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Preparation method of light modulation film based on liquid crystal/polymer composite material

A technology of liquid crystal materials and composite materials, applied in the field of preparation of dimming films based on liquid crystal/polymer composite materials, can solve the problems of reducing the brightness and contrast of display devices, reduce the anchoring effect, increase the size, and improve the comprehensive The effect of electro-optical properties

Inactive Publication Date: 2019-08-06
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Current liquid crystal displays use polarizers to transmit and refract light, but polarizers reduce the brightness and contrast of the display device

Method used

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  • Preparation method of light modulation film based on liquid crystal/polymer composite material
  • Preparation method of light modulation film based on liquid crystal/polymer composite material
  • Preparation method of light modulation film based on liquid crystal/polymer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The photopolymerizable monomers selected were lauryl methacrylate, trimethylolpropane triacrylate and pentaerythritol tetrakis(3-mercaptopropionate). Mix the polymerizable monomer with the nematic liquid crystal SLC1717 at a mass ratio of 35.0:65.0. The mass ratio between lauryl methacrylate, trimethylolpropane triacrylate and pentaerythritol tetrakis(3-mercaptopropionate) is 18.0:9.0:8.0. The mass of the photoinitiator benzoin dimethyl ether (651) is 3.0% of the total mass of the photopolymerizable monomers. After stirring evenly, the mixture is in a clear state at room temperature, and the mixture is poured into a liquid crystal cell with a cell thickness of 20 μm by the siphon principle, and then heated at room temperature with a light intensity of 10 mw / cm 2 , a wavelength of 365nm ultraviolet light irradiation for 5 minutes to form the polymer dispersed liquid crystal film of Example 1.

[0031] Measure the electro-optical performance curve (such as figure 2 sh...

Embodiment 2

[0034]The photopolymerizable monomers selected were lauryl methacrylate, trimethylolpropane triacrylate and pentaerythritol tetrakis(3-mercaptopropionate). Mix the polymerizable monomer with the nematic liquid crystal SLC1717 at a mass ratio of 35.0:65.0. The mass ratio between lauryl methacrylate, trimethylolpropane triacrylate and pentaerythritol tetrakis(3-mercaptopropionate) is 21.0:12.0:2.0. The mass of the photoinitiator benzoin dimethyl ether (651) is 3.0% of the total mass of the photopolymerizable monomers. After stirring evenly, the mixture is in a clear state at room temperature, and the mixture is poured into a liquid crystal cell with a cell thickness of 20 μm by the principle of siphon, and then heated at room temperature with a light intensity of 10 mw / cm 2 , a wavelength of 365nm ultraviolet light irradiation for 5 minutes to form the polymer dispersed liquid crystal film of Example 2.

[0035] Measure the electro-optical performance curve (such as Figure 4...

Embodiment 3

[0038] The photopolymerizable monomers selected were lauryl methacrylate, trimethylolpropane triacrylate and pentaerythritol tetrakis(3-mercaptopropionate). Mix the polymerizable monomer with the nematic liquid crystal SLC1717 at a mass ratio of 45.0:55.0. The mass ratio between lauryl methacrylate, trimethylolpropane triacrylate and pentaerythritol tetrakis(3-mercaptopropionate) is 18.0:9.0:8.0. The mass of the photoinitiator benzoin dimethyl ether (651) is 3.0% of the total mass of the photopolymerizable monomers. After stirring evenly, the mixture is in a clear state at room temperature, and the mixture is poured into a liquid crystal cell with a cell thickness of 20 μm by the principle of siphon, and then heated at room temperature with a light intensity of 10 mw / cm 2 , a wavelength of 365nm ultraviolet light irradiation for 5 minutes to form the polymer dispersed liquid crystal film of Example 3.

[0039] Measure the electro-optical performance curve (such as Figure 6...

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Abstract

The invention provides a preparation method of a light modulation film based on a liquid crystal / polymer composite material. The method comprises the following steps that: after a liquid crystal, a photopolymerizable monomer and a photoinitiator are uniformly mixed according to a certain mass ratio, the mixture is in a clear state at a room temperature; on the basis of the siphon principle, the mixture is poured into a liquid crystal box, wherein the thickness of the liquid crystal box is controlled between 10 to 30 microns by a plastic spacer; irradiation under the ultraviolet light having the light intensity of 5 to 25 mw / cm<2> and the wavelength of 365 nm is performed for 5 to 20 minutes at a room temperature, so that a polymer dispersed liquid crystal film is formed. According to the invention, with introduction of the functional thiol monomer, the refractive index is high, the water resistance performance is excellent, the heat insulation effect is good, the oxidation resistance performance is excellent, the initiator amount is small, and the photoelectric property of the prepared PDLC film is improved substantially. Moreover, the size of the polymer mesh and the size of the liquid crystal droplet are adjusted by adjusting the mass ratio of acrylate to thiol to liquid crystal. The prepared polymer dispersed liquid crystal film has advantages of small driving voltage, highcontrast, and stable performance.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal application, and relates to a method for preparing a dimming film based on a liquid crystal / polymer composite material, in particular to a polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal, PDLC) film material method, the film material prepared can be widely used in liquid crystal display, smart glass, energy-saving building materials, automobile decoration and related fields. Background technique [0002] PDLC film is a composite material formed by uniformly dispersing nematic liquid crystal droplets in a polymer matrix. When preparing PDLC film, the mixed solution of liquid crystal and polymerized monomer is under the action of heat or light, the monomer in it undergoes polymerization reaction, the molecular weight gradually increases, and the compatibility with liquid crystal decreases, resulting in liquid crystal phase separation in the system gradually. to form micron...

Claims

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Application Information

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IPC IPC(8): G02F1/1334G02F1/13C08F220/18C08F222/14C08F2/48C08J5/18C08L33/10
CPCC08F2/48C08F220/18C08J5/18C08J2333/10C08F220/1812G02F1/1313G02F1/1334C08F222/103
Inventor 杨槐杨捷张兰英张逸
Owner PEKING UNIV
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