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Effect of fluorination of molecular rigid core in liquid crystal biphenyl benzoate based homologous series

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EN
Liquid crystalline perfluorinated biphenyl benzoates were synthesized and investigated. A highly tilted, neat orthoconic smectic antiferroelectric phase was observed. A homologous series of compounds without and with a single fluorine atom substituted at different positions of a molecular rigid core was investigated by standard methods. Influence of fluorine substitution on physical properties of antiferroelectric smectic phase was discussed as well as influence of fluorination on molecular dipole moment orientation and its value were presented. Decrease in rotational viscosity as a result of fluorine substitution within a molecular rigid core was ascribed to changes of molecular packing.
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  • Institute of Applied Physics, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland
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Bibliografia
  • [1] K. D'have, A. Dahlgren, P. Rudquist, J.P.F. Lagerwall, G. Anderson, M. Matuszczyk, S.T. Lagerwall, R. Dąbrowski, and W. Drzewiński: Antiferroelectric liquid crystals with 45° tilt a new class of promising electro-optic materials. Ferroelectrics 244, 115-128, 2000.
  • [2] K. D'have, P. Rudquist, S.T. Lagerwall, H. Pauwels, W. Drzewiński, and R. Dąbrowski: Solution of the dark state problem in antiferroelectric liquid crystal displays. Appl. Phys. Lett. 76, 3528-3530, 2000.
  • [3] R. Dąbrowski, J. Gąsowska, J.M. Otón, W. Piecek, J. Przedmojski, and M. Tykarska: High tilted antiferroelectric liquid crystalline materials. Displays 25, 9-19, 2004.
  • [4] M. Żurowska, R. Dąbrowski, J. Dziaduszek, K. Czupryński, K. Skrzypek, M. Filipowicz, N. Bennis, and J.M. Otón: Synthesis and properties of high tilted antiferroelectric esters with partially fluorinated alkoxyalkoxy terminal chains. Opto-Electron. Rev. 16, 251-256, 2008.
  • [5] W. Piecek, Z. Raszewski, P. Perkowski, J. Kędzierski, J. Rutkowska, J. Zieliński, R. Dąbrowski, and X.W. Sun: On the importance of the molecular core interactions on the induction of the high optical tilt angle. Mol. Cryst. Liq. Cryst. 477, 205-221, 2007.
  • [6] W. Piecek, Z. Raszewski, P. Perkowski, J. Kędzierski, J. Rutkowska, J. Zieliński, E. Nowinowski-Kruszelnicki, and J. Przedmojski: The origin of high optical tilt in a homologous series of fluorinated antiferroelectric liquid crystals. Mol. Cryst. Liq. Cryst. 436, 1103-1165, 2005.
  • [7] W. Piecek, P. Perkowski, Z. Raszewski, J. Kędzierski, J. Przedmojski, V. Bastys, A. Lara Madrigal, R. Dąbrowski, and J. Zieliński: A homologous series of fluorinated anti-ferroelectric liquid crystals - a comparaive study of physical properties and the electrooptical performance. SPIE Proc. 5565, 106-110, 2004.
  • [8] K. Skarp: Rotational viscosities in ferroelectric smectic liquid crystals. Ferroelectrics 84, 119-142, 1988.
  • [9] R. Dąbrowski: Liquid crystals with fluorinated terminal chains and antiferroelectric properties. Ferroelectrics 243, 1-18, 2000.
  • [10] W. Piecek, P. Kula, Z. Raszewski, P. Perkowski, P. Morawiak, J. Kędzierski, R. Dąbrowski, and X.W. Sun: An influence of a single fluorine atom position in the molecular rigid core on physical properties of orthoconic antiferroelectric liquid crystal. Ferroelectrics 365, 701-711, 2008.
  • [11] J.W. Choi and Y.B. Kim: Effect of the position of fluorine substituent introduced into the benzene ing system on the electro-optical properties of phenylbiphenyl carboxylate series of AFLCS. Ferroelectrics 276, 13-28, 2002.
  • [12] F. Guittard, T.D. Givenchy, S. Geribaldi, and A. Cambon: Highly fluorinated thermotropic liquid crystals: an update. J. Fluorine Chem. 100, 85-96, 1999.
  • [13] M. Hird and K.J. Toyne: Fluoro substitution in thermotropic liquid crystals. Mol. Cryst. Liq. Cryst. 323, 167, 1998.
  • [14] S.L. Wu and C.Y. Lin: Effect of the semi-fluorinated chiral alkane on the formation of the antiferroelectric phase. Liq. Cryst. 33, 495-502, 2006.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWAD-0016-0019
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