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Chiral planar spiral PPy/Fe3O4 composite broadband microwave absorbent as well as preparation method and application thereof

A microwave absorbing agent, plane spiral technology, applied in chemical instruments and methods, climate sustainability, other chemical processes, etc., can solve the problem that the absorbing performance is difficult to meet the requirements of thin, light, wide, strong, and the shape and size are difficult to control. Problems such as poor experimental repeatability, to achieve the effect of good industrial application potential, excellent microwave absorption characteristics, and low instrument precision requirements

Active Publication Date: 2021-07-09
ZHEJIANG NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shape and size of the existing composite absorbing materials are difficult to control, the experimental steps are cumbersome, the conditions are harsh, the operation is complicated, and the repeatability of the experiment is poor. In addition, its absorbing performance is difficult to meet the requirements of "thin, light, wide, and strong".

Method used

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  • Chiral planar spiral PPy/Fe3O4 composite broadband microwave absorbent as well as preparation method and application thereof
  • Chiral planar spiral PPy/Fe3O4 composite broadband microwave absorbent as well as preparation method and application thereof
  • Chiral planar spiral PPy/Fe3O4 composite broadband microwave absorbent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A planar helical polypyrrole and a preparation method thereof, specifically comprising the following steps:

[0056] 0.5465g C 19 h 42 BrN(CTAB), dissolved in 150mL deionized water, stirred magnetically at 40°C for 10min, a colorless solution was formed; then the solution was placed in an ice bath and allowed to stand for 1h to crystallize; 1.027g (NH 4 ) 2 S 2 o 8 (APS) was dissolved in 25mL deionized water, and added to the above solution at one time, after an interval of 10s, add 0.5mL C 4 h 5 N(py), stirred for 10 minutes to make the solution evenly mixed, stood at 0-3°C for 24h, washed alternately with absolute ethanol and deionized water, dried in a vacuum freeze-drying oven at -60°C, and finally obtained the plane Helical polypyrrole.

[0057] The phase and morphology of the obtained product measured under XRD and scanning electron microscope are as follows: Figure 1~2 shown. From the above analysis, it can be seen that the product is a single-chain ult...

Embodiment 2

[0060] A Chiral Planar Helical PPy / Fe 3 o 4 Composite broadband microwave absorber and preparation method thereof, composite microwave absorbing material containing same, the specific steps include:

[0061] 1.35g FeCl 3 ·6H 2 O, 12 mL of deionized water, 0.19 mL of PAA, 0.5 g of the PPy precursor prepared in Example 1 were added to 40 mL of ethylene glycol solution, after magnetic stirring for 30 min, 1.6406 g of NaAc was added and stirring continued for 2 h, and then the solution was transferred to a poly Put it in a tetrafluoroethylene liner, put it into a high-temperature oven, react at a high temperature of 200 ° C for 12 hours, cool it naturally to room temperature, wash it alternately with absolute ethanol and deionized water, and dry it in a vacuum freeze-drying oven at -60 ° C to finally obtain the described Growth of Fe on the Surface of Planar Helical Polypyrrole 3 o 4 composite of particles.

[0062] The phase, composition, electromagnetic properties and morp...

Embodiment 3

[0065] A Chiral Planar Helical PPy / Fe 3 o 4 Composite broadband microwave absorber and preparation method thereof, compared with the preparation steps disclosed in Example 2, the only difference is: Fe 3+ The concentration is 0.128M, and the rest of the preparation steps and process parameters are the same.

[0066] The phase and morphology of the obtained product measured under XRD and scanning electron microscope are as follows: Figure 10-12 shown. Among them, the atomic percentage of Fe and C is 1:6.9.

[0067] It can be seen from the analysis that the content of ferric oxide particles coated on the surface of the product is obviously more than that in Example 2.

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Abstract

The invention belongs to the field of microwave absorption, and discloses a chiral planar spiral PPy / Fe3O4 composite broadband microwave absorbent as well as a preparation method and application thereof. The planar spiral polypyrrole with unique morphology is prepared by taking a surfactant as a soft template and adopting a chemical oxidative polymerization reaction method, and the diameter of the planar spiral polypyrrole is 20-40 microns. By taking the material as a precursor, the compound of chiral polypyrrole and Fe3O4 is prepared from the precursor, ferric salt and other raw materials through a dissolution heat method; not only is the morphology novel and unique, but also the content and size of Fe3O4 growing on the surface of polypyrrole can be regulated and controlled by changing the concentration of iron ions in the system and the volume of the added deionized water; and the material has excellent microwave absorption characteristics. The controllable preparation process disclosed by the invention is simple, the product morphology is novel, the characteristics that the reaction conditions are harsh, the morphology of the reaction product is difficult to regulate and control, the experimental repeatability is poor and the like in the previous preparation process are overcome, and the industrial application potential is good.

Description

technical field [0001] The invention belongs to the field of microwave absorption, in particular to chiral planar helical PPy / Fe 3 o 4 Composite broadband microwave absorber and its preparation method and application. Background technique [0002] Chiral conductive polymers have a high degree of π-π conjugated polymer chains and metal-like conductivity, good processability, easy-to-tunable band gap, and rich electrical activity. They are widely used in chiral sensors, supercapacitors, and other fields. There are extensive studies. Moreover, because of their unique advantages such as good environmental stability, low cost, low density, adjustable conductivity, and larger frequency conversion absorption range, they also have great potential for application in the field of electromagnetic wave absorption. [0003] The morphology of high-performance electromagnetic absorbing materials is another important factor that determines their performance. At present, the common morph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/04C08K3/22C08G73/06C09K3/00
CPCC08K3/22C09K3/00C08G73/0611C08K2201/011C08K2003/2275C08K2201/005C08L2203/20C08L79/04Y02P20/10
Inventor 童国秀杨小芬范宝新陈大波吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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