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A kind of preparation method of water-soluble polyaniline

A polyaniline and water-soluble technology, applied in the field of preparation of water-soluble polyaniline, can solve the problem of low degree of copolymer grafting, large steric hindrance of methoxy polyethylene glycol o-aminophenyl ether, and difficult grafting rate. control and other issues, to achieve the effects of easy process control, high atom utilization, and easy separation and purification

Active Publication Date: 2018-02-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported in the literature that PAn-g-PEG graft copolymers are prepared by copolymerization of aniline and methoxypolyethylene glycol o-aminophenyl ether, but the method uses methoxypolyethylene glycol o-aminophenyl ether The resistance is large, and there are problems such as low degree of grafting of the copolymer and difficulty in controlling the grafting rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 14.88 g of aniline, 5.0 g of o-aminothiophenol, and 6.53 g of dodecylbenzenesulfonic acid were dissolved in 200 mL of water, stirred evenly, and kept at 0°C for 30 min to prepare an aniline aqueous solution. Dissolve 22.8 g of ammonium persulfate in 140 mL of 0.5 mol / L hydrochloric acid, stir well and then keep the temperature at 0°C for 30 min. The above two solutions were mixed and reacted at 0°C for 3 h to obtain low molecular weight water-soluble polyaniline.

[0028] Adjust the pH of the above reaction solution to 8~9 with ammonia water, add 4.0 g of triethylamine and 15.0 g of polyethylene glycol methacrylate (molecular weight: 300), heat the reaction solution to 70°C, and react for 3 h. After the reaction, cool down to 0°C, add 8 mL of concentrated hydrochloric acid and 22.8 g of ammonium persulfate, and react at 0°C for 12 h. After the reaction, pour the reaction solution into 1000 mL of acetone for precipitation, filter and wash with acetone. After vacuum dryi...

Embodiment 2

[0030] 14.88 g of aniline and 7.5 g of o-aminothiophenol were dissolved in 200 mL of water, stirred evenly, and kept at 0 °C for 30 min to prepare an aqueous solution of aniline. Dissolve 25.8 g of ammonium persulfate in 100 mL of 1.0 mol / L hydrochloric acid, stir well and then keep the temperature at 0°C for 30 min. The above two solutions were mixed and reacted at 0°C for 3 h to obtain low molecular weight water-soluble polyaniline.

[0031] Adjust the pH of the above reaction solution to 8~9 with ammonia water, add 6.0 g of triethylamine and 20.0 g of polyethylene glycol methacrylate (molecular weight: 300), heat the reaction solution to 70°C, and react for 3 h. After the reaction, cool down to 0°C, add 8 mL of concentrated hydrochloric acid and 25.8 g of ammonium persulfate, and react at 0°C for 12 h. After the reaction, pour the reaction solution into 1000 mL of acetone for precipitation, filter and wash with acetone. After vacuum drying at 50°C for 24 h, water-soluble p...

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Abstract

The invention introduces a preparation method of water-soluble polyaniline: under the condition of -10°C~20°C, add acid and oxidant to aniline (or substituted aniline), o-aminothiophenol aqueous solution, and react for 1 h~ After 4 h, low-molecular-weight polyaniline was obtained; the pH of the reaction solution was adjusted to alkaline by alkali, triethylamine and polyethylene glycol methacrylate (PEGMEMA) were added, and the reaction was carried out at 40°C to 80°C for 1 h~6 h to obtain PEG-grafted polyaniline; then add acid and oxidant to the reaction solution, continue the reaction for 1 h~20 h, further polymerize low molecular weight polyaniline, precipitate through acetone, filter and dry to obtain high molecular weight water-soluble Sexual polyaniline. The invention has mild reaction conditions, simple synthesis route, easy process control, easy separation and purification, high atom utilization rate, less three wastes, and is beneficial to industrial development.

Description

technical field [0001] The invention relates to a preparation method of water-soluble polyaniline, belonging to the technical field of conductive polymers. Background technique [0002] Polyaniline (PAn) has a wide range of applications in optoelectronics, light-emitting diodes, secondary batteries, sensors, electromagnetic shielding, and metal anti-corrosion due to the advantages of cheap raw materials, easy synthesis, good environmental stability, and special doping mechanism. The application prospect has been paid more and more attention by people. However, due to the strong rigidity of the polyaniline chain and the strong interaction between the chains, it is insoluble and infusible, and the processing is difficult, which limits its technical application and development. Therefore, improving the solubility of polyaniline has become a topic of great concern to researchers at home and abroad. [0003] At present, there are many synthetic methods for preparing water-solub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C08G73/02
Inventor 金玉存陈永平金汉强吴其建司马维维周亚芩
Owner CHINA PETROLEUM & CHEM CORP