Nanoparticle-doped polymer dispersed liquid crystal thin film and preparation method thereof

A technology for dispersing liquid crystals and nanoparticles, applied in the directions of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of performance improvement limitation, single mesh structure, strong irritation, etc., achieve good electro-optic performance, low viscosity, Low volatility effect

Active Publication Date: 2019-02-12
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the vast majority of UV-polymerized monomer systems generally choose acrylate monomers as diluents to adjust the viscosity and reaction rate of the system, but these diluents have the disadvantages of being volatile, highly toxic, and irritating. , so the problem of environmental pollution caused by use is difficult to overcome, and its use has been restricted in some countries
Nowadays, seeking a low-toxicity and low-irritation diluent monomer has become an urgent problem to be solved; most of the polymer matrix of the current PDLC film has only a single mesh structure, which has greatly limited the improvement of its performance.

Method used

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  • Nanoparticle-doped polymer dispersed liquid crystal thin film and preparation method thereof
  • Nanoparticle-doped polymer dispersed liquid crystal thin film and preparation method thereof
  • Nanoparticle-doped polymer dispersed liquid crystal thin film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0065] The polymer dispersed liquid crystal system and the ITO nanoparticles modified by KH570 are mixed according to the mass ratio of 95:5. The polymer dispersed liquid crystal system is: the polymerizable monomer and the liquid crystal are mixed according to the mass ratio of 1:1, wherein The mass ratio of each monomer of the polymerized monomer is LMA:HPMA:PEGDA200:TTMP=2:3:4:1, and the ultraviolet photoinitiator 651 accounting for 5% of the mass of the polymerizable monomer is added, and the liquid crystal material used is the same as that used Nematic liquid crystal SLC1717 whose refractive index matches the selected polymerizable monomer; after stirring evenly, pour the mixed system into a liquid crystal box made of two pieces of conductive glass coated with indium tin oxide (ITO) to control the liquid crystal The thickness between the two pieces of ITO conductive glass in the box is about 20μm; at the temperature of 273K, the filled liquid crystal box will have a wavele...

Embodiment 2

[0069] Mix the polymer dispersed liquid crystal system and the 200nm ITO nanoparticles modified by KH570 according to the mass ratio of 85:15. The polymer dispersed liquid crystal system is: mix the polymerizable monomer and the liquid crystal according to the mass ratio of 1:1, Wherein the mass ratio of each monomer of the polymerizable monomer is LMA:HPMA:PEGDA200:TTMP=2:3:4:1, and the ultraviolet photoinitiator 651 accounting for 5% of the polymerizable monomer mass is added, and the liquid crystal material used is Nematic liquid crystal SLC 1717 matching the refractive index of the selected polymerizable monomer; after stirring evenly, pour the mixed system into a liquid crystal cell made of two pieces of conductive glass coated with indium tin oxide (ITO) , to control the thickness between the two pieces of ITO conductive glass of the liquid crystal cell to be about 20 μm; at the temperature of 273K, the liquid crystal cell that has been filled will have a wavelength of 36...

Embodiment 3

[0072] Mix the polymer-dispersed liquid crystal system and the ITO nanoparticles modified by KH580 at a mass ratio of 85:15. The polymer-dispersed liquid crystal system is: mix the polymerizable monomer and liquid crystal at a mass ratio of 1:1, wherein The mass ratio of each monomer of the polymerized monomer is LMA:HPMA:PEGDA200:TTMP=2:3:4:1, and an ultraviolet photoinitiator 651 accounting for 5% of the polymerizable monomer mass is added, and the liquid crystal material used is the same as that used Nematic liquid crystal SLC 1717 whose refractive index matches the selected polymerizable monomer; after stirring evenly, pour the mixed system into a liquid crystal box made of two pieces of conductive glass coated with indium tin oxide (ITO), and control The thickness between the two pieces of ITO conductive glass of the liquid crystal cell is about 20 μm; at the temperature of 273K, the filled liquid crystal cell has a wavelength of 365nm and a light intensity of 10mW / cm 2 U...

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Abstract

The invention discloses a nanoparticle-doped polymer dispersed liquid crystal (PDLC) thin film and a preparation method thereof. A driving voltage V<sat> and contrast ratio CR of the thin film are adjusted by adjusting a mesh size of a polymer network, the transmittance T of near-infrared band of the thin film is adjusted by adjusting doping quantity of nanoparticle, the driving voltage of the PDLC thin film can be reduced by appropriate doping of the nanoparticle, so that the thin film which has excellent photoelectric performance and can be used for shielding infrared ray and ultraviolet rayis obtained, an atomized scattering state is converted to a transparent state under a relatively low voltage, and the thin film has wide application prospect in the correlated field of liquid crystaldisplay, intelligent glass, energy-saving building materials and automobile decoration.

Description

technical field [0001] The invention belongs to the field of optical thin film technology and the field of nanotechnology, in particular to a preparation of polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal, PDLC) based on an acrylate-thiol ultraviolet light curing system and a preparation method thereof. The prepared film material can be widely used It is used in liquid crystal display, smart glass, energy-saving building materials, automobile decoration and related fields. Background technique [0002] Polymer Dispersed Liquid Crystal (hereinafter referred to as PDLC) is a composite material formed by uniformly dispersing liquid crystal droplets in a polymer matrix. Because of its special electro-optic response performance, it has become a research hotspot in the field of flat panel display. PDLC has the advantages of high contrast, simple preparation, and no need for polarizers, so PDLC film materials are used in smart glass, tunable filters, scattering p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1334C09K19/56
CPCC09K19/56G02F1/1334G02F1/13345
Inventor 杨槐张逸张翠红张兰英李发胜
Owner PEKING UNIV
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