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Method for preparing self-dispersion nano-level conducting polyaniline

A technology for conducting polyaniline and aniline monomer, which is applied in the field of preparation of conducting polyaniline, can solve the problems of emulsion storage and transportation restrictions, etc., and achieves the effects of environmental protection in preparation and use process, and simple and easy preparation method.

Inactive Publication Date: 2006-10-25
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, surfactants or water-soluble polymer stabilizers added during emulsion polymerization usually have adverse effects on the use of conductive polyaniline emulsions, and the storage and transportation of emulsions are also subject to certain restrictions.

Method used

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preparation example Construction

[0018] The said method of preparing conductive polyaniline of the present invention, it comprises the steps:

[0019] (1) Put the aniline monomer and the aqueous solution of an inorganic acid (preferably hydrochloric acid or sulfuric acid) with a concentration of 1M to 2M in a reactor, add an aqueous solution of ammonium persulfate (oxidant) to the reactor, Stir for 10-30 minutes, add cyclodextrin (β-cyclodextrin, α-cyclodextrin or γ-cyclodextrin), the molar ratio of aniline monomer to cyclodextrin is 1: (0.1-1.2), and then Stir at 10°C to 30°C for 24 to 36 hours.

[0020] (2) Filter out the undissolved cyclodextrin, then add the remaining ammonium persulfate aqueous solution (oxidant), continue oxidation polymerization for 5-8 hours at 10°C-30°C, filter, filter cake after washing and vacuum drying (The optimal conditions for vacuum drying are: the temperature is 50°C and the time is 24 hours) to obtain the target object;

[0021] In the present invention, the molar ratio of...

Embodiment 1

[0024] Take 1.0ml of distilled aniline and put it into a three-neck flask containing 20ml of 2M HCl solution, add 1.0ml of 0.8M ammonium persulfate aqueous solution, stir at 20°C for 20 minutes, add 3.0g of β-cyclodextrin (China Pharmaceutical Group Shanghai Chemical Reagent Company), stirred at 20°C for 24 hours. Filter the undissolved β-cyclodextrin, add the remaining 9.0ml 0.8M ammonium persulfate aqueous solution in batches, continue oxidative polymerization at 20°C with stirring for 5 hours, filter and wash, then vacuum dry at 50°C for 24 hours , to obtain light green solid powder. The diameter of the fibrous conductive polyaniline is less than 100nm, the conductivity is 8.7S / cm, and it can be dispersed in the water medium again without any dispersant. The dispersion system has no obvious sedimentation and stratification phenomenon after being placed at room temperature for about three weeks. .

Embodiment 2

[0026] Put 1.0ml of distilled aniline into a three-necked flask containing 20ml of 1.5M HCl solution, add 1.0ml of 0.8M ammonium persulfate aqueous solution, stir at 20°C for 20 minutes, add 10g of α-cyclodextrin (Aldrich Co.) , stirred at 20°C for 24 hours. Filter the undissolved α-cyclodextrin, add the remaining 9.0ml 0.8M ammonium persulfate aqueous solution in batches, continue oxidative polymerization at 20°C with stirring for 7 hours, filter and wash, then vacuum dry at 50°C for 24 hours , to obtain light green solid powder. The diameter of the fibrous conductive polyaniline is less than 100nm, the conductivity is 5.3S / cm, and it can be dispersed in the water medium again without any dispersant. The dispersion system has no obvious sedimentation and stratification after being placed at room temperature for about three weeks. .

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Abstract

The invention relates to a manufacture method for electric conductive polyaniline that is made from aniline monomer taking oxidative polymerization. The feature is that cyclodextrin is added during the oxidative polymerization process, and the mol ratio of aniline monomer and cyclodextrin is 1: (0.1-1.2). The method is easy to operate and has environment protection process.

Description

technical field [0001] The invention relates to a preparation method of conductive polyaniline. Background technique [0002] Conductive polymers are one of the most prominent representatives of many functional polymers developed in the middle of the 20th century. Due to their unique physical and chemical properties, conductive polymers can be widely used in the development of multifunctional materials and devices. [0003] Compared with other conductive polymers, polyaniline has the advantages of readily available raw materials, simple synthesis, and good environmental stability, so it has become one of the hotspots in the field of conductive polymer research. Conductive polyaniline is made from aniline monomer by chemical or electrochemical oxidation polymerization in acidic aqueous solution. However, the conductive polyaniline prepared by oxidation polymerization by existing chemical or electrochemical methods is difficult to dissolve and melt, and the processability is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C08B37/16
Inventor 李星玮赵云朴庄弢王更超
Owner EAST CHINA UNIV OF SCI & TECH
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