Nitroxide-Mediated Radical Dispersion Polymerization of Styrene in Supercritical Carbon Dioxide Using a Poly(dimethylsiloxane-block-styrene) Alkoxyamine as Initiator and Stabilizer

Authors

  • Ronan McHale,

    1. Department of Chemistry, National University of Ireland, Galway, Ireland
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  • Fawaz Aldabbagh,

    Corresponding author
    1. Department of Chemistry, National University of Ireland, Galway, Ireland
    • Department of Chemistry, National University of Ireland, Galway, Ireland. Fax: (+353) 91525700
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  • Per B. Zetterlund,

    1. Department of Chemical Science and Engineering, Faculty of Engineering, Kobe University, Kobe 657-8501, Japan
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  • Masayoshi Okubo

    Corresponding author
    1. Department of Chemical Science and Engineering, Faculty of Engineering, Kobe University, Kobe 657-8501, Japan
    2. Graduate School of Science and Technology, Kobe University, Kobe 657-8501, Japan
    • Graduate School of Science and Technology, Kobe University, Kobe 657-8501, Japan. Fax: (+81) (0)78 8036161
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Abstract

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.

original image

TEM micrograph of PS particles prepared in the dispersion polymerization of S in scCO2 in the presence of PDMS(\overline M _{\rm n} = 6 500)-b-PS(\overline M _{\rm n} = 4 500)-SG1 at 110 °C.

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