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A liquid crystal compound and compound technology, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve problems such as low viscosity, and achieve the effects of mild reaction, low production cost, and high yield
Active Publication Date: 2016-04-13
JIANGSU HECHENG ADVANCED MATERIALS
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Although there have been many reports on liquid crystal materials, not all of them are suitable for use in displays, because liquid crystal materials for display must meet a wide operating temperature range, low operating voltage, low viscosity, fast response, high Stability and other requirements
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Embodiment 1
[0030] 1) Preparation of Compound 2
[0031]
[0032] Weigh 9.5g of the compound of formula 1, 8g of 1-bromo-3-fluoro-4-iodobenzene, 0.6g of tetrakis-triphenylphosphopalladium, weigh 100mL of DME (dimethyl ether), and 27g of potassiumcarbonateaqueous solution (2mol / L) , All the above materials were added into a 250mL single-necked bottle, replaced with nitrogen 5 times, and reacted at 60°C for 10h, TLC showed that there was still a small amount of raw materials.
[0060] Application of compound Ⅰ in liquid crystal materials
[0061] The liquid crystal monomers used in the following compositions can be purchased from the market. Unless otherwise specified, the contents of each component in the examples represent mass percentages.
[0062] The abbreviated code names of each test item in the following embodiments are as follows:
[0063] Cp (°C): clearing point (nematic-isotropic phase transition temperature)
[0067] t -30℃ : Low temperature storage time (at -30°C)
[0068] The following liquid crystal compounds are taken by weight and formulated into a liquid crystal composition. The specific proportions and the performance parameters of the obtained liquid crystal composition are shown in the table below, and the specific test methods for each relevant performance are ...
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Abstract
The invention provides a liquid crystal compound containing terminal difluoroethylene group, a preparation method and an application thereof, wherein the liquid crystal compound has a structure represented as the formula I as follows. The liquid crystal compound is stable in structure and properties, is good in intersolubility, is low in viscosity, is large in dielectricanisotropy and is high in refractive index. The liquid crystal compound, when being used in a liquid crystal composition, can enhance or improve comprehensive performances of the liquid crystal composition.
Description
technical field [0001] The invention relates to the field of liquid crystal compounds and their applications, in particular to a liquid crystal compound containing a terminal difluoroethylene group and its preparation method and application. Background technique [0002] In recent years, liquid crystal compounds and liquid crystal materials have become one of the hotspots in the research of applied chemistry and material chemistry, and have been widely used in various fields such as electronics, optics, acoustics, bioengineering, and chemical industry. The most important is its application in electronic display. With the development of the information industry, the requirements for liquid crystal materials are constantly increasing. Although there have been many reports on liquid crystal materials, not all of them are suitable for use in displays, because liquid crystal materials for display must meet a wide operating temperature range, low operating voltage, low viscosity,...
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