Method for improving planar orientation of cholesteric liquid crystal based on phase transition between smectic phase and cholesteric phase

A cholesteric liquid crystal, plane alignment technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., to achieve the effect of improving transmittance, improving order, and improving the utilization rate of light

Inactive Publication Date: 2012-06-20
UNIV OF SCI & TECH BEIJING
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  • Application Information

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  • Method for improving planar orientation of cholesteric liquid crystal based on phase transition between smectic phase and cholesteric phase
  • Method for improving planar orientation of cholesteric liquid crystal based on phase transition between smectic phase and cholesteric phase
  • Method for improving planar orientation of cholesteric liquid crystal based on phase transition between smectic phase and cholesteric phase

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Embodiment 1

[0040] First, clean the glass to make a liquid crystal cell. Modulate the mixture (sample 1) of smectic liquid crystal 8CB / cholesteric liquid crystal 5*CBB / small molecule nematic liquid crystal SLC1717 / chiral additive S811 with smectic phase-cholesteric phase transition (sample 1). Percentage by weight is 27.7% / 44.3% / 18.0% / 10.0%, and its smectic phase-cholesteric phase transition temperature is 51.7 ℃ (T 1 ), the clearing point is 135.0°C. Pour sample 1 into a liquid crystal cell or between two layers of plastic films at the clearing point, and cool the sample of liquid crystal cell or film material to 45.0°C. The liquid crystal sample presents a focal conic texture of light scattering. Then from the smectic phase of the sample to the cholesteric phase temperature T of the sample at 10.0°C / min, 5.0°C / min, 0.5°C / min 2 (70.0°C), the texture change of the sample was tested by a polarizing microscope, and the transmittance change of the sample was tested by a UV spectrophotomete...

Embodiment 2

[0042] First, clean the glass to make a liquid crystal cell. Modulate the mixture (sample 1) of smectic liquid crystal 8CB / cholesteric liquid crystal 5*CBB / small molecule nematic liquid crystal SLC1717 / chiral additive S811 with smectic phase-cholesteric phase transition (sample 1). Percentage by weight is 27.7% / 44.3% / 18.0% / 10.0%, and the phase transition temperature of its occurrence smectic phase-cholesteric phase is 51.7 ℃ (T 1 ), the clearing point is 135.0°C. At the clearing point, pour sample 1 into a liquid crystal cell or between two layers of plastic films, and cool the sample of liquid crystal cell or film material to 45°C. The liquid crystal sample presents a smectic phase, which is a focal conic texture of light scattering. Then the temperature is raised from the smectic phase of the sample to the smectic phase-cholesteric phase transition temperature T of the sample at a rate of 20.0 °C / min. 1 , and then kept at the smectic phase-cholesteric phase transition temp...

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Abstract

The invention provides a method for improving planar orientation of cholesteric liquid crystal based on smectic-cholesteric phase transition, which relates to the technical field of optical thin film materials and particularly relates to a planar orientation method of cholesteric liquid crystal display materials, such as an optical brightness enhancement film and an IR shielding film. The method comprises the following steps: mixing smectic liquid crystals, nematic liquid crystals, cholesteric liquid crystals, chiral additive and the like according to a certain ratio to prepare a complex liquid crystal system with smectic-cholesteric phase transition; stirring uniformly, and injecting the complex liquid crystal system into a liquid crystal box or between two plastic films; and heating the sample film at the smectic-cholesteric phase transition temperature mainly in two heat treatment manners, including slowly heating the sample film from smectic phase to cholesteric phase or keeping temperature close to the smectic-cholesteric phase transition temperature for a long time. The method has the advantage that both of the two heat treatment manners can improve planar orientation of cholesteric liquid crystals with different pitches, thereby improving transmittance of the liquid crystal film and effectively improving optical properties of cholesteric liquid crystal devices.

Description

technical field [0001] The invention belongs to the field of liquid crystal intelligence and display material application technology, and in particular provides a method for improving the plane orientation of cholesteric liquid crystals based on heat treatment using smectic phase-cholesteric phase transition. Various optical properties have been significantly improved, and can be widely used in the research of liquid crystal display, smart glass and related fields. Background technique [0002] Today, with the rapid increase of energy consumption, the human demand for energy is increasing. Electric energy and power energy have become indispensable and necessary energy consumption products in our life. Our way of life is increasingly dependent on the convenience of electricity and modern machinery. However, behind such dependence and convenience, we have unknowingly caused terrible damage to our living environment. The increase in the amount of harmful gases and smoke in th...

Claims

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Application Information

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IPC IPC(8): G02F1/1337G02F1/137C09K19/50
Inventor 杨槐王菲菲曹晖李克轩宋平吴晓娟
Owner UNIV OF SCI & TECH BEIJING
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