Liquid crystal compound and preparation method thereof, liquid crystal composition and microwave communication device

A technology for liquid crystal compounds and liquid crystal compositions, applied in chemical instruments and methods, liquid crystal materials, etc., can solve the problems of increasing the amount of microwave phase shift, insufficient phase shift amount, large dielectric loss of liquid crystal materials, etc. Effects of electrical loss, large optical anisotropy, and structural stability

Active Publication Date: 2019-04-26
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, based on the work of Kowerdziej R., Lapanik V. et al. used isothiocyanate-polyaromatic mixed liquid crystal materials, which not only reduced the dielectric loss, but also increased the amount of microwave phase shift, revealing the molecular structure The influence of the stability of groups and bridge bonds on dielectric loss, but the melting point of the material is still above 0°C, and it cannot meet the requirements of outdoor use.
However, there have been no reports on the influence of low-temperature photoelectric properties of liquid crystals for microwave use.
[0005] Further, in the process of a large number of existing researches, it is found that the current liquid crystal materials for microwave use mainly have the following problems in practical applications: ①The value of Δn is too small, resulting in insufficient phase shift; ②Due to the absorption of structural groups in liquid crystal molecules and It can be polarized, resulting in a large dielectric loss of liquid crystal materials; ③ lack of high Δn value, low melting point liquid crystal solvents and nematic liquid crystal components, resulting in affecting the low temperature performance of liquid crystal materials

Method used

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  • Liquid crystal compound and preparation method thereof, liquid crystal composition and microwave communication device
  • Liquid crystal compound and preparation method thereof, liquid crystal composition and microwave communication device
  • Liquid crystal compound and preparation method thereof, liquid crystal composition and microwave communication device

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preparation example Construction

[0058] figure 1 Shown is an example of the preparation method of the liquid crystal compound provided by the present invention. see figure 1 , in this embodiment, the preparation method of the liquid crystal compound comprises the following steps:

[0059] Step S10, under nitrogen protection, the first reactant, 2-ethyl-4-iodoaniline, palladium catalyst, K 2 CO 3 , ethanol, toluene and water were subjected to Suzuki coupling reaction under heating and stirring conditions for 3.5-4.5 hours, and then separated, washed, dried and purified to obtain the first intermediate;

[0060] The separation, washing, drying and purification in step S10 can be carried out according to conventional methods in the field of organic synthesis, such as separating the reaction product by centrifugation or filtration, then extracting with an organic solvent, washing with water, drying with a desiccant, and finally Through chromatography, elution, etc., the purified product is obtained. In this ...

Embodiment 1

[0090] The synthesis of embodiment 1 liquid crystal compound 5PP (2) GIP4, structural formula is:

[0091]

[0092] The preparation process is:

[0093] (1) Add 4-n-pentylphenylboronic acid (0.04mol, 7.68g), 2-ethyl-4-iodoaniline (0.04mol, 9.88g), K 2 CO 3 (0.10mol, 13.8g), ethanol 80mL, toluene 60mL and water 30mL, after nitrogen replacement 4 times, add catalyst tetrakistriphenylphosphine palladium (0.01mol, 0.46g), heat and stir and keep the liquid phase temperature at 70°C , stop stirring after reflux reaction for 4h, the reaction solution is naturally cooled to room temperature, then add hydrochloric acid to neutralize and filter to remove insoluble matter, then add toluene (3 × 50mL) to extract and separate the liquid, wash to neutrality, wash the product with anhydrous Na 2 SO 4 After drying and filtering, the filtrate was evaporated to dryness and loaded into a chromatography column, eluted with petroleum ether, and finally the solvent was removed by rotary evapo...

Embodiment 2

[0101] The synthesis of embodiment 2 liquid crystal compound 5PP (2) GIP5, structural formula is:

[0102]

[0103] The preparation process is:

[0104] (1) Add 4-n-pentylphenylboronic acid (0.08mol, 15.36g), 2-ethyl-4-iodoaniline (0.08mol, 19.76g), K 2 CO 3 (0.24mol, 33.12g), ethanol 100mL, toluene 60mL and water 35mL, nitrogen replacement 4 times, add catalyst tetraphenylphosphine palladium (0.01mol, 1.24g), heat and stir and keep the liquid phase temperature at 70°C , stop stirring after reflux reaction for 4h, the reaction solution is naturally cooled to room temperature, then add hydrochloric acid to neutralize and filter to remove insoluble matter, then add toluene (3 × 50mL) to extract and separate the liquid, wash to neutrality, wash the product with anhydrous Na 2 SO 4 After drying and filtering, the filtrate was evaporated to dryness and loaded into a chromatography column, eluted with petroleum ether, and finally the solvent was removed by rotary evaporation t...

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Abstract

The invention discloses a liquid crystal compound and a preparation method thereof, a liquid crystal composition and a microwave communication device. The liquid crystal compound has a structure as shown in a structural formula (I). A quaterphenyl structure is existent in the structure of the liquid crystal compound, so that the liquid crystal compound has the advantages of being large in opticalanisotropy and structure stability, and is in favor of reducing dielectric loss of the liquid crystal microwave device when being applied to high-dielectric anisotropy liquid crystal material, and thephase modulation capacity can be improved and the quality factor of the liquid crystal material can be increased.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a liquid crystal compound, a preparation method thereof, a liquid crystal composition and a microwave communication device. Background technique [0002] Currently, liquid crystals are widely used in displays, however, in some studies, liquid crystal media have also been suggested for use in components for microwave technology. The research on the use of liquid crystals in microwave devices began at the end of the last century and developed rapidly at the beginning of this century; especially in recent years, it has received widespread attention from all over the world and has developed rapidly. Research has found that it can be used for tuning filters, reconfigurable antennas, Important fields such as frequency selectors and adjustable phase shifters. For example, in 1993, Lim K.C. et al. used commercial liquid crystal K15 to obtain a 20° phase shift at a frequency of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/12C09K19/44
CPCC09K19/126C09K19/44
Inventor 张智勇陈婷欧阳慧琦关金涛汪相如乔俊飞张海燕蔡雄辉高时汉赵怿哲
Owner WUHAN POLYTECHNIC UNIVERSITY
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