標題: Synthesis of fluorinated terphenyl liquid crystals with 3-propylcyclopentane end group
作者: Lee, Tien-Hsin
Hsu, Chain-Shu
應用化學系
Department of Applied Chemistry
關鍵字: terphenyl liquid crystals;cyclopentyl end group;fluoro substituent;birefringence
公開日期: 1-Jan-2014
摘要: High performance liquid crystal (LC) displays require nematic mixtures with low rotational viscosity to reduce the response time and large dielectric anisotropy to reduce the threshold voltage. Furthermore, liquid crystals (LCs) with low melting temperature and high clearing temperature are particularly attractive for automobile and outdoor display applications. In this article, we report a series of new fluorinated terphenyl LCs with 3-alkylcyclopentane end group. The terphenyl mesogen is designed for high Delta n value, and the lateral fluorine atom is used to reduce the melting temperature. In comparison with the terphenyl analogue containing a 4-alkylcyclohexyl end group, discussed in previous works, the obtained LCs show wider nematic temperature range and smaller rotational viscosity because 3-alkylcyclopentyl moiety is introduced. The effect of alkyl chain length and the lateral fluoro substituent on the mesomorphic properties of the obtained LC is discussed. The results show that the nematic temperature range increases with the alkyl chain length increase. The position of the lateral fluoro substituent also plays an important role; LC with the fluoro substitution on the central benzene ring provides the widest nematic temperature range. In conclusion, we have synthesised a new series of LCs with low melting point, wider nematic temperature range and high Delta n value, which is promising in formulating eutectic mixture for display application.
URI: http://dx.doi.org/10.1080/02678292.2014.913720
http://hdl.handle.net/11536/24977
ISSN: 0267-8292
DOI: 10.1080/02678292.2014.913720
期刊: LIQUID CRYSTALS
Volume: 41
Issue: 9
起始頁: 1235
結束頁: 1245
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