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A kind of preparation method of cholesteric liquid crystal composite film

A technology of cholesteric liquid crystal and composite film, which is applied in the field of liquid crystal application technology, can solve problems such as difficult control and complicated process, and achieve the effect of stabilizing a specific optical reflection mode

Active Publication Date: 2020-07-17
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a light-responsive cholesteric liquid crystal composite film with adjustable optical reflection characteristics. Through a simple process, a liquid crystal capable of moving the center reflection band, broadening the reflection band, and adjustable reflectivity can be prepared. Thin film material overcomes the shortcomings of complicated process and difficult control

Method used

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  • A kind of preparation method of cholesteric liquid crystal composite film
  • A kind of preparation method of cholesteric liquid crystal composite film
  • A kind of preparation method of cholesteric liquid crystal composite film

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Firstly, the glass is cleaned, and a liquid crystal cell with a thickness of 10 μm is fabricated with the inner surface subjected to parallel rubbing orientation treatment. The composite system of chiral helicene compound M10 (right-handed) / small molecule nematic liquid crystal SLC1717 is blended according to the ratio of 3.50 / 96.50 to prepare a liquid crystal composite system with a wide N* phase temperature range. First, the liquid crystal is composited The system is poured into a parallel-oriented liquid crystal cell, using different intensities of ultraviolet light (0-56.2mW / cm 2 , 365nm) for 1.5 minutes, and then obtain liquid crystal films with different reflection bands. After stopping the ultraviolet light irradiation for 3 minutes, the reflection peak of the cholesteric liquid crystal returned to the initial position (proves that the liquid crystal composite film has recovery properties).

[0042] The non-polarized, right-handed circularly polarized, and left-...

Embodiment 2

[0044] Firstly, the glass is cleaned, and a liquid crystal cell with a thickness of 10 μm is fabricated with the inner surface subjected to parallel rubbing orientation treatment. Since when the thickness of the liquid crystal film material is 10 μm, the gradient of the helical pitch from top to bottom in the system under ultraviolet light irradiation changes very little, and the helical pitch is approximately uniformly distributed, so by adjusting the chiral helicene compound (right-handed) / The proportion of chiral helicene compounds in the composite system of small molecule nematic liquid crystal SLC1717, such as the mass fraction is 2.00wt%-8.00wt%, and then the liquid crystal composite system is poured into the liquid crystal cell of parallel orientation, using different intensities Ultraviolet light (0-56.2mW / cm 2 , 365nm) for 1 minute, the controllable range of the reflection peak can be extended from the infrared light band to the visible light band and the ultraviolet...

Embodiment 3

[0048] Firstly, the glass is cleaned, and a liquid crystal cell with a thickness of 35 μm is fabricated with the inner surface subjected to parallel rubbing orientation treatment. The composite system of chiral helicene compound (right-handed) / small molecule nematic liquid crystal SLC1717 is blended according to the ratio of 3.50 / 96.50 to prepare a liquid crystal composite system with a wide N* phase temperature range. First, the liquid crystal composite system Poured into a parallel-oriented liquid crystal cell, using different intensities of ultraviolet light (0-100.0mW / cm 2 , 365nm) irradiation for 1 minute, and then obtain liquid crystal films with different reflection modes. After stopping the ultraviolet light irradiation for 2 minutes, the reflection peak of the cholesteric liquid crystal returned to its original position.

[0049] The non-polarized, right-handed circularly polarized, and left-handed circularly polarized transmission spectra of the liquid crystal film ...

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Abstract

The invention discloses a preparation method of cholesteric-liquid-crystal laminated film. The preparation method includes the steps of (1) introducing, by mass, 0.5wt%-10.0wt% of chirality helicene-type compound, 0wt%-15.0wt% of chirality compound, 0wt%-20.0wt% of liquid-crystal polymerizable monomer and 0wt%-10.0wt% of photoinitiator into a nematic-phase micro-molecule liquid crystal material serving as the main body with a mass fraction of 65.0wt%-98.0wt%, evenly blending the mixture above to obtain a mixed liquid crystal compound system with a phase temperature range which is N* in width; (2) injecting the mixed liquid crystal compound system into a liquid crystal box or making the mixed liquid crystal compound system into liquid crystal film, wherein the thickness of the liquid box or the liquid crystal film is controlled to remain within 2 microns-300microns; (3) conducting ultraviolet light irradiation on the liquid crystal box or the liquid crystal film within a cholesteric phase temperature range to obtain the liquid crystal laminated film. By adopting the preparation method, the liquid crystal film material with a movable central reflected wave section, a wide reflected wave band and a controllable reflection rate can be obtained.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal applications. Specifically, the invention relates to a method for preparing a light-responsive cholesteric liquid crystal composite film with adjustable optical reflection characteristics. The prepared film material can realize the reflection of light-regulated cholesteric liquid crystal The characteristics of band shifting, discontinuous multi-band reflection, continuous broad-wave reflection and reflectivity enhancement can be widely used in liquid crystal display, anti-counterfeiting, ultraviolet light intensity detector, adjustable grating and related fields. Background technique [0002] Since liquid crystal was discovered in 1888, it has developed vigorously in the past 20 years. From the popular electronic watches, to LCD TVs, mobile phones, and now to electronic paper and e-books, the application of liquid crystals in people's daily life is becoming more and more extensive. While l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/137
CPCG02F1/13718
Inventor 杨槐孙健于海峰余黎邹呈张兰英肖久梅
Owner PEKING UNIV
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