Dielectric microwave absorbing material processed by impregnation of carbon fiber fabric with polyaniline

Abstract

It is a known fact that the adequate combination of components and experimental conditions may produce materials with specific requirements. This study presents the effect of carbon fiber fabric impregnation with polyaniline conducting polymer aiming at the radar absorbing material processing. The experiments consider the sample preparation with one and two impregnations. The prepared samples were evaluated by reflectivity measurements, in the frequency range of 8-12 GHz and scanning electron microscopy analyses. The correlation of the results shows that the quantity of impregnated material influences the performance of the processed microwave absorber. This study shows that the proposed experimental route provides flexible absorbers with absorption values of the incident radiation close to 87%

Nanostructured composites based on carbon nanotubes and epoxy resin for use as radar absorbing materials

“…In certain frequency bands, these materials attenuate the incident electromagnetic wave radiation and dissipate the energy absorbed in the form of heat through internal mechanisms, magnetic and/or dielectrics. These loss mechanisms can be physical, chemical or simultaneously both 3,4 . Increased electromagnetic pollution due to the presence of microwaves and the use of stealth technology in defense systems and military platforms have been the major attractions for studies in this area, with investments in research that already cover the frequency range of .…”

“…In civilian applications, the RAM use brings benefits in different areas, such as in telecommunication area coating cell phones and radio transmitting antennas; in medical sector coating, for example, electronic pacemakers and equipment; in anechoic chambers used for research and industrial purposes; in home appliances in general, in electromagnetic shielding and control of interference, among other applications [8][9][10] . Usually, microwave absorbing coatings are composite materials that may present itself in various forms such as plates of elastomeric polymers based on polyisoprene and polychloroprene; flexible blankets of different types of rubbers and paints based on epoxy, phenolic and polyurethane resins 3,11,12 . An important characteristic of these composites is the possibility to adjust their electrical and magnetic properties to optimize the attenuation of incident microwaves.…”

Microwave Absorption and Electrical Properties of Coated Polyester Fabric with Cobalt Ferrite and Polyaniline

“…4(b), the minimum RL reached -18.1 dB (>90% absorption) at 11.5 GHz and the effective absorption bandwidth exceeding -10 dB was 2.8 GHz (9.6-12.4 GHz) with the matching thickness of 3 mm. Compared with Ref [7][8][9], the CoFe 2 O 4 -PANI/PET fabric prepared by this method had lower fill density for magnetic materials and stronger adsorption capacity which suggessting its potential application in microwave adsorption fields.…”

“…Therefore, in order to protect the body from harm of these EM wave, the design and exploration of EM wave absorption fabric have attracted a great deal of interest which desired to effectively attenuate EM energy by dissipating them through interference and converting them into thermal energy [4][5][6]. As a result, several kinds of EM wave absorption fabrics have already been prepared by coating magnetic materials [7] as well as intrinsically conducting polymers (ICP) such as polypyrrole (PPY) [8] and polyaniline (PANI) [9]. However, there are still certain unsolved problems in these EM wave absorption fabrics, for instance, high fill density of magnetic materials [7], weak absorption capacity and narrow band adsorption for ICP materials [8,9].…”

“…As a result, several kinds of EM wave absorption fabrics have already been prepared by coating magnetic materials [7] as well as intrinsically conducting polymers (ICP) such as polypyrrole (PPY) [8] and polyaniline (PANI) [9]. However, there are still certain unsolved problems in these EM wave absorption fabrics, for instance, high fill density of magnetic materials [7], weak absorption capacity and narrow band adsorption for ICP materials [8,9]. Therefore, it is necessary to develop a novel EM wave absorption fabric which could overcome these problems.…”