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Method for preparing cholesteric liquid crystal functional film through ultraviolet light-heating two-step polymerization

A cholesteric liquid crystal, step-by-step polymerization technology, used in optics, nonlinear optics, instruments, etc., can solve the problems of insufficient adhesion, difficult process production, and reduced product performance and quality, and improve the interface adhesion. , the effect of enhancing network strength

Active Publication Date: 2017-01-11
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the preparation process of trans-type and bistable PDLC films, it often occurs that the adhesion between the liquid crystal / polymer composite material and the two layers of indium tin oxide (ITO) plastic films is not tight enough to cause the ITO plastic film to detach. This has brought great difficulties to large-scale process production, which not only reduces the performance and quality of products, but also seriously affects the economic benefits of products.

Method used

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  • Method for preparing cholesteric liquid crystal functional film through ultraviolet light-heating two-step polymerization
  • Method for preparing cholesteric liquid crystal functional film through ultraviolet light-heating two-step polymerization
  • Method for preparing cholesteric liquid crystal functional film through ultraviolet light-heating two-step polymerization

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Experimental program
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Effect test

Embodiment 1

[0043] 1 wt% thermally polymerized polymer monomer (compound 1 and 4,4'-diaminodicyclohexylmethane in epoxy monomer) was mixed with 99 wt% cholesteric liquid crystal mixture (cholesteric The phase liquid crystal mixture contains 10% by weight of chiral additive S811, and the others are HNG726200-100, produced by Jiangsu Hecheng Display Technology Co., Ltd., Tc=101°C) and uniformly mixed as a thermally polymerized monomer liquid crystal composite system. 3,5,5-trimethylhexyl acrylate, isopropyl methacrylate, 1,4-butanediol diacrylate, and polyethylene glycol diacrylate 600 in a mass ratio of 1:1:2: 1. Mix evenly. As an ultraviolet polymerization monomer composite system, uniformly mix 20wt% of the ultraviolet polymerization monomer composite system with 80wt% of the thermal polymerization monomer liquid crystal composite system to form an isotropic liquid at a temperature of 55°C. A photoinitiator is added to the isotropic liquid to form a mixed system, and the content of the p...

Embodiment 2

[0046] 3wt% thermally polymerized polymer monomer (compound 2 and 4,4'-diaminodicyclohexylmethane in epoxy monomer) was mixed with 97wt% cholesteric liquid crystal mixture (cholesteric The phase liquid crystal mixture contains the chiral additive S811 of 10% by weight, and the others are nematic phase liquid crystal mixtures (shown in Table 1), which contain I, II, III, IV, V, VI and VII compounds) uniformly mixed , as a thermopolymerizable monomer liquid crystal composite system. Mix 3,5,5-trimethylhexyl acrylate, lauryl acrylate, 1,4-butanediol diacrylate, and polyethylene glycol diacrylate 600 in a mass ratio of 1:1:2:1 Uniform, as the ultraviolet polymerization monomer composite system, 10wt% of the ultraviolet polymerization monomer composite system and 90wt% of the thermal polymerization monomer liquid crystal composite system are uniformly mixed to form an isotropic liquid at a temperature of 70°C. A photoinitiator is added to the isotropic liquid to form a mixed syste...

Embodiment 3

[0052] 4 wt% of thermally polymerizable monomers (compound 10 and 4,4'-diaminodicyclohexylmethane in epoxy monomer) were mixed with 96 wt% of cholesteric liquid crystal mixture (cholesteric The phase liquid crystal mixture contains the chiral additive CB15 of 10% by weight, and the others are nematic phase liquid crystal mixtures (shown in Table 1), which contain I, II, III, IV, V, VI and VII compounds) uniformly mixed , as a thermopolymerizable monomer liquid crystal composite system. 3,5,5-trimethylhexyl acrylate, lauryl acrylate, 3-(trimethoxysilyl)propyl acrylate, and polyethylene glycol diacrylate 600 in a mass ratio of 1:1:2: 1. Mix evenly. As an ultraviolet polymerization monomer composite system, 15wt% of the ultraviolet polymerization monomer composite system and 85wt% of the thermal polymerization monomer liquid crystal composite system are uniformly mixed to form an isotropic liquid at a temperature of 0°C. A photoinitiator is added to the isotropic liquid to form ...

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Abstract

The invention discloses a method for preparing trans-or bistable polymer dispersed liquid crystal PDLC film through ultraviolet light-heating two-step polymerization. The method includes: evenly mixing a cholesteric liquid crystal mixture, ultraviolet polymerizable monomers, a photoinitiator, thermal polymerization monomers and glass beads, arranging the mixture between two transparent conductive films coated with indium tin oxide, and using a roller to press the mixture with the two transparent conductive films; performing ultraviolet-curing, forming a multi-domain liquid crystal micro area after phase separation is triggered by ultraviolet polymerization; allowing cholesteric liquid crystal in the micro area to be orientated in parallel under the action of an electric field, performing heating-curing so as to form a liquid crystal micro area with stable polymer in the micro area, and finally curing the liquid crystal micro area into the trans-or bistable PDLC film. According to the trans-or bistable PDLC film prepared by the method, the polymer macromolecule network structure can be controlled through allocation of the ultraviolet polymerizable monomers and the thermal polymerization monomers, the electro-optical performance of the PDLC film can be improved, the binding power between a liquid crystal / polymer composite material and two ITO plastic films is enhanced, and the heat stability of the trans-or bistable PDLC film can be improved.

Description

technical field [0001] The invention belongs to the field of functional materials, in particular to a method for preparing a cholesteric liquid crystal functional film through ultraviolet light-heating stepwise polymerization. Background technique [0002] Smart glass is a kind of glass whose optical properties such as transmittance, reflectance or color can be adjusted by electric field, temperature, magnetic field, etc. Polymer dispersed liquid crystals (Polymer dispersed liquid crystals, PDLC) film is a liquid crystal / polymer composite electro-optic material. PDLC is used in the field of electronically controlled smart glass, and the glass can be switched between transparent and opaque states by adjusting the external electric field. Electronically controlled smart glass has the advantages of energy saving, environmental protection, privacy protection, safety, sound insulation, and convenient regulation. It can be widely used in the sunroof of Mercedes-Benz, BMW and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1334C08F220/18
CPCC08F220/18C08F220/1806G02F1/1334G02F1/13345C08F220/1803C08F222/14
Inventor 杨槐王慧慧张翠红王茜陈梅郭姝萌粱霄周乐胡威
Owner PEKING UNIV
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