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

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...

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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 plastic film to detach, which brings serious problems to large-scale process production. It is very difficult, which not only reduces the performance and quality of the product, but also seriously affects the economic benefits of the product.

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