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Variable iridescent liquid crystal photonic crystal material and preparation method thereof

A technology of photonic crystals and iridescent colors, applied in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as poor mechanical properties, difficulty in further expansion of three-dimensional dimensions, difficulty in photonic crystal materials, etc., and achieve good mechanical properties and easy three-dimensional dimensions Extend the effect of extension and controllable thickness

Active Publication Date: 2020-04-28
EZHOU INST OF IND TECH HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the materials prepared by this method have shortcomings such as thin thickness, poor mechanical properties, and difficulty in further expanding the three-dimensional size, and it is difficult to prepare a large area. These problems have seriously affected the application of iridescent photonic crystal materials.
Bottleneck problems in photonic crystal materials prepared by conventional photonic crystal preparation technology

Method used

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  • Variable iridescent liquid crystal photonic crystal material and preparation method thereof
  • Variable iridescent liquid crystal photonic crystal material and preparation method thereof
  • Variable iridescent liquid crystal photonic crystal material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: the preparation method of the liquid crystal photonic crystal material of variable iridescent color described in the present invention

[0052] (1) Mix 30ml of ethanol, 80ml of water and 0.1g of sodium lauryl sulfate, and heat up to 70°C;

[0053] (2) Mix 7g of styrene, 0.5g of divinylbenzene, 0.1g of RM-82 and 0.01g of photoinitiator 369, and stir for 10min;

[0054] (3) Add 4 g of the mixture obtained in step (2) to 65 ml of the mixture obtained in step (1);

[0055] (4) in the mixture that step (3) obtains, add potassium persulfate, wherein the addition of potassium persulfate and the ratio of the massfraction of styrene described in step (2) are 0.5%:100%; Then ultraviolet Light irradiation for 15 minutes, keeping at 70°C under nitrogen for 3h, and then freeze-drying at 1 mTorr and -30°C for 13h to obtain colloidal microsphere powder with a particle size of 10nm;

[0056] (5) The colloidal microsphere powder obtained in step (4) is subjected to a t...

Embodiment 2

[0059] Embodiment 2: the preparation method of the iridescent liquid crystal photonic crystal material of the present invention

[0060] (1) Mix 70ml of ethanol, 120ml of water and 1g of hexadecane, and heat up to 90°C;

[0061] (2) Mix 9g of methyl methacrylate, 2g of ethylene glycol dimethacrylate, 2g of RM-257 and 3690.2g of photoinitiator, and stir for 20min;

[0062] (3) Add 6 g of the mixture obtained in step (2) to 85 ml of the mixture obtained in step (1);

[0063] (4) in the mixture that step (3) obtains, add potassium persulfate, wherein the ratio of the amount of potassium persulfate added and the massfraction of methyl methacrylate described in the step (2) is 1.5%: 100%; then irradiated with ultraviolet light for 30 minutes, kept at 100°C under nitrogen for 9h, and then freeze-dried at 100 mtorr and -30°C for 11 hours to obtain colloidal microsphere powder with a particle size of 360nm;

[0064] (5) The colloidal microsphere powder obtained in step (4) is subj...

Embodiment 3

[0067] Embodiment 3: the preparation method of the liquid crystal photonic crystal material of variable iridescence described in the present invention

[0068] (1) Mix 50ml of ethanol, 100ml of water and 0.8g of polyvinyl alcohol, and heat up to 80°C;

[0069] (2) Mix ethyl methacrylate 9g, divinylbenzene 2g, R6M 2g and photoinitiator 365 0.2g, and stir for 15min;

[0070] (3) Add 5 g of the mixture obtained in step (2) to 75 ml of the mixture obtained in step (1);

[0071] (4) Add azobisisobutyronitrile to the mixture obtained in step (3), wherein the addition amount of said azobisisobutyronitrile and the mass fraction of ethyl methacrylate in said step (2) The ratio is 1%: 100%; then irradiated by ultraviolet light for 30min, kept at 70°C under nitrogen for 5h, then freeze-dried at 50 mTorr and at -30°C for 13h to obtain a colloidal microsphere powder with a particle size of 250nm;

[0072] (5) The colloidal microsphere powder obtained in step (4) is subjected to a therm...

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Abstract

The invention provides a preparation method of a variable iridescent liquid crystal photonic crystal material. The preparation method comprises the following steps: (1) mixing ethanol, water and a dispersing agent, and heating; (2) mixing a polymerizable monomer, a cross-linking agent, a liquid crystal monomer and a photoinitiator; (3) mixing the mixture obtained in the step (2) with the mixture obtained in the step (1); (4) mixing the mixture obtained in the step (3) with a polymerization initiator, irradiating with an ultraviolet lamp, keeping at 70-100 DEG C under nitrogen for 3-9 hours, and carrying out freeze drying to obtain colloidal microsphere powder; (5) completely converting the colloidal microsphere powder obtained in the step (4) into a molten state; (6) carrying out hot pressmolding on the material obtained in the step (5), and then cooling; and (7) performing solvent etching and air drying on the material obtained in the step (6) to obtain the variable iridescent liquidcrystal photonic crystal material. The liquid crystal photonic crystal material has the advantages of variable iridescent color, good mechanical properties, controllable thickness and easy expansionand extension preparation of the three-dimensional size.

Description

technical field [0001] The invention belongs to the technical field of processing and forming, and in particular relates to a liquid crystal photonic crystal material with variable iridescent colors and a preparation method thereof. Background technique [0002] Photonic crystal iridescence can be seen everywhere in nature, such as gemstones of various colors, morpho butterfly wings, peacock feathers, insect watch cases, etc. Specifically, the iridescent color is different from the dyes and pigments of chemical pigments. It is based on a series of optical processes of visible light waves in the micro-nano photonic crystal structure to generate structural colors corresponding to the scale of nano-units, and Has a property that varies with angle. The iridescent material has the advantages of angular discoloration, green environmental protection, high light intensity, and never fades. It has great application potential in the fields of color, anti-counterfeiting, laser, and mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F212/36C08F220/10C08F2/48C08J7/12C08F220/14C08F222/14C08F222/20C09K19/02C09K19/38C08L25/08C08L33/12
CPCC08F212/08C08F220/14C08F2/48C08J7/12C09K19/02C09K19/38C08J2325/08C08J2333/12C08F212/36C08F220/10
Inventor 周华民王云明赵虎李德群黄志高张云符岳陈丹
Owner EZHOU INST OF IND TECH HUAZHONG UNIV OF SCI & TECH
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