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Dual-reflection zone cholesteric liquid crystal film with reversible light response characteristic and preparation method for dual-reflection zone cholesteric liquid crystal film

A cholesteric liquid crystal, double-reflection technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems that the film does not have the performance of reversible light regulation, the film preparation method is complicated, and the yield is low.

Active Publication Date: 2014-11-12
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Through different thin film preparation techniques, thin films with different properties and reflective properties can be obtained, but the prepared thin films do not have the performance of reversible light control. The reported preparation methods of films with light reversible control properties are very complicated and costly low rate

Method used

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  • Dual-reflection zone cholesteric liquid crystal film with reversible light response characteristic and preparation method for dual-reflection zone cholesteric liquid crystal film
  • Dual-reflection zone cholesteric liquid crystal film with reversible light response characteristic and preparation method for dual-reflection zone cholesteric liquid crystal film
  • Dual-reflection zone cholesteric liquid crystal film with reversible light response characteristic and preparation method for dual-reflection zone cholesteric liquid crystal film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1 As shown, a method for preparing a double-reflection band cholesteric liquid crystal film with reversible photoresponse characteristics, the shown method includes the following steps:

[0042] 1) In terms of mass percentage, mix S811110%, polymerizable monomer C6M25%, nematic liquid crystal slc171764.25% and benzoin dimethyl ether 0.75%;

[0043] 2) injecting the compounded liquid crystal system obtained in step 1) into a liquid crystal cell with a thickness of 25 microns in advance at 45° C. to obtain a film before polymerization;

[0044] 3) the film sample before polymerization prepared in step 2) is 365nm with wavelength in the temperature range of cholesteric phase, and intensity is 10mW / cm 2 UV light is irradiated and polymerized for 30 minutes to obtain a polymerized film with a polymer network formed inside;

[0045] 4) Soak the polymerized film sample in step 3) in cyclohexane to wash out unreacted small molecule liquid crystals to obtain a wash...

Embodiment 2

[0055] like figure 1 As shown, a method for preparing a double-reflection band cholesteric liquid crystal film with reversible photoresponse characteristics, the shown method includes the following steps:

[0056] 1) In terms of mass percentage, 20% of polymerizable monomer DCM, nematic liquid crystal slc171779% and 1% of benzoin dimethyl ether are mixed;

[0057] 2) injecting the compounded liquid crystal system obtained in step 1) into a liquid crystal cell with a thickness of 25 micrometers which has been pre-parallel-oriented at 45° C. to obtain a corresponding film before polymerization;

[0058] 3) the film sample before polymerization prepared in step 2) is 365nm with wavelength in the temperature range of cholesteric phase, and intensity is 10mW / cm 2 UV light is irradiated and polymerized for 30 minutes to obtain a polymerized film with a polymer network formed inside;

[0059] 4) Soak the polymerized film sample in step 3) in cyclohexane to wash out unreacted small ...

Embodiment 3

[0067] like figure 1 As shown, a method for preparing a double-reflection band cholesteric liquid crystal film with reversible photoresponse characteristics, the shown method includes the following steps:

[0068] 1) In terms of mass percentage, mix S811115%, polymerizable monomer C6M20%, nematic liquid crystal slc701164.5% and 0.5% benzoin dimethyl ether;

[0069] 2) injecting the compounded liquid crystal system obtained in step 1) into a liquid crystal cell with a thickness of 25 micrometers which has been pre-parallel-oriented at 45° C. to obtain a corresponding film sample before polymerization;

[0070] 3) the film sample before polymerization prepared in step 2) is 365nm with wavelength in the temperature range of cholesteric phase, and intensity is 10mW / cm 2 UV light was irradiated for 30 minutes and polymerized to obtain a polymerized film sample with a polymer network formed inside;

[0071] 4) Soak the polymerized film sample in step 3) in cyclohexane to wash out ...

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Abstract

The invention discloses a dual-reflection zone cholesteric liquid crystal film with a reversible light response characteristic and a preparation method for the dual-reflection zone cholesteric liquid crystal film. The method comprises the following steps of 1) mixing a chiral compound, a polymerizable monomer, nematic phase liquid crystals and a photoinitiator, pouring the mixture into a liquid crystal box, and irradiating by using ultraviolet light to form a cholesteric phase polymer film; 2) soaking the cholesteric phase polymer film in a nonpolar solvent to remove unreacted micromolecular liquid crystals, and pouring a mixture of binaphthylyl azobenzene compounds and the nematic phase liquid crystals to obtain the dual-reflection zone cholesteric liquid crystal film with the reversible light response characteristic. The film prepared by the method can reflect light in two wave bands and can cover a wavelength range of 500-2,000nm. The film has a good memory effect and has high potential application value in the fields such as adjustable optical filters, adjustable multi-mode laser protection, anti-counterfeiting and liquid crystal display.

Description

technical field [0001] The invention belongs to the technical field of optical thin film materials. Specifically, the invention relates to a double-reflection band cholesteric liquid crystal film with reversible light response characteristics and a preparation method thereof. Background technique [0002] Liquid crystal is a substance between solid and liquid. It has not only the anisotropy of crystal, but also the continuity and fluidity of liquid. The liquid crystal state is called the fourth state besides solid state, liquid state and gas state. phase state. From a macroscopic point of view, liquid crystals have not only mechanical properties such as flow, viscosity, and deformation of liquids within a certain temperature range, but also anisotropic physical properties such as thermal, electrical, optical, and magnetic properties of solids. According to the classification method of liquid crystal molecules, liquid crystals can be divided into three types: smectic liquid ...

Claims

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Application Information

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IPC IPC(8): G02F1/13
Inventor 杨槐赵玉真张兰英贺泽民李辰悦
Owner PEKING UNIV
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