Polymer for electrooptical material, dispersed liquid crystal film and method for preparing polymer

A technology of dispersing liquid crystals and electro-optic materials, applied in the al field, can solve the problems of PDLC film hysteresis, high driving voltage, and low ratio, and achieve the effects of improving refractive index matching, increasing display contrast, and reducing interaction force

Inactive Publication Date: 2012-10-24
常州市弘可利办公用品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the serious hysteresis, high driving voltage, and low contrast of current PDLC films, the use of PDLC films in various fields is limited.
In recent years, many scientists have done a lot of work to improve the electro-optical properties of PDLC films, such as adding conductive polymers to the PDLC matrix, adjusting the composition of the matrix material, and changing the type of liquid crystal, etc. However, it is difficult to obtain a driving voltage of 25 volts. Below, PDLC with an on-state transmittance of more than 65%

Method used

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  • Polymer for electrooptical material, dispersed liquid crystal film and method for preparing polymer
  • Polymer for electrooptical material, dispersed liquid crystal film and method for preparing polymer
  • Polymer for electrooptical material, dispersed liquid crystal film and method for preparing polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A. Add 10 parts of 4-fluorostyrene, 0.0225 parts of dibenzoyl peroxide and 0.225 parts of benzyl-1-propionic acid-trithioester to 10ml of tetrahydrofuran, put it in a 100ml three-necked flask, and bubbling nitrogen for 15min to remove Oxygen in the system. After stirring and reacting in a 90℃~110℃ oil bath for 24h, the macroinitiator RAFT-FPS was obtained after ethanol precipitation, suction filtration and vacuum drying; the number average molecular weight of RAFT-FPS measured by GPC was 6300, and the molecular weight distribution Is 1.32.

[0048] B. Add 0.032 parts of dibenzoyl peroxide, 10 parts of RAFT-FPS prepared in step A and 40 parts of methyl methacrylate (MMA) into 50ml of tetrahydrofuran, and prepare the macroinitiator RAFT under the same conditions as a -FPS-PMMA; The number average molecular weight of RAFT-FPS-PMMA measured by GPC is 25500, and the molecular weight distribution is 1.34.

[0049] C. 50 parts by weight of macroinitiator RAFT-FPS-PMMA, 50 part...

Embodiment 2

[0054] According to the method in Example 1, the macroinitiator RAFT-FPS-PMMA was synthesized and a PDLC film was made. The preparation ratio of the photosensitive solution and the photocuring process are the same as in Example 1. The difference is that the formulation of the synthetic macroinitiator RAFT-FPS is: 4-fluorostyrene 10 parts, dibenzoyl peroxide 0.03 parts, and benzyl-1-propane 0.3 part of acid-trithioester and 10ml of tetrahydrofuran. Electro-optical performance as attached Figure 4 As shown, the driving voltage of the obtained PDLC is 21V, and the on-state light transmittance is 70.6%. The number average molecular weight of the polymer matrix of PDLC measured by GPC was 34,200, and the molecular weight distribution was 1.36.

Embodiment 3

[0056] According to the method in Example 1, the macroinitiator RAFT-FPS-PMMA was synthesized and a PDLC film was made. The preparation ratio of the photosensitive solution and the photocuring process are the same as in Example 1. The difference is that the formula of the synthetic macroinitiator RAFT-FPS-PMMA is: 0.025 parts of dibenzoyl peroxide, 15 parts of macroinitiator RAFT-FPS, 60 parts MMA and 30ml tetrahydrofuran. The driving voltage of the obtained PDLC is 22V, and the on-state light transmittance is 66.3%. The number average molecular weight of the PDLC polymer matrix measured by GPC was 45,700, and the molecular weight distribution was 1.35.

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Abstract

A polymer for an electrooptical material is composed of 0.025-0.085 part of benzoyl peroxide, 0.1-0.35 part of chain transfer agent, 5-15 parts of styrene derivatives and 20-60 parts of acrylic ester I by weight. The polymer is prepared from a living radical polymerization method, and can be used as a macroinitiator to be applied in the basis material of a polymer dispersed liquid crystal film material so as to prepare a polymer dispersed liquid crystal (PDLC) film. The prepared PDLC film has the driving voltage of no more than 25V and the On-state transmittance of above 65% at the same time, so the comprehensive electro-optic performance of the PDLC film can be obviously improved.

Description

Technical field [0001] The invention relates to a block polymer, in particular to a polymer prepared from dibenzoyl peroxide, styrene derivatives and acrylates, etc., and used as an initiator for polymer dispersed liquid crystal (Polymer Dispersed Liquid Crystal) Liquid Crystal, PDLC) film base material, PDLC film and its preparation method. Background technique [0002] Polymer dispersed liquid crystal film material is a new type of electro-optical composite material formed by small molecular liquid crystal droplets dispersed in a polymer matrix. By adjusting the applied electric field, the orientation of the liquid crystal molecules can be controlled, so that the PDLC film presents two different optical states of transmission and scattering, and realizes bright and dark display. Because the liquid crystal of PDLC film prepared by the polymerization-induced phase separation (PIPS) method has the characteristics of uniform particle size distribution, good reproducibility, simple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F212/14C08F212/12C08F293/00C08L53/00C08K7/20G02F1/1334C09K19/52
Inventor 汪映寒包柏青谢浩李祝雁
Owner 常州市弘可利办公用品有限公司
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