ZHANG Ran;PENG Zeng-hui;LIU Yong-gang;XUAN Li;ZHANG Zhi-yong. Synthesis and Properties of High Birefringence and Low Viscosity Liquid Crystal[J]. 液晶与显示, 2009,24(6): 789-793
ZHANG Ran;PENG Zeng-hui;LIU Yong-gang;XUAN Li;ZHANG Zhi-yong. Synthesis and Properties of High Birefringence and Low Viscosity Liquid Crystal[J]. 液晶与显示, 2009,24(6): 789-793DOI:
A group of liquid crystal (LC) single compounds with low polar or fluorine substitutes
which employee tolane as their mesogenic core
were synthesized and mixed with commercial liquid crystal mixture (10% by weight). Then
parallel-aligned liquid crystal cells were made with these mixtures. The viscosities of these mixtures were measured by rotational viscometer respectively. And the birefringence (n
)
of these LC cells were measured by spectroscopic ellipsometer at 633 nm. The n of each LC single compound was extrapolated
the results show a reasonable correlation with that calculated by Vuks equation. These tolane-type liquid crystals have remarkable higher n than the biphenyl compounds
and relative low viscosity
so should be suitable for the applications that require high speed response.
关键词
Keywords
references
. Demus D, Goodbye J W, Gray G W, et al. Handbook of Liquid Crystals [M]. Chichester:Wiley-VCH, 1998.
. Klasen M, Bremer M, Gtz A, et al. Calculation of optical and dielectric anisotropy of nematic liquid crystals [J]. Jpn. J. Appl. Phys., 1998, 37(8A):945-948.
. Pauluth D, Tarumi K. Advanced liquid crystals for television [J]. J. Mater. Chem., 2004, 14: 1219-1227.