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Optical structure and preparation method based on semi-interpenetrating network of cholesteric liquid crystal polymer

A technology of cholesteric liquid crystal and semi-interpenetrating network, which is applied in the field of optical structure and preparation based on semi-interpenetrating network of cholesteric liquid crystal polymer, and can solve the problem that the high can only reach 50%.

Active Publication Date: 2021-01-05
SHENZHEN GUOHUA OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wavelength selectivity of CLC is determined by its helical pitch, and because the chirality of the helical structure determines that CLC can only reflect circularly polarized light consistent with its chirality, and the reflection efficiency for unpolarized light can only reach 50%.

Method used

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  • Optical structure and preparation method based on semi-interpenetrating network of cholesteric liquid crystal polymer
  • Optical structure and preparation method based on semi-interpenetrating network of cholesteric liquid crystal polymer
  • Optical structure and preparation method based on semi-interpenetrating network of cholesteric liquid crystal polymer

Examples

Experimental program
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Effect test

Embodiment 1

[0033] This embodiment provides a layered optical structure based on a cholesteric liquid crystal polymer semi-interpenetrating network, which is prepared by the following steps:

[0034] S1. Weigh 77 parts by mass of liquid crystal elastomer, 21 parts by mass of polymerizable chiral liquid crystal monomer, 1 part by mass of photoinitiator and 1 part by mass of surfactant and mix to form a liquid crystal mixture, which is placed in a brown bottle, The brown bottle was heated to 60° C. while stirring at a speed of 40 r / s to transform the liquid crystal material mixture into an isotropic liquid crystal mixture. Choose a black PET substrate, and prepare a layer of uniform liquid crystal mixture coating on the substrate by scraping the liquid crystal mixture material, with a thickness of about 25 microns;

[0035] S2. Use linearly polarized ultraviolet light to irradiate the liquid crystal mixture coating for 1 minute along the direction perpendicular to the substrate and scrape c...

Embodiment 2

[0039] This example provides a patterned film 1. The preparation process is the same as that of Example 1, except that the thickness of the liquid crystal mixture coating is 22 μm. "TU / e" mask, and then remove the mask to proceed to step S3.

[0040] This embodiment also provides a second patterned film, the preparation process of which is the same as that of the first patterned film, except that the coating thickness of the liquid crystal mixture is 11 μm.

[0041] A patterned film whose reflective properties depend on the polarization of incident light can be obtained after the first step of exposure through linearly polarized light plus a patterned mask. In this example we used a pattern with the letters "TU / e". After the first exposure step, the entire coating was fully polymerized by exposing it to unpolarized UV light, thereby obtaining a layered, cholesteric A monogram pattern of cholesteric phase material, and a surrounding background of non-layered, cholesteric phase...

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Abstract

Disclosed are an optical structure based on a cholesteric liquid crystal polymer semi-interpenetrating network, and a preparation method therefor. The optical structure comprises a semi-interpenetrating polymer network layer and a cholesteric liquid crystal layer, which are arranged according to periodicity, wherein the semi-interpenetrating polymer network layer is formed by means of the interpenetration of a liquid crystal elastomer and a cholesteric liquid crystal polymer network, and the cholesteric liquid crystal layer comprises the liquid crystal elastomer and a cholesteric liquid crystal. The performance of the optical structure with regard to reflecting non-polarized light is good.

Description

technical field [0001] The invention relates to the field of optical structures, in particular to an optical structure based on a cholesteric liquid crystal polymer semi-interpenetrating network and a preparation method. Background technique [0002] Color is an important element in everyday life and plays an irreplaceable role in the fields of aesthetics, signaling, attracting attention, and distinguishing objects. The reason for the color can be roughly divided into two categories, one is the absorption of specific wavelengths by dye molecules or pigment particles, and the other is the use of regular nanostructures close to the wavelength of visible light. Such nanostructures are called photonic crystals (photonic crystals, PCs), and common ones include one-dimensional, two-dimensional, and three-dimensional photonic crystals. Different parts of these nanostructures usually have different refractive indices (RI). Visible light enters the photonic crystal and forms constru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/00G02B5/12
CPCG02B1/002G02B5/12
Inventor 奥古斯丁·卡尔迪克·杨·波尔阿尔伯特·斯凯宁周国富
Owner SHENZHEN GUOHUA OPTOELECTRONICS
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