Biphenyl acetylene blue phase liquid crystal composite material and production method

A technology of blue-phase liquid crystal and composite materials, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of increased driving voltage of blue-phase liquid crystal materials, poor polymer stability, and increased manufacturing difficulty, and achieves large optical omnidirectionality. The effect of anisotropy and dielectric anisotropy, good electro-optical properties, simple structure

Active Publication Date: 2012-12-19
KUSN INFOVISION OPTOELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have a certain effect on broadening the blue phase temperature range of blue phase liquid crystals, there are still many shortcomings. For example, the polymer stabilized blue phase has poor stability, short life, and even difficult to drive; Structural molecules stabilizing the blue phase can easily lead to an increase in the driving voltage of the blue phase liquid crystal material and poor solubility; while nanoparticles stabilize the blue phase, due to the influence of the dispersion of the nanoparticles, it will not only increase the difficulty of production but also not conducive to improving the blue phase. Properties of phase liquid crystal materials

Method used

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  • Biphenyl acetylene blue phase liquid crystal composite material and production method
  • Biphenyl acetylene blue phase liquid crystal composite material and production method
  • Biphenyl acetylene blue phase liquid crystal composite material and production method

Examples

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Embodiment 1

[0030] Embodiment 1 Preparation of at least one biphenyl alkyne liquid crystal compound

[0031] This embodiment is based on R1 * for R 2 for -H,R 3 for -H,R 4 Take -CN as an example to illustrate the synthesis method of biphenyl alkyne liquid crystal compounds.

[0032] Step 1) Phenylacetylation reaction: Dissolve 3.6g of 4-(7-methyl)heptyloxybiphenyl bromide in 30ml of tetrahydrofuran and 30ml of triethylamine mixed solution, place in the reactor under argon protection, and then add 10ml of alkynyl-terminated trimethylsilyl was heated up to 80°C; 140mg of triphenylphosphorous palladium dichloride and 228mg of cuprous iodide were added. Under the protection of argon, the reaction was refluxed for 12 hours. After the reaction was stopped, the solvent was distilled off under reduced pressure, and then purified by column chromatography. The developer was a mixed solvent of n-hexane and dichloromethane with a volume ratio of 4:1. The solvent was removed to obtain 2.5 g of...

Embodiment 2C5

[0036] Embodiment 2C5 series biphenylene blue phase liquid crystal composite material

[0037] This embodiment is to use at least one C5 series biphenyl alkyne liquid crystal compound, which is represented by R 1 * for R 2 -H or -F, R 3 -H or -F, R 4 for -CN. The at least one C5 series biphenylene liquid crystal compound in this embodiment is the following three types:

[0038]

[0039] The preparation of the C5 series biphenyl alkyne blue phase liquid crystal composite material is to select at least one of the C5 series biphenyl alkyne liquid crystal compounds, and add different amounts of chiral compounds therein, such as adding the chiral compound ISO(6OBA) 2 , chiral compound S1011, and at least one of chiral compound S811 are fully mixed uniformly by using, for example, an ultrasonic method. Wherein, in this embodiment, the mass percentage of at least one C5 series biphenyl alkyne liquid crystal compound is 75% to 90%, and the mass percentage of at least one ch...

Embodiment 3

[0042] Example 3 C8 series biphenylene blue phase liquid crystal composite material

[0043] This embodiment is to use at least one C8 series biphenyl alkyne liquid crystal compound, which is represented by R 1 * for R 2 -H or -F, R 3 -H or -F, R 4 for -CN. The at least one C8 series biphenylene liquid crystal compound in this embodiment is the following three types:

[0044]

[0045] The preparation of the C8 series biphenyl alkyne blue phase liquid crystal composite material is to select at least one of the C8 series biphenyl alkyne liquid crystal compounds, and add different amounts of chiral compounds therein, such as the chiral compound ISO(6OBA) 2 , chiral compound S1011, and at least one of chiral compound S811 are fully mixed uniformly by using, for example, an ultrasonic method. Wherein, in this embodiment, the mass percentage of at least one C8 series biphenyl alkyne liquid crystal is 75% to 90%, and the mass percentage of at least one chiral compound P c...

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Abstract

The invention relates to a biphenyl acetylene blue phase liquid crystal composite material, which comprises at least a biphenyl acetylene liquid crystal compound and a chiral compound, wherein the range of the mass percentage Pc of at least one chiral compound is greater than 0 and less than or equal to 30%. The biphenyl acetylene blue phase liquid crystal composite material has wide blue phase temperature range, simple structure, good solubility, large optical anisotropy and dielectric anisotropy, and has good electrooptic performance. The invention also relates to a method for producing the biphenyl acetylene blue phase liquid crystal composite material.

Description

technical field [0001] The invention relates to a liquid crystal material, and in particular to a biphenylene blue phase liquid crystal composite material and a manufacturing method thereof. Background technique [0002] The blue phase is a special phase state between the isotropic state and the cholesteric phase, and often appears in high-chiral liquid crystal systems. Compared with other liquid crystal materials, the blue phase liquid crystal material has the following excellent characteristics: (1) has a sub-millisecond response time (2) does not require an alignment layer, which can greatly simplify the manufacturing process; Homotropic, wide viewing angle. [0003] A series of excellent properties of blue-phase liquid crystals have aroused people's widespread interest. However, the conditions for the existence of blue-phase liquid crystals are relatively harsh, and the blue-phase temperature range is usually only about 1°C. Therefore, broadening the blue phase tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/58C09K19/18
Inventor 杨槐
Owner KUSN INFOVISION OPTOELECTRONICS
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