Journal
LIQUID CRYSTALS
Volume 37, Issue 2, Pages 139-147Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678290903419079
Keywords
high birefringence; negative dielectric anisotropy; liquid crystals
Funding
- Air Force Office of Scientific Research (AFOSR) [FA95550-09-1-0170]
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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.
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