Preparation method of polyaniline

A technology of polyaniline and aniline, which is applied in the field of polyaniline preparation, can solve the problems of poor solubility of polyaniline, achieve high solubility, low molecular weight, and ensure regularity

Active Publication Date: 2014-01-29
中科应化(长春)科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polyaniline prepared by the above patents still has poor solubility in common solvents

Method used

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  • Preparation method of polyaniline

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preparation example Construction

[0028] The embodiment of the present invention discloses a preparation method of polyaniline, comprising the following steps:

[0029] mixing aniline with an organic solvent to obtain a first mixed solution;

[0030] Mixing an oxidizing agent with an aqueous mineral acid solution to obtain a second mixed solution, the oxidizing agent being potassium ferricyanide;

[0031] The first mixed solution is mixed with the second mixed solution to obtain polyaniline after reaction.

[0032] According to the present invention, in the process of preparing polyaniline, the aniline monomer is first mixed with an organic solvent, that is, the aniline monomer is dissolved in the organic solvent to obtain a first mixed solution. The concentration of the aniline monomer in the first mixed solution is preferably 1-6 mol / L, more preferably 1.2-3.5 mol / L, and most preferably 1.5-3 mol / L. The concentration of the aniline monomer in the first mixed solution has a certain influence on the molecula...

Embodiment 1

[0045] Step 1: Dissolving 1 mol of aniline monomer in toluene to obtain a first mixed solution, the concentration of aniline monomer in the first mixed solution is 1 mol / L;

[0046] Step 2: Dissolving 1.2mol potassium ferricyanide in 1mol / L hydrochloric acid to obtain a second mixed solution;

[0047] Step 3: Mix the first mixed solution and the second mixed solution, and place it statically at -5°C for 12 hours;

[0048] Step 4: soak the reaction product obtained in step 3 with 150ml of 0.5mol / L ammonia water for 24h, then wash with water, methanol and deionized water until the filtrate is colorless;

[0049] Step 5: The product obtained in Step 4 was vacuum-dried for 24 hours at a vacuum degree of 0.6 MPa and a drying temperature of 40° C. to obtain polyaniline.

[0050] The polyaniline prepared in this example was tested, and the results showed that the polyaniline obtained in this example had a particle size of 0.8-1.2 μm, a number average molecular weight Mn of 3509 Dalt...

Embodiment 2

[0052] Step 1: Dissolving 1mol of aniline monomer in carbon tetrachloride to obtain a first mixed solution, the concentration of aniline monomer in the first mixed solution is 6mol / L;

[0053] Step 2: 20mol potassium ferricyanide is dissolved in the hydrochloric acid of 1mol / L, obtains the second mixed solution;

[0054] Step 3: Mix the first mixed solution and the second mixed solution, and place it statically at 25°C for 36 hours;

[0055] Step 4: soak the reaction product obtained in step 3 with 280ml of 1mol / L ammonia water for 2h, then wash with water, methanol and deionized water until the filtrate is colorless;

[0056] Step 5: The product obtained in Step 4 was vacuum-dried for 36 hours at a vacuum degree of 0.9 MPa and a drying temperature of 50° C. to obtain polyaniline.

[0057] The polyaniline prepared in this example was tested, and the results showed that the polyaniline obtained in this example had a particle size of 0.52-0.87 μm, a number average molecular wei...

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Abstract

The invention provides a preparation method of polyaniline. The preparation method comprises the following steps: mixing aniline with an organic solvent to obtain a first mixed solution; mixing an inorganic acid aqueous solution with an oxidizing agent, namely potassium ferricyanide, to obtain a second mixed solution; and mixing the first mixed solution with the second mixed solution for reaction to obtain polyaniline. Due to the adoption of the potassium ferricyanide oxidizing agent with low oxidation reduction potential as well as interfacial polymerization, the prepared polyaniline is regular in structure and low in molecular weight, thereby having high solubility. Experiment results show that the polyaniline prepared by the preparation method can be completely solved in polar solvents N-methyl pyrrolidinone, dimethylacetamide and dimethyl sulfoxide, as well as in common solvents tetrahydrofuran and ethanol.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of polyaniline. Background technique [0002] As an important conductive polymer material, polyaniline has been widely concerned and studied. However, the special rigid structure of polyaniline makes it difficult to dissolve in common solvents such as ethanol and tetrahydrofuran, and it is difficult to achieve 100% dissolution even in strong polar solvents such as N-methylpyrrolidone and dimethylformamide. The solubility of polyaniline is related to its preparation method, for example: in acidic medium, ammonium persulfate is the polyaniline prepared by oxidant (MacDiarmid et al., Mol.Cryst.Liq.Cryst., 1985,121,173) has Very high molecular weight (number-average molecular weight Mn=1.8-27,000, weight-average molecular weight Mw=10.6-182,000), such a high molecular weight makes polyaniline with excellent rigid structure difficult to dissolve in comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02
Inventor 张红明刘年江李季王献红王佛松
Owner 中科应化(长春)科技有限公司
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