A photopolymer/liquid crystal/zinc sulfide nanocomposite holographic grating and its preparation method

A photopolymer and nano-composite technology, applied in the direction of diffraction grating, optics, optical elements, etc., can solve the problem of high driving voltage, achieve the effect of improving low-frequency conductivity and improving diffraction efficiency

Active Publication Date: 2019-09-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another challenge for the practical application of holographic polymer dispersed liquid crystal gratings is that their driving voltage is usually high ( J. Polym. Sci., Part B: Polym. Phys. , 2014, 52, 232-250)

Method used

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  • A photopolymer/liquid crystal/zinc sulfide nanocomposite holographic grating and its preparation method
  • A photopolymer/liquid crystal/zinc sulfide nanocomposite holographic grating and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0034] A photopolymer / liquid crystal / ZnS holographic nanocomposite grating with a diffraction efficiency of 96% and a driving voltage of 2.5 V / μm, in which the photopolymer content is 39 wt%, the liquid crystal 8OCB content is 60 wt%, and the average particle size is 20 nm The ZnS nanoparticles content was 1 wt%.

[0035] Its preparation method is as follows:

[0036] Acrylamide (mass fraction 20 wt%), polyethylene glycol diacrylate (mass fraction 18.5 wt%), Irgacure184 (mass fraction 0.5 wt%), liquid crystal 8OCB (mass fraction 60 wt%) and zinc sulfide nanoparticles ( Average particle size 20 nanometers, mass fraction 1 wt%) were added respectively in the brown sample bottle, ultrasonic 30 minutes under 50 ℃, obtain uniform mixed solution;

[0037] will step The prepared mixed solution is poured into a liquid crystal cell made of glass with a conductive coating, and the thickness of the liquid crystal cell is 100 microns;

[0038] Divide a beam of 365nm laser light...

Embodiment 2

[0040] A photopolymer / liquid crystal / ZnS holographic nanocomposite grating with a diffraction efficiency of 94% and a driving voltage of 2.5 V / μm, in which the photopolymer content is 61.5 wt%, the liquid crystal 7CB content is 31.5 wt%, and the average particle size is 5 nm The ZnS nanoparticles content was 8 wt%.

[0041] Its preparation method is as follows:

[0042] N,N-dimethylacrylamide (mass fraction 40 wt%), hyperbranched acrylate 6361-100 (mass fraction 20 wt%), photoinitiator 3,3′-carbonyl bis(7-diethylamine aromatic Soybean) / N-phenylglycine (mass fraction 1.5wt%), liquid crystal 7 CB (mass fraction 31.5 wt%) and zinc sulfide nanoparticles (average particle size 5 nm, mass fraction 8 wt%) were added to the brown sample bottle , ultrasonicated at 50 degrees Celsius for 30 minutes to obtain a homogeneous mixture;

[0043] will step The prepared mixed solution is poured into a liquid crystal cell made of glass with a conductive coating, and the thickness of th...

Embodiment 3

[0046] Photopolymer / LCD / ZnS holographic nanocomposite grating with a diffraction efficiency of 90% and a driving voltage of 2.2 V / μm, in which the photopolymer content is 60 wt%, the liquid crystal P01616A content is 20 wt%, and the average particle size is 100 nm The content of ZnS nanoparticles is 20wt%.

[0047] Its preparation method is as follows:

[0048] N-methylolacrylamide and methacrylamide (mass fractions were 20 wt% and 29 wt% respectively), pentaerythritol tetraacrylate (mass fraction 10 wt%), photoinitiator Rose Bengal / N-phenylglycine (mass fraction 1wt%), liquid crystal P01616A (mass fraction 20 wt%) and zinc sulfide nanoparticles (average particle diameter 100 nanometers, mass fraction 20wt%) were added in the brown sample bottle, ultrasonic 30 minutes under 50 degrees Celsius, obtained uniform the mixture;

[0049] will step The prepared mixed solution is poured into a liquid crystal cell made of glass with a conductive coating, and the thickness of ...

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Abstract

The invention belongs to the field of functional materials, and in particular relates to a photopolymer / liquid crystal / zinc sulfide nanocomposite holographic grating and a preparation method thereof. The present invention uses monofunctional acrylamide monomers, multifunctional crosslinking agents, liquid crystals, zinc sulfide nanoparticles, and photoinitiators as raw materials to prepare a mixed solution, which is poured into a liquid crystal box and exposed to light to obtain photopolymerization. The photopolymer / liquid crystal / zinc sulfide nanocomposite holographic grating has a diffraction efficiency higher than 90% and a driving voltage lower than 2.5 V / μm. It also has high diffraction efficiency and low driving voltage. The photopolymer / liquid crystal / zinc sulfide nanocomposite Gratings have broad practical application prospects in 3D display, modulated laser, photonic crystal fiber, data storage, environmental monitoring, biosensing and other fields.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a photopolymer / liquid crystal / zinc sulfide nanocomposite holographic grating and a preparation method thereof. Background technique [0002] The holographic polymer dispersed liquid crystal grating is an ordered composite material in which the polymer-rich regions and the liquid crystal-rich regions are periodically distributed. , and has a one-dimensional photonic crystal microstructure, it has broad application prospects in 3D display, modulated laser, photonic crystal fiber, data storage, environmental monitoring, biosensing and other fields. [0003] The practical application of holographic polymer dispersed liquid crystal grating is mainly determined by two technical indicators, that is, diffraction efficiency and driving voltage. How to prepare holographic polymer-dispersed liquid crystal gratings with high diffraction efficiency has always been a research h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/18G02B1/04C08F220/56C08F222/14C08F220/58
CPCG02B1/04G02B5/1857C08F220/56C08F220/58C08F222/38C08F222/385C08F222/104C08F222/102
Inventor 解孝林倪名立周兴平彭海炎陈冠楠廖永贵杨志方
Owner HUAZHONG UNIV OF SCI & TECH
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