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Preparation method of graphene oxide-polyaniline composite electromagnetic shielding material

A technology of composite electromagnetic and shielding materials, which is applied in the field of preparation of graphene oxide/polyaniline composite electromagnetic shielding materials, can solve the problems of increasing interface polarization and low conductivity between graphene oxide and polyaniline contact layers, and achieve good Electromagnetic wave shielding effectiveness, increased interface polarization, and easy-to-obtain raw materials

Inactive Publication Date: 2016-01-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of graphene oxide-polyaniline composite electromagnetic shielding material, grow a layer of oriented polyaniline nanorods on the surface of graphene oxide, and use the electrical conductivity of polyaniline to improve the conductivity of graphene oxide itself Low problem, and also increase the interface polarization between graphene oxide and polyaniline contact layer, so as to achieve good shielding effect on electromagnetic waves

Method used

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  • Preparation method of graphene oxide-polyaniline composite electromagnetic shielding material
  • Preparation method of graphene oxide-polyaniline composite electromagnetic shielding material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Add 0.0204 g of graphene oxide and 35 mL of perchloric acid aqueous solution with a concentration of 1 mol / L into the reaction flask, treat with ultrasound for 30 min, then add 183 μL of aniline, stir magnetically for 30 min, and record it as solution I.

[0020] 2) Dissolve 0.3047 g of ammonium persulfate into 5 mL of perchloric acid aqueous solution with a concentration of 1 mol / L to form solution II.

[0021] 3) Then, solution I and solution II were mixed in an ice-water bath and reacted for 24 hours under stirring to obtain a dark green product dispersion. Washing with deionized water, absolute ethanol and acetone until pH 6-7 is close to neutral, filtering and drying to obtain dark green graphene oxide-polyaniline composite electromagnetic shielding powder material.

Embodiment 2

[0023] The powder material prepared in Example 1 is mixed with paraffin into samples with different contents, the mass percentages of the powder material are respectively 10wt%, 20wt%, 30wt%, 40wt%, 50wt% and 60wt%, and then it is respectively pressed into An annular piece with an outer diameter of 7mm, an inner diameter of 3.04mm and a thickness of 3mm was placed in the Maury2553T7.5 air line of the Agilent E5071c vector network analyzer for testing. The test results are as follows figure 1 shown.

Embodiment 3

[0025] The powder material prepared in Example 1 was mixed with thermoplastic polyurethane (TPU) by solution mixing method to prepare sample films with different contents, the mass percentages of the powder material were 1wt%, 3wt%, 5wt% and 10wt%, and then Cut out a circular test film with an outer diameter of 7mm, an inner diameter of 3.04mm and a thickness of 2mm, and place it in the Maury2553T7.5 air line of the Agilent E5071c vector network analyzer for electromagnetic shielding effectiveness testing. The test results are as follows figure 2 b- figure 2 shown in f. Cut out a circular sheet with a diameter of 7mm on the corresponding film, and use the voltage-current method to test the conductivity of the corresponding film. The test results are as follows figure 2 as shown in a.

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Abstract

The invention discloses a preparation method of a graphene oxide-polyaniline composite electromagnetic shielding material. The method comprises the steps that ultrasonic dispersion is performed on graphene oxide in an aqueous perchloric acid solution, aniline is added, and the mixture is mixed evenly under magnetic stirring to obtain a first solution; ammonium persulfate is put into the aqueous perchloric acid solution, and ultrasonic dispersion is performed to obtain a second solution; the second solution is added in the first solution, continuous stirring and reacting are performed in an ice bath for 24 h to obtain a dispersing solution of a product, the dispersing solution is sequentially washed with deionized water, ethyl alcohol and acetone until the pH value is 6-7, filtering and drying are performed, and then the graphene oxide-polyaniline composite electromagnetic shielding material is obtained. According to the preparation method of the graphene oxide-polyaniline composite electromagnetic shielding material, a layer of directional polyaniline nanorods grow on the surface of the graphene oxide, the electric conductivity of the graphene oxide is improved through the conductive property of the polyaniline, interfacial polarization of contact layer faces of the graphene oxide and polyaniline is improved, and therefore the good electromagnetic wave shielding effectiveness is achieved; the technological processes are simple, the raw materials are easy to obtain, and application and popularization are easy.

Description

technical field [0001] The invention relates to a preparation method of a composite electromagnetic shielding material, in particular to a preparation method of a graphene oxide / polyaniline composite electromagnetic shielding material. Background technique [0002] With the rapid development of modern science and technology, various electrical equipment and wireless communication equipment have brought us a lot of electromagnetic radiation while bringing us convenience. Now electromagnetic waves have become another after water pollution, air pollution and noise pollution. It is a new source of pollution that has great harm and is not easy to protect. Electromagnetic wave pollution not only adversely affects the surrounding equipment, but also endangers the living environment and human health in severe cases. The preparation of high-performance electromagnetic shielding materials for electromagnetic wave protection has important theoretical significance and application value....

Claims

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Application Information

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IPC IPC(8): C08G73/02C08K3/04
Inventor 俞豪杰任福杰王立邓正
Owner ZHEJIANG UNIV
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