Preparation method of polyaniline nanofibers

A nanofiber and polyaniline technology, applied in the field of polymer synthesis, can solve problems such as low purity, environmental pollution, and uneven diameter of polyaniline nanofibers, and achieve the effect of reducing the use of solvents and reducing costs

Inactive Publication Date: 2011-09-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, the current methods for preparing polyaniline nanofibers generally have the following problems: (1) the template method has the problem that the template agent is not easy to remove, and the post-processing is cumbersome, and the post-processing process is easy to cause damage to the polyaniline nanofibers; (2) ) The interfacial polymerization method has the problem that the amount of organic solvent used is large and causes environmental pollution; (3) the electrochemical method, the ultrasonic radiation method and the seed polymerization method have high requirements for experimental conditions and are not suitable for large-scale production; (4) Due to the very low concentration of polyaniline in the dilute solution method, the yield of this method is low, and it is not suitable for industrial mass production
However, this method has the following two problems: (1) the diameter of polyaniline nanofibers is not uniform, the purity is not high, and the size is difficult to control; (2) the concentration of aniline monomer is low, which is still the same as the traditional concentration of 1mol / L There is a certain gap and cannot be industrialized

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  • Preparation method of polyaniline nanofibers
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  • Preparation method of polyaniline nanofibers

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preparation example Construction

[0039] The invention provides a method for preparing polyaniline nanofibers, comprising: a) mixing aniline monomers with inorganic acids to obtain a first mixed solution; the concentration of aniline monomers in the first mixed solution is 1-3 mol / L b) mixing the oxidizing agent with the first mixed solution to obtain a second mixed solution, and the aniline monomer in the second mixed solution is polymerized to obtain the first reaction product; the oxidation-reduction potential E of the oxidizing agent is ox 0.5V≤E ox ≤0.8V; c) washing, alkali washing and drying the first reaction product to obtain polyaniline nanofibers.

[0040]According to the present invention, the "false high dilute" technology is a technology that creates high dilute reaction conditions by controlling the concentration of the reaction solution. Make the reactants into a concentrated solution, then slowly add the reactant solution dropwise into the reaction system, and keep the unreacted end groups of ...

Embodiment 1

[0049] Step 1. Dissolving the aniline monomer in 0.5mol / L nitric acid under stirring conditions to make an aniline monomer salt solution A with a molar concentration of 1mol / L;

[0050] Step 2, under stirring conditions, ferric nitrate is dissolved in deionized water to form 1mol / L ferric nitrate aqueous solution B;

[0051] Step 3, the molar ratio is aniline monomer: ferric nitrate=1:3, at 0°C, add A and B dropwise into the reactor at a rate of 35mL / min, after the dropwise addition is completed, stop stirring and keep the temperature 0°C, keep it still for 24 hours;

[0052] Step 4, after filtering the reaction product obtained in step 3, wash with water, methanol and deionized water respectively until the filtrate is colorless;

[0053] Step 5, soak the product obtained in step 4 with 0.5mol / L ammonia water for 24h, then wash with deionized water until the filtrate is colorless;

[0054] Step 6. Vacuum drying the product obtained in Step 5 to obtain polyaniline nanofibers,...

Embodiment 2

[0057] Step 1, under stirring conditions, the aniline monomer is dissolved in 1.5mol / L phosphoric acid to make the aniline monomer salt solution A whose molar concentration is 3mol / L;

[0058] Step 2, under stirring conditions, ferric nitrate is dissolved in deionized water to form 3mol / L ferric nitrate aqueous solution B;

[0059] Step 3, the molar ratio is aniline monomer: ferric nitrate=1:15, at -30°C, drop A and B into the reactor at a speed of 45mL / min, after the dropwise addition is completed, stop stirring and keep The temperature is -30°C, and it is placed statically for 64 hours;

[0060] Step 4, after filtering the reaction product obtained in step 3, wash with water, methanol and deionized water respectively until the filtrate is colorless;

[0061] Step 5, soak the product obtained in step 4 with 1mol / L ammonia water for 10h, then wash with deionized water until the filtrate is colorless;

[0062] Step 6. Vacuum drying the product obtained in Step 5 to obtain pol...

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Abstract

The invention provides a preparation method of polyaniline nanofibers, which comprises the following steps of: (a) mixing a phenylamine monomer and an inorganic acid to obtain a first mixed liquid, wherein the concentration of the phenylamine monomer in the first mixed liquid is 1 -3 mol/L; (b) mixing an oxidizing agent and the first mixed liquid to obtain a second mixed liquid, and polymerizing the phenylamine monomer in the second mixed liquor to obtain a first reaction product, wherein the oxidation-reduction potential Eox of the oxidizing agent is less than or equal to 0.8V and larger than or equal to 0.5V; and (c) cleaning, washing with alkali and drying the first reaction product to obtain the polyaniline nanofibers. Compared with the prior art, the preparation method provided by the invention has the advantages that the prepared polyaniline nanofibers have uniform diameter and high purity and are suitable for large-scale industrial production, and the production efficiency is increased.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a preparation method of polyaniline nanofibers. Background technique [0002] Polyaniline is a high-molecular material with excellent electrical conductivity. Its monomer is easy to obtain, it has diverse structures, unique doping mechanism, good environmental stability, and broad technical application prospects, which has attracted the attention of scientists. However, the disadvantages of polyaniline, such as poor solubility, high melting point, and poor processability, limit the industrial production of polyaniline. Therefore, the synthesis of nano-polyaniline with high conductivity, good solubility and small particle size has become a hot research topic today. [0003] At present, there are mainly two methods for synthesizing nano-polyaniline. One is electrochemical method. Chinese patent CN 1958854A discloses a preparation method of nano-polyaniline fiber. This patent uses a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02
Inventor 刘建张红明李季王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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