A kind of acetylene liquid crystal compound, preparation method and composition containing this compound and high frequency component containing this liquid crystal medium

A technology of liquid crystal compounds and liquid crystal compositions, applied in chemical instruments and methods, liquid crystal materials, etc., to achieve the effects of wide nematic phase temperature range, easy operation, and improved performance of high-frequency components

Active Publication Date: 2020-02-14
XIAN MODERN CHEM RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the journal "Proc.of SPIE, 2013, 8642: 86420S-1-86420S-6", a paper entitled "Liquid Crystals for Microwave Applications" also reported a mixed liquid crystal material based on a fluorine-containing phenyl tolant liquid crystal compound Compared with traditional cyano-based liquid crystal materials, although the dielectric tuning rate and dielectric loss have been improved to a certain extent, the overall performance is still at a moderate level and needs to be further improved.

Method used

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  • A kind of acetylene liquid crystal compound, preparation method and composition containing this compound and high frequency component containing this liquid crystal medium
  • A kind of acetylene liquid crystal compound, preparation method and composition containing this compound and high frequency component containing this liquid crystal medium
  • A kind of acetylene liquid crystal compound, preparation method and composition containing this compound and high frequency component containing this liquid crystal medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Synthesis of 4'-ethyl-2-methyl-4-((4-propylphenyl)ethynyl)-1,1'-biphenyl

[0037] The specific structure is as follows:

[0038]

[0039] The preparation process is as follows:

[0040] Step 1: Synthesis of 1-bromo-2-methyl-4-((4-propylphenyl)ethynyl)benzene

[0041]

[0042] Under nitrogen protection, 1-bromo-4-iodo-2-methylbenzene (20g, 0.067mol), bis(triphenylphosphine)palladium dichloride (0.48g, 1%mol), iodine Cuprous chloride (0.38g, 3%mol), PPh 3 (0.54g, 3%mol), triethylamine 250mL. Propylphenylacetylene (9.7 g, 0.067 mol) was added dropwise at 10°C, and the reaction was kept for 2 hours for post-treatment. Filter the reaction solution, add n-heptane to dissolve the filtrate after rotary evaporation, wash with water until neutral, dry over anhydrous magnesium sulfate and filter, perform column chromatography on the filtrate, and recrystallize the eluent after rotary evaporation to obtain 15.7g solid, GC purity 99.49%.

[0043] Step 2: Synthesis of 4'-et...

Embodiment 2

[0051] Synthesis of 2-methyl-4'-propyl-4-((4-propylphenyl)ethynyl)-1,1'-biphenyl

[0052] The specific structure is as follows:

[0053]

[0054] Using propylphenylboronic acid to replace the ethylbenzeneboronic acid in the step (2) of Example 1, the same method as in Example 1 was used to synthesize 2-methyl-4'-propyl-4-((4-propylbenzene Synthesis of ethynyl)-1,1'-biphenyl.

Embodiment 3

[0056] Synthesis of 4'-butyl-2-methyl-4-((4-propylphenyl)ethynyl)-1,1'-biphenyl

[0057] The specific structure is as follows:

[0058]

[0059] Adopt butylphenylboronic acid to replace the ethylbenzeneboronic acid in embodiment 1 step (2), adopt the same method as embodiment 1 to synthesize 4'-butyl-2-methyl-4-((4-propylbenzene yl)ethynyl)-1,1'-biphenyl.

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Abstract

The invention discloses an alkyne liquid crystal compound, a preparation method, a composition containing the compound and a high-frequency assembly containing a liquid crystal medium in order to solve the problem that the comprehensive performance of the prior art is poor. The structure of the liquid crystal compound is shown in the description, and the liquid crystal composition includes a firstcompound the content of which is lower than or equal to 80% and higher than 0, a second compound the content of which is higher than 0 and lower than or equal to 65% and a third compound the contentof which is higher than 0 and lower than or equal to 60%. The liquid crystal compound has the advantages of low dielectric loss, high quality factors and a wide nematic phase temperature interval andis applicable to filters, phase shifters, phase-controlled array radars, 5G communication networks and other fields. The liquid crystal high-frequency assembly has a wide working temperature range, low loss and high tunability.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and in particular relates to an alkyne liquid crystal compound, a preparation method and a composition thereof, and a high-frequency component containing the liquid crystal medium, and is mainly applicable to filters, adjustable frequency selective surfaces, phase shifters, and phase shifters. Array control radar, satellite navigation and 5G communication network and other fields. Background technique [0002] In recent years, liquid crystal materials with low dielectric loss and high dielectric tuning rate have been widely used in liquid crystal microwave device technologies such as filters, adjustable frequency selective surfaces, phase shifters, phased array radars, and 5G communication networks. attention. As the core tuning material of microwave devices, the dielectric tuning rate of liquid crystal materials determines the tuning ability of microwave devices. For liquid cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/18C09K19/44
CPCC09K19/18C09K19/44C09K2019/183
Inventor 李娟利李建车昭毅杨晓哲莫玲超安忠维张璐胡明刚陈小川朱红赵伟利刘明星李锐孙海雁于美娜
Owner XIAN MODERN CHEM RES INST
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