Linear and star‐shaped POSS hybrid materials containing crystalline isotactic polystyrene chains |
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| Authors: | Maximilian Vielhauer Pierre J Lutz Günter Reiter Rolf Mülhaupt |
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| Institution: | 1. Freiburg Materials Research Center (FMF) and Institute for Macromolecular Chemistry, Albert‐Ludwigs‐Universit?t Freiburg i.Br., Stefan‐Meier‐Stra?e 21, D‐79104 Freiburg, Germany;2. Institut Charles Sadron, CNRS UPR 22, University of Strasbourg, 23, rue de Loess, 67034 Strasbourg, France;3. Physikalisches Institut, Albert‐Ludwigs‐Universit?t Freiburg i.Br., Hermann‐Herderstra?e 3, 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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| Keywords: | catalysis crystallization inorganic– organic hybrid materials isotactic polystyrene silsesquioxane |
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