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Liquid crystal light adjusting film with temperature control and electric control functions and preparation method thereof

A liquid crystal dimming film and functional technology, applied in chemical instruments and methods, liquid crystal materials, optics, etc., can solve the problems that electronically controlled films cannot be intelligently dimmed, and do not have electro-optic performance

Active Publication Date: 2017-03-22
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the constraints of the currently used material system, the electronic control film cannot perform intelligent dimming like the temperature control film; and the transparent state of the temperature control film at low temperature cannot be artificially adjusted, and it does not have good performance at high temperature. The electro-optic properties of the film cannot be freely switched from the scattering state to the transparent state like the electronically controlled film.

Method used

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  • Liquid crystal light adjusting film with temperature control and electric control functions and preparation method thereof
  • Liquid crystal light adjusting film with temperature control and electric control functions and preparation method thereof
  • Liquid crystal light adjusting film with temperature control and electric control functions and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] The ratios of liquid crystals, polymerizable monomers, initiators, and spacer particles used in Example 1 are listed in Table 3. The total mass of the mixture is 1 g. Stir the samples in the table at room temperature (25°C) to form an isotropic liquid, mix evenly, and coat it between two plastic films coated with indium tin oxide (ITO) transparent conductive film. The size of the film is 5*5cm2. Roll to form a film evenly. The film is irradiated by ultraviolet light with a wavelength of 365nm at room temperature (25°C), and the intensity of ultraviolet light is 0.5mw / cm 2 , the light time is 90s, and then the film is made into an upper electrode, and a voltage of 100V with a frequency of 50Hz is applied using a transformer. At this time, the film is irradiated again with ultraviolet light with a wavelength of 365nm, and the ultraviolet light intensity is 0.5mw / cm 2 , the irradiation time is 10 min, and the liquid crystal dimming film with both temperature control and...

Embodiment 2

[0067] The ratios of liquid crystals, polymerizable monomers, ionic liquids, initiators, and glass microspheres selected in Example 2 are listed in Table 4. The total mass of the mixture is 1 g. Wherein the ionic liquid adopts a quaternary ammonium salt ionic liquid (tetrabutylammonium bromide). Stir the samples in the table at room temperature (25°C) to form an isotropic liquid, mix evenly, and coat it between two plastic films coated with indium tin oxide (ITO) transparent conductive film, the size of the film is 5*5cm 2 , Form a thin film evenly by rolling. The film is irradiated by ultraviolet light with a wavelength of 365nm at room temperature (25°C), and the intensity of ultraviolet light is 0.5mw / cm 2 , the illumination time is 90s, and then the film is made into an upper electrode, and a voltage of 100V with a frequency of 1000Hz is applied using a transformer. At this time, the film is irradiated again with ultraviolet light with a wavelength of 365nm, and the ult...

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Abstract

The invention discloses a liquid crystal light adjusting film with temperature control and electric control functions. The liquid crystal light adjusting film is characterized by comprising a macromolecular network framework and liquid crystal molecules, wherein the macromolecular network framework is composed of a polymer dispersed liquid crystal network structure and a polymer stable liquid crystal network structure; the macromolecular network framework comprises a macromolecular matrix containing mesh holes; macromolecular networks, which are vertically arrayed, are arranged in the mesh holes; the liquid crystal molecules are dispersed into the macromolecular network framework; and the liquid crystal molecules have conversion from a smectic phase to a cholesteric phase. The liquid crystal light adjusting film with the temperature control and electric control functions is a brand-new multi-response intelligent thin film and has a wide application prospect in the fields of building energy saving and the like.

Description

technical field [0001] The invention belongs to the field of functional liquid crystal materials, and in particular relates to a liquid crystal dimming film capable of temperature control and having both temperature control and electric control functions and a preparation method thereof. Background technique [0002] Polymer-dispersed liquid crystal (PDLC) electronically controlled dimming film (hereinafter referred to as "electrically controlled film") is composed of two indium tin oxide conductive films and a mixture of liquid crystal and polymer sandwiched between them. It is cured by heat or ultraviolet light. Forming (polymer / liquid crystal) composite materials. In the electric control film, the polymer forms a three-dimensional network structure, and the liquid crystal molecules fill the meshes of the three-dimensional network structure formed by the polymer. When no electric field is applied to the film, the directors of the liquid crystal molecules are randomly dist...

Claims

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Application Information

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IPC IPC(8): G02F1/1334C09K19/46C09K19/12C09K19/30
CPCC09K19/12C09K19/3003C09K19/46C09K2019/122C09K2019/123C09K2019/3004C09K2019/3016G02F1/1334G02F1/13345
Inventor 杨槐梁霄陈梅郭姝萌张兰英张翠红张慧敏胡威张逸杨婕
Owner PEKING UNIV
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