Electrochemical method for synthesizing polyaniline in eigen state under high pH electric activity

A technology of intrinsic state polyaniline and synthesis method, applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., to achieve the effects of high electrical conductivity, good electrical activity, and fast ion exchange rate

Inactive Publication Date: 2010-01-27
YANGZHOU UNIV
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  • Abstract
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Problems solved by technology

In order to solve this problem, people use methods such as doping, changing functional groups, and copolymerization with other substances to improve its activity. However, the synthesis of polyaniline with good electrical activity at high pH and high conductivity has not yet been solved.

Method used

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Experimental program
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Embodiment Construction

[0019] 1. Raw materials

[0020] Aniline distilled under reduced pressure and stored at 4°C

[0021] N-Methylimidazole

[0022] diethyl sulfate

[0023] sulfuric acid

[0024] toluene

[0025] 2. Synthesis of ionic liquid ethyl sulfate-1-methyl-3-ethylimidazole

[0026] 1. Fully dissolve 0.44mol N-methylimidazole in 150ml toluene on an ice-water bath.

[0027] 2. Slowly add 0.44 mol of diethyl sulfate to the solution composed of N-methylimidazole and toluene while stirring.

[0028] 3. Continue to stir for 3 to 6 hours after adding diethyl sulfate until the reaction between N-methylimidazole and diethyl sulfate is complete.

[0029] 4. Remove the toluene solution in the upper layer, and wash with toluene several times under stirring.

[0030] 5. Vacuum at 75°C to remove the residual organic solvent - toluene.

[0031] 6. Dry in a vacuum oven at 75°C until constant weight.

[0032] 3. Preparation of electrolyte

[0033] Add 0.1~0.6mol aniline to the prepared 1.0~1.5mo...

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Abstract

This invention discloses a method for electrically synthesizing intrinsic polyaniline with high electrical activity at high pH values. The method comprises: (1) electrolyzing aniline (0.1-0.6 mol / dm3) in mixed solution of ionic liquid and sulfuric acid in a constant-potential electrolytic tank with Pt electrodes; (2) washing the product with 0.02 mol / dm3 sulfuric acid, and vacuum-drying at 60-70 deg.C to obtain intrinsic polyaniline with high electrical activity at high pH values. Polyaniline thus obtained has the same good properties as that prepared in proton acid, and has excellent electrochemical activity in KCl solution at pH value of 12. The electrochemical activity is only reduced by 24.4% when the pH value changes from 7.0 to 12.0. Besides, polyaniline synthesized in mixed solution of ionic liquid and sulfuric acid has an electrical conductivity of 5.2 S / cm.

Description

technical field [0001] The invention relates to a method for preparing polyaniline with good electrical activity, high conductivity and fast ion exchange rate at high pH. Background technique [0002] In view of polyaniline's good conductivity, high charge storage capacity and good environmental stability, it has a wide range of applications in plastic batteries, chemical biosensors, light-emitting diodes, metal anticorrosion, antistatic, electromagnetic shielding, etc. application. However, its conductivity, energy density, catalytic activity, electrochromism, and energy conversion are all affected by pH. This is because polyaniline almost loses its electrochemical activity when pH>4. In order to solve this problem, people use methods such as doping, changing functional groups, and copolymerization with other substances to improve its activity. However, the synthesis of polyaniline in the intrinsic state with good electrical activity at high pH and high conductivity ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/00C08G73/02
Inventor 阚锦晴景国林
Owner YANGZHOU UNIV
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