High birefringence lateral difluoro phenyl tolane liquid crystals
Abbreviated Journal Title
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
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.
"High birefringence lateral difluoro phenyl tolane liquid crystals" (2010). Faculty Bibliography 2010s. 815.