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Alkyne liquid crystal compound, preparation method, composition containing compound and high-frequency assembly containing liquid crystal medium

A liquid crystal compound and liquid crystal composition technology, applied in chemical instruments and methods, liquid crystal materials, etc., to achieve the effects of low dielectric loss, wide nematic phase temperature range, and short synthesis steps

Active Publication Date: 2018-09-11
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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  • Alkyne liquid crystal compound, preparation method, composition containing compound and high-frequency assembly containing liquid crystal medium
  • Alkyne liquid crystal compound, preparation method, composition containing compound and high-frequency assembly containing liquid crystal medium
  • Alkyne liquid crystal compound, preparation method, composition containing compound and high-frequency assembly containing 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, in the there-necked flask, add 1-bromo-4-iodo-2-methylbenzene (20g, 0.067mol), bis(triphenylphosphine) palladium dichloride (0.48g, 1% mol), iodine Cuprous (0.38g, 3%mol), PPh 3 (0.54 g, 3% mol), triethylamine 250 mL. Propylphenylacetylene (9.7 g, 0.067 mol) was added dropwise at 10° C., and the reaction was incubated for 2 h for post-treatment. Filter the reaction solution, add n-heptane to dissolve the filtrate after rotary evaporation, wash with water until neutral, filter after drying with anhydrous magnesium sulfate, perform column chromatography on the filtrate, and recrystallize the eluate after rotary evaporation to obtain 15.7 g of solid, GC purity 99.49...

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] Use propylbenzene boronic acid to replace the ethyl benzene boronic acid in Example 1 step (2), adopt the same method as Example 1 to synthesize 2-methyl-4'-propyl-4-((4-propylbenzene Synthesis of yl)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] Using butylbenzene boronic acid to replace the ethyl benzene boronic acid in the step (2) of Example 1, 4'-butyl-2-methyl-4-((4-propylbenzene was synthesized by the same method as in Example 1) 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 acetylene liquid crystal compound, a preparation method and a composition thereof, and a high-frequency component comprising the liquid crystal medium, and is mainly suitable for filters, adjustable frequency selection surfaces, phase shifters, phase shifters, etc. Array radar, satellite navigation and 5G communication network and other fields. Background technique [0002] In recent years, the application of liquid crystal materials with low dielectric loss and high dielectric tuning rate in liquid crystal microwave device technologies such as filters, tunable frequency selective surfaces, phase shifters, phased array radars, 5G communication networks, etc. attention. As the core tuning material of microwave devices, the dielectric tuning rate of liquid crystal material determines the tuning capability of microwave devices. For liquid crystal ma...

Claims

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Application Information

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Patent Type & Authority Applications(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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