Self-supporting blue-phase liquid crystal film and preparation method thereof

A blue-phase liquid crystal, self-supporting technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of high reflectivity and unstable blue-phase liquid crystal, achieve high reflectivity, widen the blue-phase temperature range, and stabilize blue-phase liquid crystals. The effect of phase structure

Active Publication Date: 2020-09-15
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach has not been reasonably and effectively applied to blue-phase materials so far, mainly due to the inherent instability of blue-phase liquid crystals.
It is still a promising but challenging work to prepare self-supporting, high-reflectivity, and wide-temperature-range blue-phase liquid crystal materials through simple methods

Method used

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  • Self-supporting blue-phase liquid crystal film and preparation method thereof
  • Self-supporting blue-phase liquid crystal film and preparation method thereof
  • Self-supporting blue-phase liquid crystal film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] 1) Mix chiral liquid crystal R5011, achiral polymerizable liquid crystal RM105, achiral polymerizable liquid crystal RM82, and non-liquid crystal cross-linking agent TMPTA, and their mass proportions are: 4.0%, 60%, 26%, and 10%, respectively , forming a liquid crystal mixture; adding a photoinitiator I-651 with a mass ratio of 1% to the liquid crystal mixture.

[0081] 2) Fully dissolve the liquid crystal mixture and the photoinitiator with dichloromethane, sonicate for 10 minutes, and then put it into a 60-degree drying oven to completely volatilize the dichloromethane to obtain a liquid crystal precursor;

[0082] 3) Pour the liquid crystal precursor into the glass sheet to assemble the liquid crystal cell;

[0083] 4) Place the liquid crystal cell on a temperature-controllable hot stage, and cool down to 82°C at a rate of 5-20°C / min at 100°C; then cool down to 75°C at a rate of 0.01-1°C / min to obtain blue phase state;

[0084] 5) Use 1~50mW / cm 2 Ultraviolet light...

Embodiment 2

[0087] 1) Mix chiral liquid crystal R5011, achiral small molecule liquid crystal mixture HTG135200-100, achiral polymerizable liquid crystal RM105, achiral polymerizable liquid crystal RM82, and non-liquid crystal cross-linking agent TMPTA, and the mass proportions are respectively: 3.5%, 68%, 15%, 10%, 3.5%, to form a liquid crystal mixture; add photoinitiator I-651 with a mass ratio of 1% to the liquid crystal mixture.

[0088] 2) Fully dissolve the liquid crystal mixture and the photoinitiator with dichloromethane, sonicate for 10 minutes, and then put it into a 60-degree drying oven to completely volatilize the dichloromethane to obtain a liquid crystal precursor;

[0089] 3) Pour the liquid crystal precursor into the glass sheet to assemble the liquid crystal cell;

[0090] 4) Place the liquid crystal cell on a temperature-controllable hot stage, and cool down to 82°C at a rate of 5-20°C / min at 100°C; then cool down to 78°C at a rate of 0.01-1°C / min;

[0091] 5) Use 1~50...

Embodiment 3

[0094] 1) Mix the chiral liquid crystal LC756, the achiral small molecule liquid crystal mixture HTG135200-100, the achiral polymerizable liquid crystal RM105, the achiral polymerizable liquid crystal RM257 and the non-liquid crystal cross-linking agent HDDA, and the mass proportions are respectively: 3.0%, 30.5%, 46%, 15%, 5.5%, to form a liquid crystal mixture; the photoinitiator I-651 with a mass ratio of 1% to the liquid crystal mixture is added.

[0095] 2) Fully dissolve the liquid crystal mixture and the photoinitiator with dichloromethane, sonicate for 10 minutes, and then put it into a 60-degree drying oven to completely volatilize the dichloromethane to obtain a liquid crystal precursor;

[0096] 3) Pour the liquid crystal precursor into the glass sheet to assemble the liquid crystal cell;

[0097] 4) Place the liquid crystal cell on a temperature-controllable hot stage, and cool down to 62°C at a rate of 5-20°C / min at 100°C; then cool down to 59°C at a rate of 0.01-...

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Abstract

The invention provides a self-supporting blue-phase liquid crystal film. The self-supporting blue-phase liquid crystal film comprises the following components in percentage by mass: 3-7% of chiral liquid crystal, 24-93% of achiral polymerizable liquid crystal, 0-65% of achiral small molecular liquid crystal and 4-12% of non-liquid crystal cross-linking agent. The blue-phase liquid crystal film canrealize self-supporting and is not limited by a liquid crystal box, so that the application range of the blue-phase liquid crystal film is greatly expanded; the temperature range of the blue phase isnot lower than 220 DEG C, and the reflection band gap and the reflectivity can be regulated and controlled by adjusting the proportion of all the raw materials. In addition, the blue-phase liquid crystal film is simple to prepare and operate, low in cost and suitable for large-scale preparation.

Description

technical field [0001] The invention relates to the field of liquid crystal films, in particular to a self-supporting blue phase liquid crystal film and a preparation method thereof. Background technique [0002] Photonic crystals are composed of periodic arrangements of materials with different dielectric constants, and have distinct structural colors. The structural color of photonic crystals mainly comes from the ability of its periodic structure to regulate light. The blue phase liquid crystal is also considered as a three-dimensional photonic crystal. Blue phase liquid crystals usually appear between the isotropic state and the cholesteric phase state, with only a temperature range of 0.5 to 2 degrees. At present, many methods have been developed to stabilize the blue phase and broaden the temperature range of the blue phase, such as: polymer stabilization method, nanoparticle doping method, bending liquid crystal molecule stabilization method, T-type molecular stabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1333G02F1/137
CPCG02F1/1333G02F1/137
Inventor 王京霞杨佳佳江雷
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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