A kind of flower-shaped porous polyaniline nanomaterial and preparation method thereof

A nano-material, polyaniline technology, applied in the field of wave-absorbing materials, can solve the problems of porous and loose polyaniline composite materials with complex steps, unfavorable industrial application and cost control, uneven molecular weight distribution of in-situ polymerization, etc., to achieve enhanced absorption and Effects of multiple reflections, increased electromagnetic wave receiving area, and light specific gravity

Active Publication Date: 2019-04-23
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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  • A kind of flower-shaped porous polyaniline nanomaterial and preparation method thereof
  • A kind of flower-shaped porous polyaniline nanomaterial and preparation method thereof
  • A kind of flower-shaped porous polyaniline nanomaterial 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 nanomaterial, which belongs to the technical field of wave-absorbing materials, and comprises the following steps: step 1) adding L-phenylalanine into a deionized aqueous solution for one dispersion, and then adding aniline mono Carry out secondary dispersion, magnetic stirring and mixing, then dropwise add ammonium persulfate aqueous solution and slow down stirring to obtain a mixed reaction solution; step 2) leave the mixed reaction solution to react at low temperature; step 3) after the reaction, thaw, and suction filter Afterwards, washing, vacuum freeze-drying to obtain flower-like porous polyaniline nanomaterials. The invention also discloses a flower-shaped porous polyaniline nanomaterial; the flower-shaped porous polyaniline nano-material of the present invention effectively increases the electromagnetic wave receiving area, and the maximum wave absorption depth in the 2-18GHz microwave frequency band reaches more than -39dB, -10dB The following bandwidth reaches 5.42 GHz. The preparation method of a flower-shaped porous polyaniline nano material of the present invention has simple preparation process, low cost and controllable quality.

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 Patents(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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