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Polymer stabilized blue phase liquid crystal composition as well as preparation method and application of liquid crystal composition

A liquid crystal composition and composition technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of high material viscosity, hysteresis, high driving voltage, etc., and achieve the effect of broadening the application range

Active Publication Date: 2015-01-07
青岛诚志光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, polymer-stabilized blue-phase liquid crystal materials still have some problems to be improved, such as: high driving voltage; high material viscosity, which is not conducive to processing; hysteresis; polymer network aging, etc.

Method used

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  • Polymer stabilized blue phase liquid crystal composition as well as preparation method and application of liquid crystal composition
  • Polymer stabilized blue phase liquid crystal composition as well as preparation method and application of liquid crystal composition
  • Polymer stabilized blue phase liquid crystal composition as well as preparation method and application of liquid crystal composition

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Experimental program
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Effect test

preparation example Construction

[0038] The method for preparing liquid crystal composition provided by the invention comprises the following steps:

[0039] First, each component can be placed in a container and mixed uniformly by heating and stirring with a magnetic stirrer, thereby preparing a mixture.

[0040] Next, heat the mixture until it is isotropic. The mixture is poured into a liquid crystal cell, and the liquid crystal cell is placed on a hot and cold table and heated to isotropy to obtain an isotropic mixture.

[0041] Afterwards, the isotropic mixture is cooled at a constant rate. Continue to place the liquid crystal cell containing the isotropic mixture on the hot and cold stage, control the cooling rate with the hot and cold stage, and cool the isotropic mixture to the blue phase temperature range T1~T2 at a uniform speed, T1 is the blue phase temperature The temperature lower limit of the zone, T2 is the temperature upper limit of the blue phase temperature zone.

[0042] Next, the cooled ...

Embodiment 1

[0045] 1) Weigh 400 mg of the compound shown in component B RM257 in component III and 400 mg of TMPEOTA in component A and place them in a container such as a penicillin vial, put a small stirring bar, heat and stir evenly on a magnetic stirrer, and make a polymer single The monomer mixture is ready for use, and the monomer mixture will serve as component III in the blue phase liquid crystal composition after subsequent photopolymerization.

[0046] 2) Weigh 930 mg of nematic liquid crystal (product number is P70-003, purchased from Shijiazhuang Chengzhi Yonghua Display Materials Co., Ltd.) and 70 mg of component I as 0.156 Δn and 33.6 ε, respectively. The resulting polymer monomer mixture is placed in a container such as a penicillin vial, and continues to weigh the chiral agent R5011 as component II Add 41.6 mg and UV photoinitiator IGRACURE 1840.5 mg into a penicillin vial, add a stirrer bar into the vial, heat and stir on a magnetic stirrer to form a mixed solution. Afte...

Embodiment 2

[0052] According to the steps of Example 1, only the consumption of A component TMPEOTA is replaced by 400 mg to 100 mg, and the consumption of nematic liquid crystal whose product number is P70-003 Δn is 0.156 and Δε is 33.6 is replaced by 930 mg to 950 mg, polymerized The amount of monomer mixture is replaced by 70 mg to 50 mg, the amount of chiral agent R5011 is replaced by 41.6 mg to 35.5 mg, the amount of ultraviolet photoinitiator IGRACURE184 is replaced by 0.5 mg to 0.3 mg, the blue phase temperature zone of the resulting mixture after cooling T1-T2 is 57-66°C. Next, carry out the constant temperature irradiation of ultraviolet light, the ultraviolet irradiation temperature T UV at 59°C, the UV irradiation energy is 0.2mw / cm 2 , the ultraviolet irradiation time is 30min, and the blue phase liquid crystal composition provided by the present invention is obtained.

[0053] Afterwards, the blue phase temperature range T1-T2 of the blue-phase liquid crystal composition wa...

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Abstract

The invention discloses a polymer stabilized blue phase liquid crystal composition as well as a preparation method and application of the liquid crystal composition. The liquid crystal composition comprises a component I, a component II and a component III, wherein the component I is a nematic phase liquid crystal which meets the following conditions: delta n is 0.13-0.2, and delta epsilon is 25-50; the component II is a chiral compound; the component III is a product which is prepared from a monomer in a photopolymerization manner. According to the liquid crystal composition disclosed by the invention, photopolymerization is initiated from a polymer monomer compound III by using a photoinitiator so as to form stable combination of the polymer, the chiral compound and a liquid crystal main body, so that the blue phase liquid crystal material is formed, the blue phase width of the blue phase liquid crystal material is effectively widened, for example, greater than 100 DEG C, and the blue phase temperature area of the blue phase liquid crystal material is widened to be extreme low temperature, such as at least -30 DEG C, so that the application range of the blue phase liquid crystal material is widened.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a polymer-stabilized blue-phase liquid crystal composition and a preparation method and application thereof. Background technique [0002] Blue phase liquid crystal display technology (Blue Phase Liquid Crystal hereinafter referred to as BPLC), its unique photoelectric response mode and photoelectric response speed make it have broad development space in the field of flat panel display. Compared with the existing liquid crystal materials, the blue phase liquid crystal has the following advantages: (1) It has a sub-millisecond response time; (2) It does not require an alignment layer, which can greatly simplify the tube manufacturing process; Isotropic, so it has a wide and symmetrical viewing angle; (4) It is not sensitive to the thickness of the liquid crystal cell, and is suitable for making large-scale display screens. However, because the blue phase generally appears in a narrow tempe...

Claims

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Application Information

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IPC IPC(8): C09K19/46G02F1/1333
Inventor 李正强华瑞茂张兴郭剑
Owner 青岛诚志光电科技有限公司
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