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Linear and star-shaped POSS hybrid materials containing crystalline isotactic polystyrene chains

Authors

  • Maximilian Vielhauer,

    1. Freiburg Materials Research Center (FMF) and Institute for Macromolecular Chemistry, Albert-Ludwigs-Universität Freiburg i.Br., Stefan-Meier-Straße 21, D-79104 Freiburg, Germany
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  • Pierre J. Lutz,

    1. Institut Charles Sadron, CNRS UPR 22, University of Strasbourg, 23, rue de Loess, 67034 Strasbourg, France
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  • Günter Reiter,

    1. Physikalisches Institut, Albert-Ludwigs-Universität Freiburg i.Br., Hermann-Herderstraße 3, D-79104 Freiburg, Germany
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  • Rolf Mülhaupt

    Corresponding author
    1. Freiburg Materials Research Center (FMF) and Institute for Macromolecular Chemistry, Albert-Ludwigs-Universität Freiburg i.Br., Stefan-Meier-Straße 21, D-79104 Freiburg, Germany
    • Freiburg Materials Research Center (FMF) and Institute for Macromolecular Chemistry, Albert-Ludwigs-Universität Freiburg i.Br., Stefan-Meier-Straße 21, D-79104 Freiburg, Germany
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Abstract

New crystalline nanostructured inorganic–organic hybrid materials containing isotactic polystyrene (iPS) are prepared by means of hydrosilylation coupling of vinyl-terminated iPS with octakis(dimethylsilyloxy)silsesquioxane (Q8M8H). The number average molar mass of the iPS chains varies between 2000 and 6000 g mol−1. As a function of the iPS/Q8M8H ratio, using excess reagent, the formation of linear or star-shaped hybrid architectures is achieved. Via fractionation, it is possible to isolate well-defined linear hybrids containing one iPS chain and seven ethyl groups per silica core (iPS-Q8M8E7) as well as star-shaped hybrids containing up to eight iPS side chains (iPS6-8-Q8M8). These new iPS/polyhedral oligomeric silsesquioxane hybrid materials crystallize when the number average molar mass of iPS side chain exceeds 5500 g mol−1. The hydrosilylation coupling reaction and the resulting linear iPS-Q8M8E7 and star-shaped iPS6-8-Q8M8 are characterized by NMR spectroscopy, size exclusion chromatography (gel permeation chromatography), and polarized light microscopy. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013

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