Method for preparing polymer dispersion liquid crystal material by ultraviolet-heating step-polymerization process

A technology of dispersing liquid crystal and step-by-step polymerization, used in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as insufficient adhesion, detachment of ITO plastic film, and impact on product economic benefits.

Active Publication Date: 2008-07-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the process of preparing electronically controlled smart glass, it often occurs that the adhesion between the liquid crystal/polymer composite material and the two layers of ITO plastic film is not tight enough to cause the ITO pl

Method used

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  • Method for preparing polymer dispersion liquid crystal material by ultraviolet-heating step-polymerization process
  • Method for preparing polymer dispersion liquid crystal material by ultraviolet-heating step-polymerization process
  • Method for preparing polymer dispersion liquid crystal material by ultraviolet-heating step-polymerization process

Examples

Experimental program
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Embodiment 1

[0031] Tripropylene glycol diacrylate (TPGDA) containing acrylate functional groups and pentaerythritol triacrylate (PETA) were mixed uniformly in a mass ratio of 2:1 as a UV-polymerizable monomer; DGEBA containing conjugated epoxy groups Epoxy resin and Jeffamine D-400, an aliphatic amine epoxy curing agent, were uniformly mixed at a mass ratio of 1:1 as a UV-polymerizable monomer. The above-mentioned ultraviolet light polymerizable monomer and thermal polymerizable monomer are mixed in a mass ratio of 1.5:1, and the mixed system is used as a polymerizable monomer. The above two polymerizable monomeric materials were obtained from commercially available products without further purification. The nematic liquid crystal selected in the present invention is SLC1717 (Shijiazhuang Yongsheng Huaqing Liquid Crystal Co., Ltd., Tc=92° C.). The nematic liquid crystal and the above-mentioned compounded polymerizable monomer are uniformly mixed at a mass ratio of 7:3, and an isotropic l...

Embodiment 2

[0037]The nematic liquid crystal in embodiment 1, ultraviolet light polymerizable monomer, photoinitiator, thermopolymerizable monomer and nano microbead are uniformly mixed, after the ultraviolet light polymerization process identical with embodiment 1, the sample obtained Put it into an oven, the heating temperature is 90° C., and the heating time is 6 hours. After the sample is cooled to room temperature in the air, the PDLC film of Example 2 is obtained.

Embodiment 3

[0039] The nematic liquid crystal in embodiment 1, ultraviolet light polymerizable monomer, photoinitiator, thermopolymerizable monomer and nano microbead are uniformly mixed, after the ultraviolet light polymerization process identical with embodiment 1, the sample obtained Put it into an oven, the heating temperature is 90° C., and the heating time is 8 hours. After the sample is cooled to room temperature in the air, the PDLC film of Example 3 is obtained.

[0040] The experimental results show that the electro-optic properties of the PDLC films in Examples 2-3 are not much different from those of the PDLC films prepared in Example 1. This also shows that in the above examples, when the thermal polymerization process is heated for 5 hours, the reaction between the epoxy resin and the aliphatic amine epoxy curing agent is basically completed.

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Abstract

The invention in particular relates to a preparation method of polymer dispersing liquid crystal film by an ultraviolet irradiating-heating plus stepwise initiated polymerization and phase separation method, belonging to the functional material field, which is applied in the preparation of electric controlled intelligent glass. The preparation method is characterized in that: the nematic liquid crystal, the monomer which can be polymerized under ultraviolet light, the light initiator, the thermal polymerized monomer and the glass microsphere is blended and then are clipped between two pieces of transparent conductive film plated with indium tin oxide, and then film with the thickness of 20 Mum if formed and is irradiated by the ultraviolet light with the wavelength of 365nm at 0 to 25 degrees; the intensity of the ultraviolet light is 20.0mW/m<2> and the illumination time is 1 to 10 minutes; the thermal polymerization temperature is 60 to 100 degrees, the holding time is 5 to 8 hours, at last the PDLC film is prepared by solidification. The polymer dispersing liquid crystal film has the advantages that: because of the stepwise polymerization crosslinking reaction which is carried out by selecting the monomer polymerized by ultraviolet and thermal polymerized monomer and irradiating and heating under ultraviolet light, the electro-optic performance the PDLC film is improved, the network strength of the polymer is enhanced, meanwhile, the bonding force of the interface between the polymer network and the ITO film are reinforced.

Description

technical field [0001] The invention belongs to the field of functional materials, in particular to a method for preparing a polymer dispersed liquid crystal (PDLC) film by adopting an ultraviolet light irradiation-heating step-by-step initiation polymerization phase separation (PIPS) method, and applying it to a preparation method of electronically controlled smart glass . 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. The polymer dispersed liquid crystal (Polymer dispersed liquid crystals, PDLC) film used in the present invention is a liquid crystal / polymer composite electro-optical 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 advantage...

Claims

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Application Information

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IPC IPC(8): C09K19/38C08J5/18C08F220/10C08F2/48C08L33/08C08K7/20
Inventor 杨槐丁小康曹明尹聿海李博夫刘会景边震宇孙婕曹晖海明潭李文波
Owner UNIV OF SCI & TECH BEIJING
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