Silicon-based and fluorinated polymeric surfactants for nitroxide mediated dispersion polymerization in supercritical carbon dioxide

D.G. Ramírez-Wong, C.A. Posada-Velez, E. Saldívar-Guerra, J.G. Luna-Bárcenas, C. Ott, U.S. Schubert

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15 Citaten (Scopus)
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Samenvatting

Block copolymers based on siloxanes and fluorinated block copolymers were synthesized and tested as surfactants for nitroxide mediated polymerizations (NMP) in supercritical carbon dioxide. Styrene was polymerized in the presence of TEMPO at 130 °C using various surfactants. Siloxane-based surfactants were synthesized by a new route based on NMP; the perfluorinated surfactants were also synthesized by NMP. The dispersion polymerizations of styrene in scCO2 reveal conversions of up to 35% in 4 hours at 19.1 MPa. The resulting polydispersity indices lie in the range 1.2-1.4. The best results are obtained using a perfluorinated surfactant. Preliminary copolymerization experiments of the polystyrene macroinitiator in scCO 2 have shown successful chain-extension with butyl acrylate (BuA) resulting in the formation of a poly (St-b-BuA) block copolymer.
Originele taal-2Engels
Pagina's (van-tot)120-129
TijdschriftMacromolecular Symposia
Volume283-284
Nummer van het tijdschriftNew Trends in Polymer Science
DOI's
StatusGepubliceerd - 2009

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