含氟三联苯类异硫氰酸酯类液晶合成与微波性能研究

兰庚; 曹秋豪; 欧阳慧琦; 张智勇; 汪相如; 高时汉

doi:10.37188/CJLCD.2021-0146

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含氟三联苯类异硫氰酸酯类液晶合成与微波性能研究

材料物理 | 更新时间：2021-09-10

- 含氟三联苯类异硫氰酸酯类液晶合成与微波性能研究
- Synthesis and microwave properties of fluorinated terphenyl isothiocyanate liquid crystals
- 液晶与显示 2021年36卷第9期页码：1214-1224
- 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：
  
  [ "兰庚(1998-), 男, 湖北恩施人, 硕士研究生, 2020年于武汉轻工大学获学士学位, 主要从事液晶材料合成与性能方面的研究。E-mail: LG980430@126.com" ]
  [ "张智勇(1962-), 男, 湖北武汉人, 硕士, 教授, 1992年于南京大学获得硕士学位, 主要从事液晶材料的合成与性能方面的研究。E-mail: zzy6211@162.com" ]
  [ "高时汉(1965-), 男, 安徽安庆人, 硕士, 高级工程师, 1993年于华中科技大学获得硕士学位, 主要从事卫星通信系统设计方面的研究。E-mail: sh.gao@haige.com" ]
- 基金信息：
  
  国家装发部预研基金(61409230701)
- DOI：10.37188/CJLCD.2021-0146
  中图分类号： O753.2;O69;O621.2
- 收稿日期：2021-05-24，
  
  修回日期：2021-07-07，
  
  纸质出版日期：2021-09
- 稿件说明：
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兰庚, 曹秋豪, 欧阳慧琦, 等. 含氟三联苯类异硫氰酸酯类液晶合成与微波性能研究[J]. 液晶与显示, 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.
兰庚, 曹秋豪, 欧阳慧琦, 等. 含氟三联苯类异硫氰酸酯类液晶合成与微波性能研究[J]. 液晶与显示, 2021,36(9):1214-1224. DOI： 10.37188/CJLCD.2021-0146.

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（

=2~5），通过IR、

H NMR、

C NMR、

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

）为0.95，最大介电损耗为（tan

δε

r-max

）0.007 63，相位调制系数（

）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 (

=2~5) were synthesized by coupling method

and the structure of the compounds was confirmed to be correct by IR

H NMR

C NMR

and

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

) is 0.95

the dielectric loss (tan

δε

r-max

) 0.007 63

dieletric tunability coefficient (

) 0.265

which can satisfy the performance requirements of nematic liquid crystal materials for microwave use.

关键词

Keywords

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