐PS( \overline M _{\rm n} = 4 500)‐SG1 at 110 °C.