Method for preparing hollow polyaniline microspheres

A polyaniline, hollow technology, applied in the field of materials, can solve the problems of complicated operation and high cost, and achieve the effect of simple preparation method, low cost and avoiding transformation

Inactive Publication Date: 2011-08-17
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0005] However, in the above-mentioned reports about the preparation of polyaniline hollow microspheres, as the aniline polymerization proceeds, the pH value of the reaction system decreases. In order to prevent the transformation of the micelles from spherical to other linear shapes, it is necessary to add dopants and other substances, therefore, the operation is complicated and the cost is higher

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  • Method for preparing hollow polyaniline microspheres
  • Method for preparing hollow polyaniline microspheres
  • Method for preparing hollow polyaniline microspheres

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preparation example Construction

[0029] The embodiment of the present invention discloses a preparation method of polyaniline hollow microspheres, comprising:

[0030] Step a) mixing aniline with a molar ratio of 1:1.5 to 15 in a solvent and reacting it with an oxidizing agent, wherein the oxidizing agent is potassium ferricyanide, sodium ferricyanide, iron phosphate or copper sulfate;

[0031] Step b) drying the reaction product obtained in step a) to obtain polyaniline hollow microspheres.

[0032] According to the present invention, the molar ratio of the aniline to the oxidizing agent is preferably 1:2-10, more preferably 1:3-5. The reaction temperature in step a) is preferably -10-10°C, more preferably -5-10°C, most preferably -5-5°C. The reaction time is preferably 15 to 80 hours, more preferably 20 to 60 hours, most preferably 30 to 50 hours.

[0033] In the step a), the aniline with a molar ratio of 1:1.5 to 15 is mixed with an oxidant in a solvent, specifically:

[0034] Add aniline to water, stir...

Embodiment 1

[0046] Step 1. Add the aniline monomer into deionized water, and stir it electromagnetically for 3 hours to obtain a 0.2mol / L aniline aqueous dispersion;

[0047]Step 2, adding potassium ferricyanide into deionized water, stirring electromagnetically for 0.5 h to obtain a 0.6 mol / L potassium ferricyanide aqueous solution;

[0048] Step 3. At -5°C, the molar ratio of aniline to potassium ferricyanide is 1:3, mix the aniline aqueous dispersion with the potassium ferricyanide aqueous solution evenly, keep the temperature at -5°C, and place it still 28h, reaction;

[0049] Step 4, filtering the reaction product obtained in step 3, washing with water, methanol and deionized water successively until the filtrate is colorless;

[0050] Step 5, vacuum-drying the product obtained in Step 4 for 26 hours to obtain polyaniline hollow microspheres.

[0051] The polyaniline hollow microspheres prepared in this embodiment have a diameter of 180-480 nm and a wall thickness of 70-75 nm. fig...

Embodiment 2

[0053] Step 1, adding aniline monomer into deionized water, ultrasonic treatment for 0.5h, to obtain 0.6mol / L aniline aqueous dispersion;

[0054] Step 2, adding potassium ferricyanide into deionized water, stirring electromagnetically for 2 hours to obtain a 3.0 mol / L potassium ferricyanide aqueous solution;

[0055] Step 3. At 10°C, mix the aniline aqueous dispersion with the potassium ferricyanide aqueous solution evenly according to the molar ratio of aniline and potassium ferricyanide as 1:5, keep the temperature at 10°C, and place it statically for 18 hours. reaction;

[0056] Step 4, filtering the reaction product obtained in step 3, washing with water, methanol and deionized water successively until the filtrate is colorless;

[0057] Step 5, vacuum drying the product obtained in step 4 for 36 hours to obtain polyaniline hollow microspheres.

[0058] The polyaniline hollow microspheres prepared in this example have a diameter of 200-520 nm and a wall thickness of 75-...

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Abstract

The embodiment of the invention discloses a method for preparing hollow polyaniline microspheres, comprising the following steps: mixing aniline and an oxidant at the molar ratio of 1:(1.5-15) in a solvent for reaction, wherein the aniline can be potassium ferricyanide, sodium ferricyanide, iron phosphate or copper sulfate; and drying the products of reaction to obtain the hollow polyaniline microspheres. In the process of preparing the hollow polyaniline microspheres, spherical micelles are formed by the aniline in the solvent, and the cores of the spherical micelles are filled with aniline droplets. Because the oxidant adopted by the method has low oxidation-reduction potential, the oxidant can not generate acidic materials in the aniline polymerization process, the spherical micelle structure can be prevented from being changed to be in linear or sheet shape, and the hollow polyaniline microspheres can be finally obtained. The method does not require a dopant, is simple, ensures lower cost and can be used for preparing the hollow polyaniline microspheres.

Description

technical field [0001] The invention relates to the technical field of materials, and more specifically, relates to a preparation method of polyaniline hollow microspheres. Background technique [0002] Polyaniline hollow microspheres have a hollow structure inside and a large specific surface area, and can be used in capacitors, drug release, stationary phases for separation science, biomedical equipment, conductive coating additives, etc., and have attracted widespread attention in recent years. [0003] At present, a variety of preparation methods of polyaniline hollow microspheres have been reported. For example, Yang et al. used sulfonated polystyrene as a template to form a polyaniline core-shell structure by in situ polymerization, and finally removed the sulfonated polystyrene template with tetrahydrofuran solvent to obtain polyaniline hollow microspheres (Reactive and Functional Polymers 2009, 69 , 137-144). Wang et al. used polystyrene as a template, ferric chlor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02B01J13/14
Inventor 刘建张红明张春李季王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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