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Azobenzene and cinnamic acid ester group-containing side-chain-type liquid crystal polymer membrane material and synthetic method therefor

A side chain type liquid crystal, cinnamate technology, applied in liquid crystal materials, chemical instruments and methods, organic chemistry and other directions, can solve the problems of difficult to improve the viewing angle of liquid crystal display, difficult multi-domain process, easy to damage color display filter film and so on

Inactive Publication Date: 2013-10-30
NANKAI UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The rubbing method has the advantages of simple process and easy large-scale orientation, but it still has many defects: (1) A large amount of electrostatic charge and dust particles generated during the rubbing process will cause great damage to the surface alignment film and the display of the device Function; (2) Difficult to use in multi-domain technology, and multi-domain technology is currently a better way to solve the narrow viewing angle of liquid crystal display, so it is difficult to improve the viewing angle of liquid crystal display manufactured by rubbing method; (3) Higher in the process The curing temperature (300°C) and the use of polar solvents are easy to damage the filter film in the color display
While maintaining the advantages of photoisomerization of azobenzene, the photo-crosslinking properties of cinnamate groups are used to make up for the shortcomings of insufficient orientation stability of azobenzene photoisomerization

Method used

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  • Azobenzene and cinnamic acid ester group-containing side-chain-type liquid crystal polymer membrane material and synthetic method therefor
  • Azobenzene and cinnamic acid ester group-containing side-chain-type liquid crystal polymer membrane material and synthetic method therefor
  • Azobenzene and cinnamic acid ester group-containing side-chain-type liquid crystal polymer membrane material and synthetic method therefor

Examples

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Embodiment

[0023] Synthesis of 4-(4-hydroxyphenyl)azobenzoic acid

[0024] Under an ice-water bath, a 30 mL aqueous solution of sodium nitrite (3.8 g, 55.0 mmol) was added dropwise to p-aminobenzoic acid (6.9 g, 50.0 mmol) hydrochloric acid solution (14 mL concentrated hydrochloric acid and 60 mL distilled water). After stirring in an ice-water bath for 30 minutes, the above mixture was poured into 80 mL of an aqueous solution of phenol (4.7 g, 50.0 mmol) and sodium hydroxide (6.9 g, 172.0 mmol), and continued stirring in an ice-water bath for 2 hours. After neutralization, the crude product was obtained by suction filtration, washed successively with distilled water and absolute ethanol, recrystallized with 4% aqueous sodium bicarbonate solution, and vacuum-dried at 50°C to obtain 10.2 g of dark red needle-like crystals with a yield of 84%.

[0025] Synthesis of Cinnamoyl Chloride

[0026] Add cinnamic acid (9.9g, 67.0mmol) and 12mL thionyl chloride to a 50mL round bottom flask and sti...

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Abstract

The invention relates to a novel azobenzene and cinnamic acid ester group-containing side-chain-type liquid crystal polymer membrane material and a synthetic method therefor. The structural formula is , wherein the m value is 2-8. The membrane material aims to maintain the advantage of photo-isomerization of azobenzene, and utilizes the characteristic of photoinduced crosslinking of cinnamic acid ester group to overcome the defect of insufficient stability of orientation of photo-isomerization of azobenzene.

Description

Technical field: [0001] The invention relates to a novel side-chain type liquid crystal polymer membrane material containing azobenzene and cinnamate groups and a synthesis method thereof. Background technique: [0002] In liquid crystal display technology, the uniform orientation of liquid crystal molecules on the surface of the substrate is the key to the technology, which is achieved through the induction of the alignment film on the surface of the liquid crystal cell substrate. In current industrial production, alignment films are mainly produced by rubbing. The rubbing method has the advantages of simple process and easy large-scale orientation, but it still has many defects: (1) A large amount of electrostatic charge and dust particles generated during the rubbing process will cause great damage to the surface alignment film and the display of the device Function; (2) Difficult to use in multi-domain technology, and multi-domain technology is currently a better way to...

Claims

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Application Information

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IPC IPC(8): C08G65/333C07D249/04C09K19/38C09K19/34
Inventor 何尚锦赵佳睿康小明赵娟
Owner NANKAI UNIV
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