Synthesis of diphenyl-diacetylene-based nematic liquid crystals and their high birefringence properties
Synthesis of diphenyl-diacetylene-based nematic liquid crystals and their high birefringence properties
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二苯基二乙炔基向列型液晶的合成及其高双折射性能
DOI：
10.1039/c2jm16002a
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发表时间：
2012
影响因子：
--
通讯作者：
J. Watanabe
中科院分区：
文献类型：
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作者：
Y. Arakawa;Shunpei Nakajima;R. Ishige;Makoto Uchimura;Sungmin Kang;G. Konishi;J. Watanabe
我们合成了两种长度为m的烷氧基和烷基基二乙炔（DPDA）基材料（分别为DPDA - ocm和DPDA - cm），并测量了它们的向列相双折射率（Δn）随波长和温度的变化。我们发现Δn随着m的增加而减小，可能是由于低-Δn烷基尾的稀释效应。此外，在这两个系列中，Δn在DPDA-OCm材料中相对较高，DPDA-OC1在550 nm、低于各向同性向列转变温度10°C下获得的最大值为0.4。此外，我们观察到Δn的温度依赖性，它与序参数(s)成正比。从外推到s = 1（完美的取向状态），可以推测DPDA-O部分具有提供0.9的非常大的Δn的潜力。
We synthesized two series of diphenyl-diacetylene (DPDA)-based materials with alkoxy and alkyl tails of length m (DPDA–OCm and DPDA–Cm, respectively), and measured their nematic-phase birefringence (Δn) as a function of wavelength and temperature. We found that Δn decreases with an increase in m, possibly by a dilution effect of the low-Δn alkyl tail. Further, of the two series, Δn was found to be relatively higher in the DPDA–OCm materials, with the highest value of 0.4 obtained for DPDA–OC1 at 550 nm at 10 °C below the isotropic-to-nematic transition temperature. Further, we observed the temperature dependence for Δn, which is proportional to the order parameter (s). From extrapolation to s = 1 (the perfect orientation state), it is speculated that the DPDA–O moiety has the potential to afford a very large Δn of 0.9.