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A kind of preparation method of trans polymer dispersed liquid crystal film

A technology for dispersing liquid crystals and polymers, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve problems such as difficulties in process production, affecting product economic benefits, and reducing product performance and quality

Active Publication Date: 2018-10-02
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And it is mainly prepared by ultraviolet polymerization, and the adhesion between the film and the substrate is insufficient, which brings great difficulties to large-scale process production, not only reduces the performance and quality of the product, but also seriously affects the economic benefits of the product

Method used

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  • A kind of preparation method of trans polymer dispersed liquid crystal film
  • A kind of preparation method of trans polymer dispersed liquid crystal film
  • A kind of preparation method of trans polymer dispersed liquid crystal film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The liquid crystalline ultraviolet light polymerizable monomer (compound 1) that is 1wt% by weight and the negative nematic phase liquid crystal mixture that is 99wt% by weight (select the composition of negative nematic phase liquid crystal mixture in the present invention as shown in Table 1 ) and the photoinitiator Irgacure651 are evenly mixed, as the UV polymerizable monomer liquid crystal composite system, the addition of the photoinitiator is 5% of the total mass of the liquid crystal UV polymerizable monomer and the nematic liquid crystal mixture; the weight percentage is 50% of polythiol type curing agent Capcure 3-800 is mixed with 50% by weight of E51 epoxy resin / glycidyl ester ERL-4221 epoxy resin containing conjugated epoxy groups, as a thermal polymerization compound system; the thermal polymerization composite system and the ultraviolet polymerizable monomer liquid crystal composite system are uniformly mixed at a mass ratio of 2:8 to form an isotropic liqu...

Embodiment 2

[0062] The liquid crystalline ultraviolet light polymerizable monomer (compound 2) that is 3wt% by weight and the negative nematic phase liquid crystal mixture that is 97wt% by weight (the composition of the negative nematic phase liquid crystal mixture selected in the present invention is as shown in Table 1 Shown) and the photoinitiator Irgacure651 are evenly mixed, as the ultraviolet polymerizable monomer liquid crystal composite system, the addition amount of the photoinitiator is 0.01% of the total mass of the liquid crystal ultraviolet photopolymerizable monomer and the nematic liquid crystal mixture; 20% polythiol type curing agent Capcure 3-800 and 80% by weight thermal polymerizable monomer (compound a) are uniformly mixed as thermal polymer composite system; thermal polymer composite system and UV polymerizable monomer liquid crystal The composite system is uniformly mixed at a mass ratio of 6:4, and forms an isotropic liquid at a temperature of 60°C. A thermal curin...

Embodiment 3

[0065] The liquid crystal ultraviolet light polymerizable monomer (compound 3) that is 4wt% by weight and the negative nematic phase liquid crystal mixture that is 96wt% by weight (the composition of the negative nematic phase liquid crystal mixture selected in the present invention is as shown in Table 1 Shown) and the photoinitiator Irgacure651 are evenly mixed, as the ultraviolet polymerizable monomer liquid crystal composite system, the addition amount of the photoinitiator is 6% of the total mass of the liquid crystal ultraviolet photopolymerizable monomer and the nematic liquid crystal mixture; 40% polythiol type curing agent Capcure 3-800 and 60% by weight thermally polymerizable monomer (compound b) are uniformly mixed as a thermally polymerizable composite system; The composite system is uniformly mixed at a mass ratio of 5:5, and forms an isotropic liquid at a temperature of 70°C. A thermal curing accelerator is added to the isotropic liquid to form a mixed system, a...

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Abstract

The invention discloses a preparation method of a trans polymer-dispersed liquid crystal (PDLC) film. The method consists of: mixing a negative nematic liquid crystal mixture, a liquid crystal ultraviolet polymerizable monomer, a photoinitiator, a thermal polymerization monomer and glass beads evenly, then clamping the mixture between two transparent conductive films plated with indium tin oxide, rolling the materials evenly, first conducting thermocuring, after complete polymerization, performing parallel orientation on the nematic liquid crystal by means of a high-frequency electric field, at the same time conducting ultraviolet irradiation, and performing curing to obtain a trans PDLC film. The method provided by the invention can improve the electro-optical properties of the trans PDLC film, enhance the bonding force between a liquid crystal / high polymer composite material and two layers of ITO plastic films, and improve the thermal stability of the trans PDLC film.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal applications, and in particular provides a method for preparing a transpolymer-dispersed liquid crystal film. The prepared film can be widely used in liquid crystal display, smart glass and related fields. Background technique [0002] Polymer dispersed liquid crystal film (PDLC) is a three-dimensional network structure formed by filling liquid crystal molecules in polymers. When no electric field is applied, the directors of liquid crystal molecules are randomly distributed, and the film is in a state of strong light scattering; under the action of an electric field , the long axes of the liquid crystal molecules are aligned parallel to the electric field, and the film is transparent. The electro-optical performance characteristics of the trans PDLC film are: when no electric field is applied to the film, the film is in a transparent state; when an electric field is applied to the film, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1334C09K19/52
Inventor 杨槐王慧慧陈梅王茜张翠红郭姝萌粱霄周乐胡威
Owner PEKING UNIV
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