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Preparation method of blue-phase liquid crystal composite material containing bending molecule with branched chain structure

A technology of branched chain structure and blue phase liquid crystal, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of high melting point of curved molecules, limited application, poor compatibility, etc., and achieve improved solubility, good reference value, and reduced Effect of Phase Transition Temperature

Active Publication Date: 2016-04-20
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, such curved molecules have high melting point, high viscosity, and poor compatibility with liquid crystal systems, which limit their application in blue phase liquid crystal materials.

Method used

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  • Preparation method of blue-phase liquid crystal composite material containing bending molecule with branched chain structure
  • Preparation method of blue-phase liquid crystal composite material containing bending molecule with branched chain structure
  • Preparation method of blue-phase liquid crystal composite material containing bending molecule with branched chain structure

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Embodiment 1

[0049] A series of curved blue phase auxiliary molecules are synthesized, the curved blue phase auxiliary molecules to be synthesized contain two flexible terminal chains, at least one of the two flexible terminal chains contains a branched chain structure.

[0050] First choose a five-membered ring as the center, and then extend the length of the intermediate rigid structure and the terminal flexible structure at two positions between the phases; the following takes the thiophene five-membered ring as an example to illustrate the synthesis process of the curved blue phase auxiliary molecule. Such as figure 1 Shown:

[0051] (1) Synthesis and characterization of 2,5-bis(4-methoxyphenyl)thiophene

[0052] Into a 500 mL round bottom flask was added 4-methylphenylboronic acid (17.59 g, 115 mmol), CTMAB (1.56 g, 5 wt%) and PdCl 2 (PPH 3 ) 2 (0.52g, 0.5mol%), after pumping out three times to remove the air, feed nitrogen, then saturated K 2 CO 3 The solution (60 mL), tetrahyd...

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Abstract

The invention provides a preparation method of a blue-phase liquid crystal composite material containing a bending molecule with a branched chain structure and belongs to the field of liquid crystal materials and display. The preparation method comprises steps as follows: a bending type blue-phase assistant molecule is added to a cholesteric-phase matrix liquid crystal, and the blue-phase liquid crystal composite material is prepared; the bending type blue-phase assistant molecule contains two flexible tail end chains, and at least one of the two flexible tail end chains has the branched chain structure; the branched chain structure contains one or more substituent groups, and each substituent group is an alkyl chain containing one or more carbons; the blue-phase temperature range of the liquid crystal composite material is 20-30 DEG C. The preparation method of the blue-phase liquid crystal composite material is simple, the added bending type blue-phase assistant molecule can be mixed with a liquid crystal system very well and has high compatibility with the liquid crystal system, and the prepared blue-phase liquid crystal composite material has a broader blue-phase temperature range.

Description

technical field [0001] The invention belongs to the field of liquid crystal materials and displays, and in particular relates to a preparation method of a blue phase liquid crystal composite material containing bent molecules of a branched chain structure. Background technique [0002] The discovery of liquid crystals has a history of more than 100 years. With the rapid development of science and technology, liquid crystal materials have also played a huge role in the display field. However, the size, definition and response speed of the current liquid crystal display still cannot meet the needs of today's society. Therefore, blue-phase liquid crystals are considered to be a new type of liquid crystal display material with the most development prospects due to their microsecond-level response speed, wide viewing angle, no need for liquid crystal alignment layers, and low driving voltage. [0003] The blue phase generally exists between the cholesteric phase and the isotropi...

Claims

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Application Information

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IPC IPC(8): C09K19/54C09K19/58
CPCC09K19/54C09K19/586C09K19/588
Inventor 何万里杨洲张卫锴王冬曹晖
Owner UNIV OF SCI & TECH BEIJING
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