DOI: 10.18503/1995-2732-2021-19-4-71-81
Abstract
An active distribution of cellular systems, new data transfer technologies, such as 4G and 5G, and a distributed system of high-voltage electric transmission lines have resulted in an increase in electromagnetic radiation to environment. To minimize effect of electromagnetic radiation, we may use materials capable of absorbing or reflecting it. The paper presents studies on the morphology and properties of the interaction between nanocomposite materials based on polyurethane and multiwall carbon nanotubes (MWCNTs) with electromagnetic radiation (EMR). The authors studied polyurethane with MWCNT within a range of mass concentration from 0.5 to 8% by weight. To determine optical characteristics of composite materials within a microwave range (effects of electromagnetic radiation transmission, reflection and absorption), the authors used a scalar network analyzer built on a sweep generator, a waveguide slotted line, a block of an analyzer and a signal processing system. The research conducted showed that the composites based on polyurethane with 2 and 4% by weight of MWCNT were characterized by the highest absorption coefficients, namely from ~ 55 to ~ 62% of EMR in the frequency range from 9.5 to 12 GHz. It was revealed that polyurethane with 8 % by weight of MWCNT showed a slight change in the absorption coefficient from ~ 37 to ~ 42%. An increase in the concentration of MWCNT in polyurethane to 4 % by weight results in forming inclusions of MWCNT on the upper side of the sample. Maximum concentration of MWCNT, amounting to 8% by weight, results in non-uniformity of the upper side of the sample with a developed surface, which is mostly covered with agglomerations of MWCNT. All the composites showed a non-monotonic decrease in the reflection coefficient and an increase in the absorption coefficient with increasing measuring frequency.
Keywords
Multiwall carbon nanotubes, modification, elastomers, polyurethane, electromagnetic radiation, surfactants, transmission electron microscopy.
For citation
Shchegolkov A.V., Shchegolkov A.V., Komarov F.F., Parfimovich D.I. Composite Nanostructured MWCNT/Polyurethane Material for Protection Against Electromagnetic Radiation. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2021, vol. 19, no. 4, pp. 71–81. https://doi.org/10.18503/1995-2732-2021-19-4-71-81
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