@Article{PintoMachGomeReze:2018:ElMoSt,
author = "Pinto, Simone de Souza and Machado, Jo{\~a}o Paulo Barros and
Gomes, Newton A. S. and Rezende, Mirabel Cerqueira",
affiliation = "{Universidade Federal de S{\~a}o Paulo (UNIFESP)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and {Universidade
Federal de S{\~a}o Paulo (UNIFESP)}",
title = "Electromagnetic, morphological and structural characterization of
microwave absorbers based on POMA/magnetic filament composites",
journal = "Journal of Magnetism and Magnetic Materials",
year = "2018",
volume = "449",
pages = "406--414",
keywords = "Metallic filamentsPOMACompositesMicrowave absorber.",
abstract = "This study aims to combine dielectric and magnetic properties of
different materials in an unique composite. For this,
poly(o-methoxyaniline), POMA, was chemically synthesized in situ
on magnetic metallic filaments (MF). The obtained composite was
inserted into an epoxy resin matrix in the proportions of 40, 50
and 70%, in weight (wt%). The samples were characterized by
scanning electron microscopy (SEM), X ray diffraction (XRD) and
electromagnetic measurements. On the last case, the measurements
considered the reflectivity and the complex parameters of
electrical permittivity and magnetic permeability in the frequency
range of 8.212.4 GHz (X-band). Specimens with different
thicknesses were evaluated by reflectivity. XRD results show that
the filaments are based on Fe-\α steel and SEM analyses show
the good incorporation of POMA/MF in the epoxy resin composite.
The complex parameters show that the real component of
permittivity shows the largest variation with the POMA/MF
concentration increasing in epoxy resin and the loss tangent
indicates that the magnetic losses are preponderant on dielectric
ones. The reflectivity measurements show that the 5 mm-specimen
with 50\ wt% of POMA/MF presents the best result of
attenuation (\−21.5\ dB, i.e. above 99% of
attenuation). Already, the sample containing 70\ wt% shows
the worst performance (up to \−9.0\ dB). The
increase of POMA/MF concentration in epoxy resin confers maximum
attenuation values for less thick specimens. The results show that
the combination of dielectric and magnetic materials in a
composite contributes for the improvement of microwave absorbing
performance, and extends the possibilities of RAM processing with
different characteristics.",
doi = "10.1016/j.jmmm.2017.09.073",
url = "http://dx.doi.org/10.1016/j.jmmm.2017.09.073",
issn = "0304-8853",
label = "lattes: 5076862030728693 2 SouzaPintoMachGomeReze:2017:ElMoSt",
language = "en",
targetfile = "pinto_electromagnetic.pdf",
urlaccessdate = "27 abr. 2024"
}