Title

High birefringence lateral difluoro phenyl tolane liquid crystals

Authors

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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