Method for preparing wide wave reflective film by using polymer stabilized cholesteric phase liquid crystal material

A cholesteric liquid crystal and polymer technology, applied in nonlinear optics, instruments, optics, etc., can solve problems such as complex equipment, difficult process control, and sensitivity to ultraviolet radiation intensity, and achieve the effect of wide material sources and simple material system

Inactive Publication Date: 2010-05-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that due to the presence of UV-absorbing pigments, this method is very sensitive to the intensity of UV radiation, and a monochromatic light sensor is required to detect the polarizer during the manufacturing process.
The equipment is more complex and the process is more difficult to control

Method used

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  • Method for preparing wide wave reflective film by using polymer stabilized cholesteric phase liquid crystal material
  • Method for preparing wide wave reflective film by using polymer stabilized cholesteric phase liquid crystal material
  • Method for preparing wide wave reflective film by using polymer stabilized cholesteric phase liquid crystal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Mix C6M / SCL-1717 / S811=35.0% / 47.5% / 17.5% by mass ratio, then add photoinitiator and mix homogeneously (photoinitiator accounts for 0.5% of C6M gross weight) in the system, make mixed The ligand system is used as "mixture 1"; then C6M / SCL-1717 / S811=5.0% / 80.0% / 15.0% is mixed evenly according to the mass ratio, and then the photoinitiator is added to the system and mixed evenly (the photoinitiator accounts for the total amount of C6M 0.5% by weight), and a compounded system was prepared as "sample 2". The structural formulas or trade names of the materials used above are as follows: figure 1 shown.

[0028] The above-mentioned "mixture 1" was injected into a liquid crystal cell which had been planarly oriented in advance, and the thickness of the liquid crystal cell was 25.0 μm. Afterwards, heat-preserve the perfused liquid crystal cells at 343.2K for 15 minutes, so that the perfused compound system forms a stable planar texture, and irradiate the liquid crystal cells afte...

Embodiment 2

[0031] Mix C6M / SCL-1717 / S811=35.0% / 55.0% / 10.0% by mass ratio, then add photoinitiator and mix homogeneously (photoinitiator accounts for 0.5% of C6M gross weight) in the system, make mixed The ligand system is used as "mixture 2"; then C6M / SCL-1717 / S811=5.0% / 87.6% / 7.4% is mixed evenly by mass ratio, then photoinitiator is added to the system and mixed evenly (photoinitiator accounts for the total amount of C6M 0.5% by weight), and a compounded system was prepared as "Sample 5". The structural formulas or trade names of the materials used above are as follows: figure 1 shown. The pure polymer network of "Mixture 2" prepared according to the method of Example 1 is referred to as "Sample 4".

[0032] Inject the above "sample 5" into "sample 4", and irradiate with ultraviolet light again to cause polymerization and crosslinking between the molecules of photopolymerizable monomers, and record the diffusion process of "sample 5" in "sample 4" , at this point we call it "Sample 6"...

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Abstract

The invention belongs to the field of application of liquid crystal materials, and provides a method for preparing a wide wave reflective film by using a polymer stabilized cholesteric phase liquid crystal material. The polymer stabilized cholesteric phase liquid crystal material can be widely used in the fields of light enhancement films of liquid crystal displays, energy-saving glass sticking films and the like. The method comprises a process that the wide wave reflective film is prepared by evenly mixing a non-photopolymerisable nematic phase micro-molecule liquid crystal, a photopolymerisable nematic phase liquid crystal monomer, a chiral compound and a photoinitiator in a certain mass ratio; and a polymer network is formed through ultraviolet radiation. In the method, a liquid crystal box is soaked in organic solvent to extract the unreacted micro-molecule liquid crystal so as to obtain a pure polymer network; a coarse-pitch cholesteric phase liquid crystal is injected into the system; and ultraviolet polymerization is performed again to fix the swelling process of the polymer network so as to form the polymer stabilized cholesteric phase liquid crystal material with wide wave reflection. The method has the advantages that the material system and the manufacturing process are simple, the material source is extensive, and the reflected wave width and the reflection position of the system can be adjusted by changing the reflection positions of the polymer network and the injected cholesteric phase liquid crystal.

Description

technical field [0001] The invention belongs to the application field of liquid crystal materials, and provides a method for preparing a broadband reflection film by stabilizing a cholesteric phase liquid crystal material with a polymer. The material can be widely used in the fields of light enhancement film of liquid crystal display, energy-saving glass film and the like. Background technique [0002] Liquid crystals are partially ordered substances composed of rod-shaped molecules, disc-shaped molecules, and other molecules that do not have spherical symmetry. It is not only different from the isotropic liquid whose molecular arrangement is completely chaotic, but also different from the crystal whose molecular arrangement is completely ordered. This molecular arrangement between crystals and liquids and the special shape and properties of the molecules themselves lead to liquid crystals showing properties that are between liquids and crystals, and even far more complex. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1333
Inventor 杨槐马国靖曹晖
Owner UNIV OF SCI & TECH BEIJING
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