Browsing by Author "Song, Qiong"

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High birefringence lateral difluoro phenyl tolane liquid crystals
(2010)
Song, Qiong
;
Gauza, Sebastian
;
Xianyu, Haiqing
;
Wu, Shin Tson
;
Liao, Yung-Ming
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.