侧位含氟苯乙炔类液晶化合物的微波介电性能

李诗妍; 王婵; 关金涛; 张智勇; 汪相如; 高时汉

doi:10.37188/CJLCD.2021-0025

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侧位含氟苯乙炔类液晶化合物的微波介电性能

材料物理 | 更新时间：2021-07-13

- 侧位含氟苯乙炔类液晶化合物的微波介电性能
- Microwave dielectric properties of fluorine substituted phenylacetylene liquid crystal compounds
- 液晶与显示 2021年36卷第7期页码：913-920
- 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：
  
  [ "李诗妍(1996-)，女，湖北武汉人，硕士研究生，2018年于武汉轻工大学获得学士学位，主要从事液晶材料合成与性能方面的研究。E-mail: lishiyan313@163.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.2021-0025
  中图分类号： O69;O621.2
- 收稿日期：2021-03-03，
  
  修回日期：2021-03-14，
  
  纸质出版日期：2021-07
- 稿件说明：
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李诗妍, 王婵, 关金涛, 等. 侧位含氟苯乙炔类液晶化合物的微波介电性能[J]. 液晶与显示, 2021,36(7):913-920.

Shi-yan LI, Chan WANG, Jin-tao GUAN, et al. Microwave dielectric properties of fluorine substituted phenylacetylene liquid crystal compounds[J]. Chinese journal of liquid crystals and displays, 2021, 36(7): 913-920.
李诗妍, 王婵, 关金涛, 等. 侧位含氟苯乙炔类液晶化合物的微波介电性能[J]. 液晶与显示, 2021,36(7):913-920. DOI： 10.37188/CJLCD.2021-0025.

Shi-yan LI, Chan WANG, Jin-tao GUAN, et al. Microwave dielectric properties of fluorine substituted phenylacetylene liquid crystal compounds[J]. Chinese journal of liquid crystals and displays, 2021, 36(7): 913-920. DOI： 10.37188/CJLCD.2021-0025.

摘要

近年来基于液晶材料的微波通信器件研究发展迅速，液晶材料的介电损耗成为制约微波器件发展的瓶颈，然而目前对微波用液晶材料性能报道较少。本文以低熔点高双折射侧位含氟苯乙炔类液晶作为研究对象，将其按一定比例掺杂到母体液晶MA中，采用矩形谐振腔微扰法测试所选液晶化合物在微波频段(10~30 GHz)下的介电性能，探讨分子结构对微波频段液晶介电性能的影响作用。实验结果表明：在高频时的液晶介电各向异性与分子极性和双折射率相关，侧位含氟苯乙炔类和端基异硫氰基苯乙炔类液晶化合物均具有较大的介电各向异性(Δ

0.85)；对于具有较高双折射率的对称含氟三苯二炔类和三苯乙炔异硫氰基类液晶化合物表现出较低的介电损耗(tan

δε

r⊥

8.0×10

-3

，18 GHz)，而异硫氰基的含氟二苯乙炔类和不对称含氟三苯二炔类液晶化合物则表现出较高的介电损耗(tan

δε

r⊥

8.0×10

-3

，18 GHz)。

Abstract

In recent years

the research of liquid crystal microwave communication devices has developed rapidly. The high dielectric loss of liquid crystal materials has become a bottleneck restricting the development of microwave devices. There are few reports on the properties of liquid crystal materials at microwaves. Therefore

we take the fluorine substituted tolane-type compounds with low melting point and high birefringence as the research object

doping them into the liquid crystal matrix MA in a certain proportion respectively

and testing them at microwave k-band (10~30 GHz) through the rectangular cavity perturbation method. And then

the influence of molecular structure on the dielectric properties of liquid crystals at microwave frequency is discussed.The experimental results show that dielectric anisotropy at high-frequency is related to the polarity of liquid crystal molecules and birefringence. The lateral fluorophenyl phenylacetylene and terminal isothiocyano phenylacetylene liquid crystal compounds exhibit high dielectric anisotropy(Δ

0.85). Triphenyl diacetylenes substituted by F-atom symmetrically and triphenyl acetylene liquid crystal compounds with terminal isothiocyanate exhibit lower dielectric loss(tan

δε

r⊥

0.008

18 GHz) due to higher birefringence. Fluorinated diphenylacetylenes with terminal isothiocyanates and triphenyldiyne substituted with fluorine asymmetrically liquid crystal compounds show higher dielectric loss(tan

δε

r⊥

0.008

18 GHz).

关键词

Keywords

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