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Bistable electrofluorochromatic polymer material, preparation method and applications thereof

A polymer material, bistable technology, applied in the field of bistable electroluminescent color-changing polymer materials and its preparation, can solve the problems of difficult design and synthesis, complicated preparation process, difficult product purification, etc., and achieve good reversibility , high luminous brightness, simple and efficient preparation method

Active Publication Date: 2020-05-01
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bistable electroluminescent color-changing materials can still display for a long time in the case of power failure, low energy consumption, and long life. Its design and synthesis are still a difficult point.
[0003] In addition, the existing conjugated polymer-based electroluminescent color-changing materials are all prepared by chemical polymerization. Since the luminous brightness of the product is greatly affected by catalyst impurities, the material needs to be obtained through multiple purifications, and then dissolved, spin-coated, etc. , annealing and other processes to obtain the electroluminescent color-changing film coated on the surface of the conductive substrate, the preparation process is complicated, the product purification is difficult, and the luminous brightness is low, which is another difficulty in the preparation of electroluminescent color-changing materials

Method used

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  • Bistable electrofluorochromatic polymer material, preparation method and applications thereof
  • Bistable electrofluorochromatic polymer material, preparation method and applications thereof
  • Bistable electrofluorochromatic polymer material, preparation method and applications thereof

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preparation example Construction

[0044] The preparation method of this polymer material comprises the following steps:

[0045] Step 1. Synthesis of carbazole derivative precursor: Dissolve p-hydroxybenzonitrile in dry N,N-dimethylformamide, then add potassium carbonate and potassium iodide in turn, stir for a period of time, slowly dropwise dissolve in dry The 9-(6-bromohexyl) carbazole solution of N,N-dimethylformamide was heated and stirred at 80-120°C, and the reaction progress was monitored by silica gel chromatography (TLC). After the reaction was completed, it was cooled and used The reaction was quenched with distilled water, and extracted with dichloromethane to obtain an organic phase. After the organic phase was concentrated, it was recrystallized with ethanol to obtain a white solid product, namely the precursor of the carbazole derivative.

[0046] Its synthetic route is as follows:

[0047]

[0048]Step 2, the synthesis of polymer monomer II: the carbazole derivative precursor is dissolved i...

Embodiment 1

[0055] Step 1, the synthesis of carbazole derivative precursor

[0056] Take a flask and dissolve 1.33g of p-hydroxybenzonitrile in 20mL of dry N,N-dimethylformamide, then add 2.50g of K 2 CO 3 and 0.25g KI, stirred in an oil bath at 80°C for 30min; 3.60g of 9-(6-bromohexyl)carbazole was dissolved in 5mL of dry N,N-dimethylformamide, and the solution was placed in The constant pressure titration funnel was slowly added dropwise to the above flask, stirred at 80°C for 12 hours, cooled and quenched with distilled water, extracted with dichloromethane to obtain the organic phase, washed three times with saturated brine, dried over anhydrous magnesium sulfate, and concentrated the organic phase. After recrystallization from ethanol, a white solid product, namely the precursor of the carbazole derivative, was obtained. The mass of the carbazole derivative precursor obtained at this time was 2.51 g, and the yield was 65%.

[0057] 1 H NMR (500MHz, CDCl 3 ,25℃): δ(ppm)8.146(d,J=...

Embodiment 2

[0064] Step 1, the synthesis of carbazole derivative precursor

[0065] Take a flask and dissolve 1.33g of p-hydroxybenzonitrile in 20mL of dry N,N-dimethylformamide, then add 2.50g of K 2 CO 3 and 0.25g KI, stirred in an oil bath at 90°C for 30min; 3.60g of 9-(6-bromohexyl)carbazole was dissolved in 5mL of dry N,N-dimethylformamide, and the solution was placed in The constant pressure titration funnel was slowly added dropwise to the above flask, stirred at 90°C for 10 h, cooled and quenched with distilled water, extracted with dichloromethane to obtain the organic phase, washed three times with saturated brine, dried over anhydrous magnesium sulfate, and concentrated the organic phase. After recrystallization from ethanol, a white solid product, namely the precursor of the carbazole derivative, was obtained. The mass of the carbazole derivative precursor obtained at this time was 2.71 g, and the yield was 70.8%.

[0066] Step 2, the synthesis of polymer monomer II

[006...

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Abstract

The invention discloses a bistable electrofluorochromatic polymer material, a preparation method and applications thereof, wherein the bistable electrofluorochromatic polymer material has a structurerepresented by a formula I, and is obtained by polymerizing a monomer with a structure represented by a formula II. The preparation method comprises the step of directly carrying out in-situ polymerization on the surface of a conductive substrate by adopting an electrochemical method to form a film, ie., the electrofluorochromatic polymer material. The preparation method is simple and efficient, and the obtained polymer film has excellent electrofluorochromatic performance, good fluorescence reversibility, high contrast ratio, short response time and stable performance, can be used in the fields of optical display, intelligent discoloration windows, camouflage materials and the like, also has bistable electrofluorochromatic performance, can still keep display for a long time after power failure, is an efficient and energy-saving material, and can be used for long-acting display devices such as electronic tags, advertisement screens and the like.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials, and in particular relates to a bistable electroluminescent color-changing polymer material and its preparation method and application. Background technique [0002] Electroluminescent discoloration refers to the phenomenon that the luminous intensity or color of a material undergoes a reversible change under the action of an applied voltage, specifically manifested as the on / off of fluorescence or the switching process of color. Electroluminescent chromic materials have attracted extensive attention due to their promising applications in flexible displays, smart windows, and data storage. At present, many research groups have developed electroluminescent color-changing materials with on / off reversible response. Most of the materials change color under the condition of applied voltage. When the applied voltage is removed, the color spontaneously returns to the original neutral stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/12C09K9/02
CPCC08G61/124C09K9/02C09K2211/1466C09K2211/1425C08G2261/11C08G2261/5222C08G2261/3241C08G2261/59C08G2261/44
Inventor 孙璟玮杨圣晨张玉建吴佳丽
Owner HUZHOU TEACHERS COLLEGE
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