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Preparation method of polymer mixed network-based polymer dispersed liquid crystal (PDLC) film material

A technology of dispersing liquid crystals and hybrid networks, applied in the field of preparation of UV-induced polymerization-induced phase separation (PIPS), to overcome volume shrinkage, increase polymerization strength, and improve photoelectric performance

Inactive Publication Date: 2012-06-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] During the preparation of PDLC films, it often occurs that the adhesion between the polymer network / liquid crystal composite film and the two layers of ITO plastic films is not tight enough, which easily leads to When the ITO plastic film falls off
These have brought great difficulties to large-scale PDLC film 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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  • Preparation method of polymer mixed network-based polymer dispersed liquid crystal (PDLC) film material
  • Preparation method of polymer mixed network-based polymer dispersed liquid crystal (PDLC) film material
  • Preparation method of polymer mixed network-based polymer dispersed liquid crystal (PDLC) film material

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Embodiment 1

[0036] The selected UV-polymerizable epoxy monomer is polyethylene glycol diglycidyl ether (EGDE, =3 and 10), and two monomers with different chain lengths are mixed evenly at a mass ratio of 10:1 to form a UV Cationic polymerization monomer system; the selected UV-polymerizable acrylate (or methacrylate) monomers are lauryl methacrylate (LMA) and 1,4-butanediol diacrylate (BDDA). The two monomers are uniformly mixed at a mass ratio of 4:1 to form a UV radical polymerization monomer system. The above-mentioned UV-polymerizable cationic and radical-polymerizable monomer systems were mixed at a mass ratio of 6:1, and the mixed system was used as a UV-polymerizable monomer. The nematic phase liquid crystal that the present invention selects is SLC1717 (T NI =365.2K, n o =1.519, n e=1.720), and the mass ratio of the above-mentioned mixed ultraviolet light polymerization monomer system and liquid crystal is 3:2, and the isotropic liquid is formed at room temperature (20°C). Add...

Embodiment 2

[0041] The selected UV-polymerizable epoxy monomer is polyethylene glycol diglycidyl ether (EGDE, =3 and 10), and two monomers with different chain lengths are mixed evenly at a mass ratio of 10:1 to form a UV Cationic polymerization monomer system. The nematic phase liquid crystal that the present invention selects is SLC1717 (T NI =365.2K, n o =1.519, n e =1.720), and the above-mentioned UV cationic polymerization monomer system and liquid crystal are mixed uniformly at a mass ratio of 3:2 to form an isotropic liquid at room temperature (20°C). A cationic photoinitiator (UVI-6976) was added at 5.0wt% of the total mass, and 20 μm glass beads were added to control the thickness of the PDLC film. The content of glass beads was 0.5wt% of the total mass of the mixed system. After mixing the liquid crystal, ultraviolet cationic polymerization monomer, photoinitiator and glass microspheres evenly, it is coated on the middle of two plastic films coated with indium tin oxide (ITO)...

Embodiment 3

[0045] The selected UV-polymerizable acrylate (or methacrylate) monomers are lauryl methacrylate (LMA) and 1,4-butanediol diacrylate (BDDA). Mix evenly at a ratio of 4:1 to form a UV radical polymerization monomer system. The nematic phase liquid crystal that the present invention selects is SLC1717 (T NI =365.2K, n o =1.519, n e =1.720), and the mass ratio of the above-mentioned ultraviolet light radical polymerization monomer system and liquid crystal is 3:2, and the isotropic liquid is formed at room temperature (20°C). Add 5.0wt% of the total mass of free radical photoinitiator (TPO), and add 20 μm glass beads to control the thickness of the PDLC film. The content of glass beads is 0.5wt% of the total mass of the mixed system. After mixing the liquid crystal, ultraviolet radical polymerization monomer, photoinitiator and glass beads evenly, it is coated on the middle of two plastic films coated with indium tin oxide (ITO) transparent conductive film, and the film is uni...

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Abstract

The invention belongs to the technical field of liquid crystal application and especially relates to a preparation method of a polymer mixed network-based polymer dispersed liquid crystal (PDLC) film material. The preparation method of the polymer mixed network-based PDLC film material is characterized in that one or more ultraviolet light polymerisable epoxy monomers, an ultraviolet light polymerisable acrylate (or methacrylate) monomer, nematic liquid crystals, a cationic photoinitiator, a free radical photoinitiator and glass beads are uniformly mixed according to a certain mass ratio; the mixture is coated between two transparent indium tin oxid (ITO) conductive plastic films and then is pressed into films having different thickness values; and the films are irradiated by ultraviolet lights having wavelength of 365nm to be cured into the polymer mixed network-based PDLC film material. The polymer mixed network-based PDLC film material obtained by the preparation method has the advantages belonging to an acrylate or methacrylate network-based PDLC film and an epoxy resin network-based PDLC film. The preparation method improves the cohesion between a polymer network and an ITO plastic film interface, and improves the stability of the polymer mixed network-based PDLC film material.

Description

[0001] technical field [0002] The invention belongs to the field of liquid crystal application technology, and in particular provides a method for preparing a UV-induced polymerization-induced phase separation (PIPS) based on a polymer mixed network polymer dispersed liquid crystal (PDLC) film material. The prepared film material can be widely used In the research of liquid crystal display, smart glass and related fields. [0003] Background technique [0004] With the development of industry, energy shortage and air pollution have become problems that we have to face up to. The concentration of carbon dioxide in the atmosphere rises rapidly, causing the greenhouse effect, global warming, acid rain, smog, or climate change. Although oil and coal have brought prosperity to the world economy, they will eventually run out. Under such circumstances, the sustainable development of energy, reducing the consumption of natural resources as much as possible, and reducing the em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/22C08F220/18C08F222/14C08F2/48C08K7/20C08L63/00C08L33/10G02F1/1334
Inventor 杨槐宋平曹晖王菲菲刘芳王静静
Owner UNIV OF SCI & TECH BEIJING
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