Polymer dispersed liquid crystal film and preparation method thereof

A technology for dispersing liquid crystals and polymers, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of difficult to effectively control the driving voltage and contrast, and the inability to effectively control the structure and molecular weight of the polymer matrix, and achieve high-efficiency room temperature activity. Free radical polymerization, avoid UV damage to human body, improve the effect of open light transmittance

Active Publication Date: 2013-01-30
SHENZHEN DALTON ELECTRONICS MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Free radical polymerization is a common method for preparing PDLC films, but the PDLC films prepared by traditional free radical polymerization methods cannot effectively control the structure and molecular weight of the polymer matrix, making it difficult to effectively control the driving voltage and contrast.

Method used

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  • Polymer dispersed liquid crystal film and preparation method thereof
  • Polymer dispersed liquid crystal film and preparation method thereof
  • Polymer dispersed liquid crystal film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a. Mix 15 parts of 4-methoxystyrene (MOSt), 0.023 parts of azobisisobutyronitrile (Tianjin Damao Chemical Reagent Factory, analytically pure), 0.225 parts of S, S'-di(α,α'- Dimethyl-α''-acetic acid)-trithiocarbonate [self-made in the laboratory, the steps are as follows: install mechanical stirring on a four-necked round-bottomed flask adding 1.4 g of tetradecyltrimethylammonium bromide, condensing tube, thermometer and constant pressure funnel, add carbon disulfide (15.6 g, 0.20 mol), acetone (29.0 g, 0.50 mol), chloroform (53.8 g, 0.45 mol) and petroleum ether (60 mL) after deoxygenation, and cool in an ice-water bath. Nitrogen gas was passed through the mixture for 15 min, and 50% sodium hydroxide solution (101.0 g, 1.26 mol) pre-cooled to about 10 °C was added dropwise, and the reaction temperature was maintained at 15-20 °C and stirred overnight. Pour the orange-red slurry reaction mixture into a flask filled with 400 mL of distilled water, separate the water phase...

Embodiment 2

[0029] Embodiment 2 Molecular weight of macromolecular reagent

[0030] According to the method in Example 1, the macromolecular reagent RAFT-PMOSt was synthesized and a PDLC film was fabricated. The preparation ratio and photocuring process of the photosensitive solution are the same as in Example 1, except that the formula for synthesizing the macromolecular reagent RAFT-PMOST is: 15 parts of 4-methoxystyrene, 0.034 parts of azobisisobutyronitrile, S, S'- 0.26 parts of bis(α,α'-dimethyl-α''-acetic acid)-trithiocarbonate and 10 ml of tetrahydrofuran. The number average molecular weight of the polymer matrix measured by GPC was 46500, and the molecular weight distribution was 1.32. In this embodiment, the driving voltage is 16V, and the light transmittance in the open state is 68.3%.

Embodiment 3

[0032] According to the method in Example 1, macromolecular reagents were synthesized and PDLC membranes were fabricated. The preparation ratio and photocuring process of the photosensitive solution are the same as in Example 1, except that the formula for synthesizing macromolecular reagents is: 15 parts of 4-trifluoromethylstyrene (TFSt), 0.025 parts of azobisisobutyronitrile, S, S' - 0.21 part of bis(α,α'-dimethyl-α''-acetic acid)-trithiocarbonate and 10 ml of tetrahydrofuran, the prepared macromolecular reagent is RAFT-PTFSt. The number average molecular weight of the polymer matrix measured by GPC was 57400, and the molecular weight distribution was 1.33. In this embodiment, the driving voltage is 18V, and the light transmittance in the open state is 69.7%.

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Abstract

The invention discloses a polymer dispersed liquid crystal film and preparation method thereof. The liquid crystal film comprises, by mass: 65-135 parts of a substrate material, 65-135 parts of a liquid crystal material, and 0.2-2.0 parts of glass microspheres. The substrate material is composed of, by mass: 10-20 parts of a macromolecular agent, 0.65-1.35 parts of a photo-initiator, and 55-115 parts of one selected from n-propyl methacrylate, n-octyl methacrylate, trifluoroethyl methacrylate, dodecyl methacrylate, and tert-butyl methacrylate. The macromolecular agent is composed of, by mass: 0.02-0.09 parts of azobisisobutyronitrile, 0.19-0.26 parts of a trisulfide ester chain transfer agent, and 10-20 parts of one selected from 4-methoxy styrene, 4-trifluoromethyl styrene, and 4-methyl styrene. With the method provided by the invention, problems of uncontrollable substrate molecular weight and structure of prior arts are solved, driving voltage of the polymer dispersed liquid crystal film is reduced, and on-state light transmittance is improved. Therefore, an ultraviolet radiation device is not needed, such that the method is energy-saving, environment-friendly, and safe.

Description

[0001] Technical field (basically determined) [0002] The invention relates to the field of liquid crystal technology, and more specifically relates to a polymer dispersed liquid crystal film and a preparation method thereof. Background technique [0003] Polymer dispersed liquid crystal (polymer dispersed liquid crystal, hereinafter referred to as PDLC) film material is a new type of electro-optic material formed by small molecular liquid crystal droplets dispersed in a polymer matrix. The orientation of the liquid crystal molecules can be controlled by the electric field, and the light transmittance of the PDLC film can be adjusted to realize bright and dark display. Compared with traditional liquid crystal displays, the advantages of PDLC films are that their preparation process is simple, easy to large-scale, short response time, no need for polarizers, and high-brightness display can be achieved. It can be used in flexible display devices, filters, adjustable lenses, Op...

Claims

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Application Information

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IPC IPC(8): C08L51/00C08F257/00C08F220/18C08F220/22C08F2/38C08F2/46C08K7/20C08J5/18C09K19/38
Inventor 汪映寒邵磊山杨文杰张玉良
Owner SHENZHEN DALTON ELECTRONICS MATERIAL CO LTD
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