Polymer dispersed liquid crystal (PDLC) membrane preparation method and PDLC membrane

Abstract

The invention discloses a preparation method of a polymer dispersed liquid crystal (PDLC) membrane material and the prepared PDLC membrane. The preparation method comprises the steps that polymerizable monomers and a liquid crystal material are mixed according to the mass ratio of (3:7) to (7:3), and an ultraviolet initiating agent is added, wherein the ultraviolet initiating agent accounts for 3-5% of the total mass of the polymerizable monomers, and the adopted liquid crystal material is matched with the selected polymerizable monomers in refractive index; and a mixture is poured into a liquid crystal cell and irradiated under ultraviolet light, and thus the PDLC membrane is prepared. The adopted polymerizable monomers are not prone to volatizing, low in toxicity and small in irritation;a system is high in stability and easy to preserve; through a polymerization crosslinking reaction of ultraviolet light and acrylate and mercaptan monomers, a formed polymer matrix has a unique composite structure, namely, the composite structure is provided with the dense surface and a hole-type internal structure with attached microspheres, the polymer matrix is good in toughness, fast in deformation recovery and good in stability, the electro-optical performance of the PDLC membrane is greatly improved, and thus the PDLC membrane has the lower driving voltage, the high response speed and the high contrast.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal application, and in particular relates to a method for preparing a polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal, PDLC) film material based on an acrylate-thiol ultraviolet light curing system and the polymer dispersed liquid crystal film. Dispersed liquid crystal film can be widely used in liquid crystal display, smart glass and related fields. Background technique [0002] Polymer Dispersed Liquid Crystal (hereinafter referred to as PDLC) is a composite material formed by uniformly dispersing liquid crystal droplets in a polymer matrix. Because of its special electro-optic response performance, it has become a research hotspot in the field of flat panel display. PDLC has the advantages of high contrast, simple preparation, and no need for polarizers. Therefore, PDLC film materials have broad application prospects in smart glass, tunable filters, scattering polarizers,...

AI Technical Summary

Problems solved by technology

Usually, the vast majority of UV-polymerized monomer systems generally choose acrylate monomers as diluents to adjust the viscosity and reaction rate of the system, but these diluents have the disadvantages of being volatile, highly toxic, and irritating. , so the problem of environmental pollution caused by use is difficult to overcome, and its use has been restricted in some countries. It is an urgent problem to seek a low toxicity and low irritation diluent monomer

Moreover, the polymer matrix of today's PDLC films mostly has only a single mesh structure, which has greatly limited the improvement of its performance.

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