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Flower-shaped porous polyaniline nanometer material and preparation method thereof

A nanomaterial and polyaniline technology, applied in the field of wave absorbing materials, can solve the problems of complicated steps of porous loose polyaniline composite material, unfavorable for industrial application and cost control, uneven molecular weight distribution of in-situ polymerization, etc. Multi-reflection effect, increasing electromagnetic wave receiving area, light specific gravity effect

Active Publication Date: 2017-05-17
HEFEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous and loose polyaniline composite material prepared by this method is complicated and difficult to control, and the molecular weight distribution of the in-situ polymerization is uneven, which is not conducive to industrial application and cost control, and it is difficult to obtain stable product performance, thus affecting the wide application of the material

Method used

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  • Flower-shaped porous polyaniline nanometer material and preparation method thereof
  • Flower-shaped porous polyaniline nanometer material and preparation method thereof
  • Flower-shaped porous polyaniline nanometer material and preparation method thereof

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preparation example Construction

[0025] A method for preparing a flower-like porous polyaniline nanomaterial, comprising the steps of:

[0026] Step 1) adding L-phenylalanine into deionized aqueous solution for primary dispersion, then adding aniline monomer for secondary dispersion, magnetically stirring and mixing, then adding ammonium persulfate aqueous solution dropwise and stirring at a reduced speed to obtain a mixed reaction solution;

[0027] Step 2) leaving the mixed reaction solution to react at low temperature;

[0028] Step 3) After the reaction, thawing and suction filtration, washing and vacuum freeze-drying to obtain flower-like porous polyaniline nanomaterials.

[0029] In step 1), the molar ratio of L-phenylalanine and aniline monomer is 1-8:24. The molar ratio of L-phenylalanine, aniline monomer and ammonium persulfate is 1:3-24:4-30. The time for magnetic stirring and mixing is 10-60 minutes, and the speed of magnetic stirring and mixing is 100-300 rpm. The dropping rate of the ammonium ...

Embodiment 1

[0033] A preparation method of flower-like porous polyaniline nanomaterials, comprising the following steps:

[0034] 1) Disperse 0.179g of L-phenylalanine in 500ml of deionized water, and disperse evenly with magnetic stirring; then add 0.86g of aniline monomer, and use a low-temperature cooling system to keep the mixed solution at 5°C for 60 minutes with magnetic stirring; 2.34 Disperse 5 g of ammonium persulfate in 500ml of deionized water, cool down to 5°C for pre-cooling; add the ammonium persulfate solution dropwise to the mixed solution of L-phenylalanine and aniline, and control the reaction temperature at 5°C;

[0035] 2) After the dropwise addition, stop the magnetic stirring, take out the magnetic stirring bar, and continue to place the mixed solution system at -5°C for 5 hours of static reaction;

[0036] 3) Remove the supernatant from the product obtained in step 2) and suction filter, wash with deionized water and absolute ethanol until the filtrate is colorless;...

Embodiment 2

[0038] A preparation method of flower-like porous polyaniline nanomaterials, comprising the following steps:

[0039] 1) Disperse 0.269g of L-phenylalanine in 500ml of deionized water, and disperse evenly with magnetic stirring; then add 0.86g of aniline monomer, and use a low-temperature cooling system to keep the mixed solution at 5°C for 60 minutes; Disperse 5 g of ammonium persulfate in 500ml of deionized water, cool down to 5°C for pre-cooling; add the ammonium persulfate solution dropwise to the mixed solution of L-phenylalanine and aniline, and control the reaction temperature at 5°C;

[0040] 2) After the dropwise addition, stop the magnetic stirring, take out the magnetic stirring bar, and continue to place the mixed solution system at -5°C for 5 hours of static reaction;

[0041] 3) Remove the supernatant from the product obtained in step 2) and suction filter, wash with deionized water and absolute ethanol until the filtrate is colorless; then freeze at -10°C for 10...

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Abstract

The invention discloses a preparation method of a flower-shaped porous polyaniline nanometer material, and belongs to the technical field of wave absorbing materials. The preparation method comprises the following steps of (1) adding L-phenylalanine into a deionized water solution, dispersing for the first time, adding an aniline monomer, dispersing for the second time, magnetically stirring and uniformly mixing, dropwise adding an ammonium persulfate water solution, and stirring in a decelerating way, so as to obtain a mixed reaction solution; (2) enabling the mixed reaction solution to stand, and reacting at low temperature; (3) after reaction is finished, thawing, sucking and filtering, washing, and performing vacuum freeze-drying, so as to obtain the flower-shaped porous polyaniline nanometer material. The invention also discloses the flower-shaped porous polyaniline nanometer material. The flower-shaped porous polyaniline nanometer material has the advantages that the electromagnetic wave receiving area is effectively increased; the maximum wave absorbing depth in microwave band of 2 to 18GHz is -39dB or above, and the -10dB below band width is 5.42GHz. The preparation method of the flower-shaped porous polyaniline nanometer material has the advantages that the preparation technology is simple, the cost is low, and the quality is controllable.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a flower-shaped porous polyaniline nanometer material and a preparation method thereof. Background technique [0002] In recent years, with the continuous advancement of science and technology, electronic products are flooding all aspects of our society, and the corresponding electromagnetic wave pollution is also a problem we need to face. Electrodeless electromagnetic wave absorbing and shielding materials are limited in scope of application due to their shortcomings such as large specific weight, high price, easy corrosion, and difficulty in adjusting the frequency band. [0003] Conductive polymers are widely used in the field of electromagnetic wave absorption and shielding due to their special electrochemical properties. Polyaniline is widely used as an electromagnetic wave absorbing and shielding material because of its diverse structures, goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C08J9/28C08K5/17C08L79/02
CPCC08G73/0266C08J9/28C08J2379/02C08K5/17C08L79/02
Inventor 刘健
Owner HEFEI NORMAL UNIV
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