High birefringence lateral difluoro phenyl tolane liquid crystals

    Authors

    Q. Song; S. Gauza; H. Q. Xianyu; S. T. Wu; Y. M. Liao; C. Y. Chang;C. S. Hsu

    Comments

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    Abbreviated Journal Title

    Liq. Cryst.

    Keywords

    high birefringence; negative dielectric anisotropy; liquid crystals; NEGATIVE DIELECTRIC ANISOTROPY; REFRACTIVE-INDEX DISPERSIONS; MESOMORPHIC PROPERTIES; DIPHENYL-DIACETYLENE; TRANSITION-TEMPERATURES; PHYSICAL-PROPERTIES; DERIVATIVES; Chemistry, Multidisciplinary; Crystallography; Materials Science, ; Multidisciplinary

    Abstract

    Four laterally difluorinated phenyl tolane liquid crystals were synthesised and their physical properties evaluated. These compounds exhibit a fairly small heat fusion enthalpy (Delta H similar to 12.56 kJ mol(-1)), which is favourable for mixture formulations. For comparison, four lateral difluoro cyclohexane tolane homologues are also studied. We doped 10 wt% of each compound into a commercial negative mixture N1 and measured the birefringence, visco-elastic coefficient and figure of merit. Birefringence varies very little between homologues, but the visco-elastic coefficient increases as alkyl chain length increases. The refractive indices of these guest-host mixtures at 1550 nm are also measured.

    Journal Title

    Liquid Crystals

    Volume

    37

    Issue/Number

    2

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    139

    Last Page

    147

    WOS Identifier

    WOS:000274446200003

    ISSN

    0267-8292

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