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Preparation method for wide-temperature blue-phase liquid crystal composite material

A blue-phase liquid crystal and composite material technology, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of restricting the application of blue-phase materials and narrow temperature range, and achieve remarkable effects, good stability, and fast electric field response speed Effect

Inactive Publication Date: 2012-05-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stable temperature range of blue-phase liquid crystals is very narrow, usually only about 1°C, which greatly limits the application of blue-phase materials in the fields of display, laser, communication and microelectronics.

Method used

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  • Preparation method for wide-temperature blue-phase liquid crystal composite material
  • Preparation method for wide-temperature blue-phase liquid crystal composite material
  • Preparation method for wide-temperature blue-phase liquid crystal composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Synthesized a series of oxadiazole curved molecules, the molecular structure and phase transition temperature are as follows figure 1 shown. The composition of small molecule cholesteric liquid crystal (N*LC) is 83.0wt% mixed crystal SLC-X (Yongsheng Huatsing Liquid Crystal Co., Ltd, Δn=0.235, Δε=29.6 at 298K), 10.0wt% R811 and 7.0wt% % Iso-(6OBA)2, the oxadiazole molecules synthesized above were added to it in different proportions, and the blue phase liquid crystal texture and its phase transition temperature were observed with a polarizing microscope. The composition and phase transition of the blue phase liquid crystal composite material The temperature range is shown in Table 1, and the polarizing microscope photos when the temperature is lowered are as follows figure 2 shown.

[0029] Table 1 Composition and phase transition temperature of blue phase liquid crystal composite system

[0030]

[0031] In the table: XX-OXD: oxadiazole curved molecules; N*LC: s...

Embodiment 2

[0034] Synthesize a series of thiophene curved molecules, the molecular structure and phase transition temperature are as follows image 3 shown. The composition of small molecule cholesteric liquid crystal (N*LC) is 83.0wt% mixed crystal SLC-X (Yongsheng Huatsing Liquid Crystal Co., Ltd, Δn=0.235, Δε=29.6at 298K), 10.0wt% R811 and 7.0wt% % Iso-(6OBA) 2 , the above synthesized thiophene molecules were added in different proportions, and the blue phase liquid crystal texture and phase transition temperature were observed with a polarizing microscope. The composition and phase transition temperature range of the blue phase liquid crystal composite material are shown in Table 2.

[0035] Thiophene curved molecules have good solubility in mixed crystals, good stability, fast response speed, and remarkable effect in stabilizing the temperature range of the blue phase.

[0036] Table 2 Composition and phase transition temperature of blue phase liquid crystal composite system

[0...

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Abstract

The invention provides a preparation method for a wide-temperature blue-phase liquid crystal composite material, comprising the following steps of: adding bent liquid crystal molecules such as oxadiazoles and thiophenes in a micro-molecular nematic mixed crystal according to a certain ratio, then adding one or more chiral compounds in a proper amount and having a helical twisting power (HTP) of 8-100 mum<-1>, so as to induce and broaden the temperature range of a blue-phase liquid crystal, wherein the temperature range can achieve 5-30 DEG C. The preparation method for a wide-temperature blue-phase liquid crystal composite material provided by the invention is simple in preparation and remarkable in effect; and the prepared system is good in stability, low in viscosity, and fast in the speed of a response to an electric field.

Description

technical field [0001] The invention belongs to the field of liquid crystal materials and displays, and relates to a preparation method of a wide temperature blue phase liquid crystal composite material. Background technique [0002] Since liquid crystal was discovered in 1888, it began to be used in the display field in the 1960s. With the continuous updating of technology, liquid crystal displays have successively experienced TN, STN, TFT and other modes, which have solved the problems of poor stability, low resolution, low contrast and narrow viewing angle in liquid crystal display, and now occupy an absolute position in the display market. The advantages. However, with the improvement of people's living standards, large-size, high-definition liquid crystal displays have become the mainstream of the times, and there is an urgent need to improve the response speed of liquid crystal displays. Blue-phase liquid crystal materials are considered to be the most promising due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/52C09K19/34
Inventor 杨槐王玲何万里李毕荣
Owner UNIV OF SCI & TECH BEIJING
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