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Preparation method for liquid crystal material of electronic paper material

A liquid crystal material and paper technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of limited application and insufficient bright colors, and achieve the effect of low cost and simple processing equipment

Inactive Publication Date: 2010-03-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these materials control the orientation of liquid crystal molecules by changing various conditions, so that they can switch between the transparent state and the scattering state, that is, the black and white display mode, and the color is not bright enough, which limits its application in some fields.

Method used

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  • Preparation method for liquid crystal material of electronic paper material
  • Preparation method for liquid crystal material of electronic paper material
  • Preparation method for liquid crystal material of electronic paper material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Preparation of the liquid crystal cell: Spin-coat one side of the glass substrate with 3% polyvinyl alcohol aqueous solution, bake at 80° C. for 30 minutes, and then use flannelette to rub and align in one direction. Two oriented glass substrates were bonded together with a polyethylene spacer with a thickness of 25 μm along the orientation direction to make a surface-oriented liquid crystal cell.

[0034] (1) Preparation of hydrogen bond type chiral compound HCD. The pyridine chiral compound and the carboxylic acid chiral compound are uniformly mixed in the organic solvent tetrahydrofuran at a molar ratio of 1:1, and then the solvent is slowly evaporated completely at room temperature. Measure the variable temperature infrared spectrum of the hydrogen bond type chiral compound HCD. The result is as figure 2 shown.

[0035] (2) Prepare samples according to Table 1.

[0036] Table 1. Sample composition and ratio

[0037]

[0038] Dissolve the sample in tetrahydro...

Embodiment 2

[0044] Among them, the HCD process for the preparation of hydrogen bond type chiral compounds is as follows: the imidazole chiral compound and the alcohol chiral compound are mixed uniformly in the organic solvent tetrahydrofuran according to the molar ratio of 1:2, and then the solvent is slowly mixed at room temperature. Volatile completely.

[0045] All the other steps are the same as in Example 1, and the test results are similar to those in Example 1.

Embodiment 3

[0047] Among them, the HCD process for preparing hydrogen-bonding chiral compounds is as follows: the imidazole chiral compound and the phenol chiral compound are mixed uniformly in the organic solvent tetrahydrofuran according to the molar ratio of 3:1, and then the solvent is slowly mixed at room temperature. Volatile completely.

[0048] All the other steps are the same as in Example 1, and the test results are similar to those in Example 1.

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Abstract

The invention relates to a preparation method for liquid crystal material of electronic paper material, belonging to the functional polymer liquid crystal display field. The manufacturing process is that a series of choiesl-like compounds are mixed, so that the indoor temperature is in the liquid crystal state; nematic liquid crystal and hydrogenbond-like chirality compounds are fed in the mixture; when the temperature is raised to a certain degree, the hydrogenbond-like chirality compounds are decomposed, and the liquid-system thread pitch is changed, so that the reflecting color is changed;after the temperature is reduced to the room temperature, the changed color can keep a period of time, namely, the changed color has memory; then, along with the completion of the self-assembling of chirality compounds in the system, the reflecting color is recovered to the initial state; polymerizable monomer and light photoinitiator are added in the system, and a polymer wall is formed by ultraviolet polymerization under a photomask, thereby obtaining a reflecting colorful display electronic paper driven by a thermal field. The preparation method has the advantages that the background colorof the liquid crystal material can be regulated as required, the color is brilliant without the background source, the energy is saved, and the method can be applied in a display device, a thermal sensitivity temperature sensor and the like.

Description

technical field [0001] The invention belongs to the field of functional polymer liquid crystal displays, and relates to liquid crystal materials, cholesterol compounds and hydrogen bond self-assembly chiral compounds. When the external temperature changes, the reflection color of the composite material changes and has a memory effect. It can be applied to color display devices, heat-sensitive temperature sensors and the like. Background technique [0002] Liquid crystal is a special form of matter in nature. It is different from crystals and ordinary liquids in that in the liquid crystal state, the centroids of liquid crystal molecules are disordered (crystals are ordered), and their directors are ordered. (ordinary liquid disorder). Therefore, liquid crystal is an optically anisotropic material sensitive to external fields. Because of this special structure, liquid crystals can modulate light, and thus are widely used in the display field. [0003] Cholesteric liquid cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/52C09K19/56C09K19/36G02F1/1333G02F1/1337
Inventor 杨槐胡望宋黎程紫辉曹晖李喆杨洲李思瑾
Owner UNIV OF SCI & TECH BEIJING
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