Main-Chain Liquid Crystalline Polymers Based on Bis-Etherified 9,9-Dihexyl-2,7-bis(4′-hydroxy-1,1′-biphen-4-yl)fluorenes

Authors

  • Tanja Sović,

    1. Institute for Chemistry and Technology of Organic Materials (ICTOS), Graz University of Technology, Stremayrgasse 16, 8010 Graz, Austria
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  • Stefan Kappaun,

    1. Institute for Chemistry and Technology of Organic Materials (ICTOS), Graz University of Technology, Stremayrgasse 16, 8010 Graz, Austria
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  • Andreas Koppitz,

    1. Institute for Chemistry and Technology of Organic Materials (ICTOS), Graz University of Technology, Stremayrgasse 16, 8010 Graz, Austria
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  • Egbert Zojer,

    1. Institute for Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
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  • Robert Saf,

    1. Institute for Chemistry and Technology of Organic Materials (ICTOS), Graz University of Technology, Stremayrgasse 16, 8010 Graz, Austria
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  • Karin Bartl,

    1. Institute for Chemistry and Technology of Organic Materials (ICTOS), Graz University of Technology, Stremayrgasse 16, 8010 Graz, Austria
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  • Katalin Fodor-Csorba,

    1. Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, 1525, Budapest, P. O. Box 49, Hungary
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  • Aniko Vajda,

    1. Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, 1525, Budapest, P. O. Box 49, Hungary
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  • Siegmar Diele,

    1. Institut für Physikalische Chemie, Martin-Luther-Universität Halle-Wittenberg, Mühlpforte 1, D-06108 Halle, Germany
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  • Gerhard Pelzl,

    1. Institut für Physikalische Chemie, Martin-Luther-Universität Halle-Wittenberg, Mühlpforte 1, D-06108 Halle, Germany
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  • Christian Slugovc,

    1. Institute for Chemistry and Technology of Organic Materials (ICTOS), Graz University of Technology, Stremayrgasse 16, 8010 Graz, Austria
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  • Franz Stelzer

    Corresponding author
    1. Institute for Chemistry and Technology of Organic Materials (ICTOS), Graz University of Technology, Stremayrgasse 16, 8010 Graz, Austria
    • Institute for Chemistry and Technology of Organic Materials (ICTOS), Graz University of Technology, Stremayrgasse 16, 8010 Graz, Austria. Fax: +43 316 873 8951
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Abstract

A series of liquid crystalline compounds based on 2,7-bis(biphenyl)fluorenes was synthesised by a Suzuki cross-coupling reaction and subsequent etherification with different bromoalkenes. By simple variations of the chain lengths the temperature range in which the nematic mesophase is present could be tuned. The described approach offers the possibility of covalent incorporation of the mesogens into polymers via olefin metathesis techniques, resulting in enlarged stability of the mesophase. Monomers and polymers could be easily aligned on rubbed polyimide substrates as revealed by polarised absorption spectroscopy.

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