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

A technology of dispersing liquid crystals and polymers, 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: 2014-08-13
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 into 10ml of tetrahydrofuran, place in a 100ml three-necked flask, and pass nitrogen gas for 15min to remove oxygen in the system. Stir and react in an oil bath at 90°C to 110°C for 24 hours, precipitate with ethanol, filter with suction, and dry in vacuum to obtain the macromolecular initiator RAFT-FPS; the number average molecular weight of RAFT-FPS measured by GPC is 6300, and the molecular weight distribution is 1.32.

[0048] B. Take 0.032 parts of dibenzoyl peroxide, 10 parts of RAFT-FPS prepared in step A and 40 parts of methyl methacrylate (MMA) and add them to 50ml of tetrahydrofuran, and prepare the macroinitiator RAFT according to 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 macro...

Embodiment 2

[0054] The macromolecular initiator RAFT-FPS-PMMA was synthesized according to the method in Example 1 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 macroinitiator RAFT-FPS is: 10 parts of 4-fluorostyrene, 0.03 part of dibenzoyl peroxide, benzyl-1-propane 0.3 part of acid-trithioester and 10 ml of tetrahydrofuran. Electro-optical performance as attached Figure 4 As shown, the driving voltage of the obtained PDLC is 21V, and the light transmittance in the open state is 70.6%. The number average molecular weight of the polymer matrix of PDLC measured by GPC is 34200, and the molecular weight distribution is 1.36.

Embodiment 3

[0056] The macromolecular initiator RAFT-FPS-PMMA was synthesized according to the method in Example 1 and a PDLC film was fabricated. The preparation ratio of the photosensitive solution and the photocuring process are the same as in Example 1, except that the formula for synthesizing the macroinitiator RAFT-FPS-PMMA is: 0.025 parts of dibenzoyl peroxide, 15 parts of the macroinitiator RAFT-FPS, 60 parts MMA and 30ml tetrahydrofuran. The driving voltage of the obtained PDLC is 22V, and the light transmittance in the open state is 66.3%. The number average molecular weight of the polymer matrix of PDLC measured by GPC is 45700, and the molecular weight distribution is 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 present invention relates to a kind of block polymer, relate in particular to a kind of polymer prepared by dibenzoyl peroxide, styrene derivative and acrylate etc., and use this as initiator for polymer dispersed liquid crystal (PolymerDispersed Liquid Crystal, PDLC) thin film matrix material, PDLC thin film and its preparation method. Background technique [0002] Polymer-dispersed liquid crystal film material is a new type of electro-optic composite material formed by dispersing small molecular liquid crystal droplets in a polymer matrix. By adjusting the applied electric field, the orientation of liquid crystal molecules can be controlled, so that the PDLC film exhibits two different optical states of transmission and scattering, and realizes bright and dark display. Since the liquid crystals of PDLC films prepared by the polymerization-induced phase separation (PIPS) method have the characteristics of uniform particle size distribution, good ...

Claims

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Application Information

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Patent Type & Authority Patents(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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