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Magnetic foams from polyurethane and magnetite applied as attenuators of electromagnetic radiation in X band
Author(s) -
Silva Ana Maria G.,
Pereira Iaci M,
Silva Tamara I.,
Silva Manoel R.,
Rocha Renata A.,
Silva Mercês C.
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49629
Subject(s) - materials science , scanning electron microscope , thermogravimetric analysis , polyurethane , composite material , fourier transform infrared spectroscopy , porosity , magnetometer , gas pycnometer , optics , chemical engineering , magnetic field , physics , quantum mechanics , engineering
In this work, electromagnetic radiation absorbent materials (ERAM) were prepared from expanded polyurethane and nano‐Fe3O4. The effect of porosity and charge content on the attenuation of incident radiation was investigated using helium gas pycnometry and the waveguide technique in the frequency range of 8 to 12 GHz (X‐band). ERAM were also characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and vibration sample magnetometer (VSM). Pure polyurethane absorbed 93.6% of the incident radiation at 11.8GHz. This result was attributed to its porous structure and low porosity. Although the content of open cells increases in ERAM with the increase in nanomagnetic content, materials containing 1% and 5% w/w absorbed more than 99% of the incident radiation. This behavior suggests that magnetic property of the charge is compensated for its action as a cell opener in these materials.