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Soluble electrochromic polymer from neutral-state purple to oxidation-state high transmittance

A high transmittance, electrochromic technology, applied in the direction of nonlinear optics, optics, instruments, etc., can solve the problems of poor processability, less color types, etc., and achieve the effects of increased response rate, improved contrast, and high ion conductivity

Active Publication Date: 2021-09-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a soluble electrochromic polymer with high transmittance from neutral state purple to oxidized state and its preparation method, aiming to solve the shortcomings of existing electrochromic materials with few colors and poor processability, It is beneficial for electrochromic materials to achieve multiple color adjustments in future applications

Method used

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  • Soluble electrochromic polymer from neutral-state purple to oxidation-state high transmittance
  • Soluble electrochromic polymer from neutral-state purple to oxidation-state high transmittance
  • Soluble electrochromic polymer from neutral-state purple to oxidation-state high transmittance

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Embodiment 1

[0041] A molecular structure is The soluble electrochromic polymer with high transmittance from neutral purple to oxidized state, its reaction synthesis formula is as follows:

[0042]

[0043] Its preparation steps are as follows:

[0044] (1) Add 1.44g (10mmol) of 3,4-dimethoxythiophene, 5.24g (20mmol) of dibromoneopentyl glycol, 0.18g (1mmol) of p-toluenesulfonic acid, and 30mL of toluene into a 100mL two-necked flask in sequence , heated at 110 ° C for 16 hours, after the reaction, extracted three times with water and dichloromethane, collected the extract of the dichloromethane phase, concentrated and dehydrated with anhydrous sodium sulfate, purified by column chromatography, fixed on silica gel Phase, dichloromethane and petroleum ether are the mobile phase, and the volume ratio of dichloromethane and petroleum ether is 1:3. The eluate containing the target compound is collected by TLC thin layer chromatography, and the solvent is removed by rotary evaporation and ...

Embodiment 2

[0053] Embodiment 2: performance test (effect experiment and data) of the electrochromic material based on electrochromic polymer I

[0054] The electrochromic polymer I based on 3,4-ethylenedioxythiophene derivatives prepared in Example 1 was dissolved in chloroform solvent, spin-coated on an ITO glass substrate, and dried to obtain a polymer film; Ammonium hexafluorophosphate is used as the electrolyte, acetonitrile is used as the solvent, and a three-electrode system is used. The polymer film spin-coated on ITO is used as the working electrode, the platinum wire is used as the counter electrode, and the silver wire is used as the reference electrode; Electrochemical spectra (such as figure 2 shown). The color-changing performance of the polymer film shows that the polymer film of this example can change from purple in neutral state to colorless in oxidized state. Such as image 3 As shown, the coloring time of the electrochromic performance of the polymer film at 549nm ...

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Abstract

The invention discloses a soluble electrochromic polymer from neutral-state purple to an oxidation-state high transmittance and a preparation method thereof. Different lengths of alkane side chains are adjusted, then modified 3,4-ethylenedioxythiophene derivative monomers and dibromo monomers of the 3,4-ethylenedioxythiophene derivative monomers are copolymerized through direct arylation coupling polycondensation, and by adjusting the pi conjugation degree and the energy band structure of the polymer, the discoloration color of the polymer is regulated and controlled, and the conversion from purple to transparent is realized. The solubility of the polymer is realized by introducing a side chain. The polymer provided by the invention has electrochromic application potential and solution processing characteristics, the material has high ionic conductivity, and after voltage is applied, a large number of electrolyte ions are quickly diffused into the polymer material to balance charges and accelerate the discoloration speed of the material, so that the response rate and the contrast ratio of the material are improved.

Description

(1) Technical field [0001] The invention relates to the field of polymer materials, in particular to a soluble electrochromic polymer with high transmittance from a neutral purple state to an oxidized state and a preparation method thereof. (2) Background technology [0002] In 1961, Platt first proposed the definition of electrochromism. Electrochromism refers to the redox reaction of materials under the action of applied voltage due to the injection and extraction of charges, accompanied by the doping and dedoping of electrolyte ions. The optical absorption changes in the visible-near-infrared region, which is manifested as a reversible change in color and transmittance macroscopically. [0003] The early electrochromic materials were mainly inorganic electrochromic materials, but organic electrochromic materials came from behind because of their rich structure types, excellent electrochromic comprehensive performance and good processing performance. Many fields such as p...

Claims

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Application Information

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IPC IPC(8): C08G61/12G02F1/1516
CPCC08G61/126G02F1/15165
Inventor 欧阳密戴大程张诚
Owner ZHEJIANG UNIV OF TECH