Holographic polymer dispersed liquid crystal grating and preparation method thereof

A technology for dispersing liquid crystals and polymers, applied in the direction of diffraction gratings, optics, optical elements, etc., can solve problems such as increasing the viscosity of the system, light scattering or light absorption, and affecting the comprehensive optical properties of holographic polymer dispersed liquid crystal gratings, etc., to improve diffraction Effect of Efficiency and Driving Voltage

Active Publication Date: 2017-07-14
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

At the same time, the addition of nanoparticles often increases the viscosity of the system, light scattering or ligh...

Method used

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  • Holographic polymer dispersed liquid crystal grating and preparation method thereof
  • Holographic polymer dispersed liquid crystal grating and preparation method thereof
  • Holographic polymer dispersed liquid crystal grating and preparation method thereof

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preparation example Construction

[0050] The corresponding preparation method can be adopted in the following way: synthesizing biphenylcyanide liquid crystal compounds with different alkyl chain lengths, compounding them with common commercial liquid crystals, compounding them with monomers, and further performing grating recording, so as to obtain simultaneously Holographic polymer dispersed liquid crystal composite gratings with high diffraction efficiency and low driving voltage. The specific steps can be as follows:

[0051] 1. Synthesis of liquid crystal nOCB;

[0052] (1) The ketone solution of 4-hydroxyl-4'-biphenylnitrile and NaOH is added in the round bottom flask, constant temperature;

[0053] (2) in the mixed solution that step (1) makes dropwise add Br(C n h 2n+1 ) of the ketone solution, backflow;

[0054] (3) Cool to room temperature, filter, wash the filtrate several times with NaOH aqueous solution, extract, and recrystallize from ethanol to obtain nOCB as a white solid product.

[0055]...

Embodiment 1

[0078] This embodiment includes the following steps:

[0079] 1. Synthetic liquid crystal 7OCB;

[0080] (1) The butanone solution of 4-hydroxyl-4'-biphenylnitrile and NaOH is added in the round bottom flask, and kept at a constant temperature of 30 minutes at 30°C; constant temperature treatment can make 4-hydroxyl-4'-biphenylnitrile and Sodium hydroxide reacts to generate sodium salt, and the constant temperature and time are all conducive to improving the reaction rate and yield.

[0081] (2) Add BrC dropwise to the mixed solution prepared in step (1) 7 h 15 Butanone solution (0.8mol / L), was refluxed at 80°C for 17 hours;

[0082] (3) Cool to room temperature, filter, and wash the filtrate several times with 0.2 mol / L NaOH aqueous solution, extract with toluene, and recrystallize with ethanol to obtain the white solid product 7OCB.

[0083] 2. Compounding of synthetic liquid crystals and commercial liquid crystals;

[0084] Add the synthesized liquid crystal 7OCB and t...

Embodiment 2

[0092] 1. Synthetic liquid crystal 9OCB;

[0093] (1) Add the 2-pentanone solution of 4-hydroxy-4'-biphenylnitrile and NaOH into the round bottom flask, and keep the temperature at 30° C. for 40 minutes;

[0094] (2) Add BrC dropwise to the mixed solution prepared in step (1) 9 h 19 2-pentanone solution (0.5mol / L), refluxed at 90°C for 18 hours;

[0095] (3) Cool to room temperature, filter, and wash the filtrate several times with 0.5 mol / L NaOH aqueous solution, extract with chloroform, and recrystallize with ethanol to obtain the white solid product 9OCB.

[0096] 2. Compounding of synthetic liquid crystals and commercial liquid crystals;

[0097] Add the synthesized liquid crystal 9OCB and the commercialized liquid crystal ZLI-4792 in a certain mass ratio into a 5 ml brown sample bottle, and ultrasonicate at 30° C. for 20 minutes to obtain a homogeneous mixture. The mass ratio of the synthesized liquid crystal to the commercial liquid crystal is 17 / 33.

[0098] 3. Pre...

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Abstract

The invention discloses a holographic polymer dispersed liquid crystal grating and a preparation method thereof. The holographic polymer dispersed liquid crystal grating is prepared through holographic record treatment on mixture including compound liquid crystal and photo-polymerizable monomer. The compound liquid crystal includes first kind liquid crystal compound and second kind liquid crystal compound, wherein the first kind liquid crystal compound is biphenyl cyanide liquid crystal compound, and the mass ratio of the first kind liquid crystal compound to the second kind liquid crystal compound in the compound liquid crystal is 3/26 to 15/10. The mass ratio of the compound liquid crystal to the photo-polymerizable monomer is 25/50 to 50/30. By means of improving a structure, composition and the corresponding preparation method of the key holographic polymer dispersed liquid crystal grating, a novel way for improving diffraction efficiency and a driving voltage requirement of the holographic polymer dispersed liquid crystal grating is provided.

Description

technical field [0001] The invention belongs to the field of functional composite materials, and more specifically relates to a holographic polymer-dispersed liquid crystal grating and its preparation. The holographic polymer-dispersed liquid crystal grating has both high diffraction efficiency and low driving voltage, and can greatly meet practical application requirements. Background technique [0002] Holographic polymer dispersed liquid crystal grating combines excellent processing performance of polymer and unique optical properties of liquid crystal, and has been widely used in high-tech fields such as 3D display, telepresence, optical switch, dynamic filter, flat panel display, data storage, security and anti-counterfeiting application. However, because it is difficult to have high diffraction efficiency and low driving voltage at the same time, the current holographic polymer dispersed liquid crystal gratings are greatly limited in practical applications. [0003] T...

Claims

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Application Information

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IPC IPC(8): G02F1/1334G02B5/18
CPCG02B5/1857G02F1/13342
Inventor 解孝林余磊杨志方彭海炎张小梅葛宏伟陈冠楠周兴平
Owner HUAZHONG UNIV OF SCI & TECH
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