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Synthesis and microwave properties of fluorinated terphenyl isothiocyanate liquid crystals
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 9, Pages: 1214-1224(2021)
- 作者机构：
1.武汉轻工大学 化学与环境工程学院, 湖北 武汉 430023
2.电子科技大学 光电科学与工程学院, 四川 成都 611730
3.广州海格通信集团股份有限公司, 广东 广州 510663
- 作者简介：
- 基金信息：Supported by National Equipment Development Department Pre-research Fund Project of China(61409230701)
DOI：10.37188/CJLCD.2021-0146
CLC： O753.2;O69;O621.2Received：24 May 2021，
Revised：07 July 2021，
Published：2021-09
- 稿件说明：
移动端阅览
Geng LAN, Qiu-hao CAO, Hui-qi OUYANG, et al. Synthesis and microwave properties of fluorinated terphenyl isothiocyanate liquid crystals[J]. Chinese journal of liquid crystals and displays, 2021, 36(9): 1214-1224.
Geng LAN, Qiu-hao CAO, Hui-qi OUYANG, et al. Synthesis and microwave properties of fluorinated terphenyl isothiocyanate liquid crystals[J]. Chinese journal of liquid crystals and displays, 2021, 36(9): 1214-1224. DOI： 10.37188/CJLCD.2021-0146.
摘要
近年来液晶在微波通信器件上的研究发展迅速，而液晶材料的介电损耗成为制约其发展的主要因素。异硫氰三联苯类化合物是一种结构稳定的低粘度、高双折射率液晶化合物，适于作为微波用液晶材料组分。本文通过偶联法合成了4种含氟三联苯异硫氰酸酯液晶化合物nPGUS（
n
=2~5），通过IR、
1
H NMR、
13
C NMR、
19
F NMR确认化合物结构正确；差热分析（DSC）结果显示，它们都具有宽温向列相液晶态和相对较低的熔点，其中5PGUS的向列相温度范围达到101.8 ℃，熔点只有57.4 ℃；通过矩形谐振腔微扰法测试分析了它们在高频下的介电性能，将它们与母体液晶混合后，在18 GHz时的介电常数值（Δ
ε
r
）为0.95，最大介电损耗为（tan
δε
r-max
）0.007 63，相位调制系数（
τ
）0.265，可满足微波用向列相液晶材料性能要求。
Abstract
In recent years
the research of liquid crystal in microwave communication devices has developed rapidly
and the dielectric loss of liquid crystal materials has become the main factor restricting its development. The isothiocyanate terphenyl compound is a low-viscosity
high-birefringence liquid crystal compound with stable structure
which is suitable as a component of liquid crystal material for microwave. In this paper
four fluorine-containing terphenyl isothiocyanate liquid crystal compounds nPGUS (
n
=2~5) were synthesized by coupling method
and the structure of the compounds was confirmed to be correct by IR
1
H NMR
13
C NMR
and
19
F NMR. Differential thermal analysis (DSC) results show that they all have a wide-temperature nematic liquid crystal state and a relatively low melting point. The nematic temperature range of 5PGUS reaches 101.8 ℃
and the melting point is only 57.4 ℃. Their dielectric properties of LC in the microwave K bands were tested by the vector network analyzer
and they are mixed with the matrix liquid crystal
the dielectric constant value at 18 GHz (Δ
ε
r
) is 0.95
the dielectric loss (tan
δε
r-max
) 0.007 63
dieletric tunability coefficient (
τ
) 0.265
which can satisfy the performance requirements of nematic liquid crystal materials for microwave use.
关键词
Keywords
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