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Polymer dispersed liquid crystal film with electromagnetic recognition function and preparation method thereof

A technology for dispersing liquid crystals and polymers. It is used in electrical/magnetic exploration, chemical instruments and methods, and electronic equipment. It can solve the problems of slow response time, high driving voltage, and long response time, and achieve improved contrast and high transparency. Over-rate, low-cost effect

Active Publication Date: 2021-06-22
XIJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, polymer-dispersed liquid crystal film products still have defects such as slow response time, high driving voltage, and relatively low contrast. The application in display is limited to a certain extent. Related products are not sensitive to electromagnetic signal recognition, and the response time is relatively long. Shortcomings

Method used

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  • Polymer dispersed liquid crystal film with electromagnetic recognition function and preparation method thereof
  • Polymer dispersed liquid crystal film with electromagnetic recognition function and preparation method thereof
  • Polymer dispersed liquid crystal film with electromagnetic recognition function and preparation method thereof

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preparation example Construction

[0044] The invention provides a polymer-dispersed liquid crystal film with electromagnetic recognition function, which comprises a polyimide transparent film containing nano-copper wires, a liquid crystal layer containing an ultraviolet absorber and a polymer network, and two sides containing The polyimide transparent film of nanometer copper wire, its preparation method specifically comprises the following steps:

[0045] First, the preparation of polyimide transparent film

[0046] Mix 20-40g of biphenyltetracarboxylic dianhydride and 2-16g of p-phenylenediamine, then add 300-600mL of dry p-chlorophenol solvent, stir at a speed of 300-1200r / min for 20-60min, and then heat up To 150-300 ℃, reflux reaction for 3-5 hours to obtain polyimide solution; perform salivation film formation on the substrate, the process controls the volatilization temperature at 10-70 ℃, removes the solvent, and obtains a colorless polyimide transparent film;

[0047] Second, prepare a polyimide tran...

Embodiment 1

[0063] This embodiment provides a polymer-dispersed liquid crystal film with electromagnetic recognition function and its preparation method. From top to bottom, it is a polyimide transparent film containing nano-copper wires on the lower side, and a liquid crystal containing an ultraviolet absorber and a polymer network. A polyimide transparent film containing nanometer copper wires on both sides, specifically comprising the following steps:

[0064] First, the preparation of polyimide transparent film

[0065] Mix 20g of biphenyltetracarboxylic dianhydride and 10g of p-phenylenediamine, then add 300mL of dry p-chlorophenol solvent, stir at a speed of 300r / min for 20min, then raise the temperature to 150°C, and reflux for 3h to obtain polyamide Imine solution; perform salivation film formation on the substrate, the process controls the volatilization temperature at 10°C, removes the solvent, and obtains a colorless polyimide transparent film;

[0066] Second, prepare a polyi...

Embodiment 2

[0081] This embodiment provides a polymer-dispersed liquid crystal film with electromagnetic recognition function. From top to bottom, it is a polyimide transparent film containing nano copper wires, a liquid crystal layer containing an ultraviolet absorber and a polymer network, Both sides contain the polyimide transparent film of nanometer copper wire, and its preparation method specifically comprises the following steps:

[0082] First, the preparation of polyimide transparent film

[0083] Mix 30g of biphenyltetracarboxylic dianhydride and 6g of p-phenylenediamine, then add 400mL of dry p-chlorophenol solvent, stir at a speed of 500r / min for 40min, then raise the temperature to 200°C, and reflux for 4h to obtain polyamide Imine solution; perform salivation film formation on the substrate, the process controls the volatilization temperature at 30°C, removes the solvent, and obtains a colorless polyimide transparent film;

[0084] Second, prepare a polyimide transparent fil...

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Abstract

The invention discloses a polymer dispersed liquid crystal film with an electromagnetic recognition function and a preparation method thereof, and the film sequentially comprises a polyimide transparent film containing copper nanowires at the lower side, a liquid crystal layer containing an ultraviolet absorbent and a polymer network, and a polyimide transparent film containing copper nanowires at two sides from top to bottom, the three layers of nano copper wires contained in the polymer dispersed liquid crystal film are etched by laser to form copper wire grids which can amplify external electromagnetic signals, so that the film has an electromagnetic recognition function and can release electric signals according to changes of an external electric field and a magnetic field, and the lower liquid crystal layer can correspondingly deflect according to changes of the electric signals; the photoelectric property of the thin film is more excellent, a step-by-step polymerization cross-linking reaction of a polymerization system is initiated through ultraviolet irradiation and heating in a dual polymerization mode of thermal polymerization and ultraviolet polymerization, the electro-optical property of the thin film is improved, the strength of a polymer network is enhanced, and the interface bonding force between the polymer network and the liquid crystal thin film is improved.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal display, and in particular relates to a polymer dispersed liquid crystal film with electromagnetic recognition function and a preparation method thereof. Background technique [0002] In recent years, liquid crystals have been widely used as display materials in various display devices, such as computers, mobile phones, and large-screen displays. Polymer Dispersed Liquid Crystal (PDLC), as a new type of functional liquid crystal composite material, has attracted the attention of many researchers. In the PDLC film, it can ensure that the liquid crystal droplets are distributed in the polymerized monomer on the order of nanometers or micrometers, and show two states of transparency and scattering through the switching effect of the electric field. Polymer-dispersed liquid crystal displays have many advantages, such as simple preparation process, no need for polarizers and alignment layers, a...

Claims

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Application Information

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IPC IPC(8): B32B27/06B32B27/18B32B27/28B32B33/00B32B37/06B32B37/10B32B38/00C08J7/06C08J5/18C08L79/08C08L29/10C08L33/02C08K5/3475C08K5/3492C08K3/04C08F2/48G01V3/08
CPCB32B27/281B32B27/06B32B27/18B32B33/00B32B37/06B32B37/10B32B38/0008C08J7/06C08J5/18C08L29/10C08F2/48G01V3/08B32B2307/20B32B2307/40B32B2307/558B32B2457/202C08J2379/08C08L33/02C08K5/3475C08K5/3492C08K3/041
Inventor 王冬时祖辉赵玉真苗宗成贺泽民赵阳康小希
Owner XIJING UNIV
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