High birefringence lateral difluoro phenyl tolane liquid crystals

Qiong Song, Sebastian Gauza, Haiqing Xianyu, Shin Tson Wu, Yung Ming Liao, Chin Yen Chang, Chain-Shu Hsu

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Four laterally difluorinated phenyl tolane liquid crystals were synthesised and their physical properties evaluated. These compounds exhibit a fairly small heat fusion enthalpy (ΔH ~ 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 negativemixture N1 andmeasured 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.

Original languageEnglish
Pages (from-to)139-147
Number of pages9
JournalLiquid Crystals
Volume37
Issue number2
DOIs
StatePublished - 1 Feb 2010

Keywords

  • High birefringence
  • Liquid crystals
  • Negative dielectric anisotropy

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