Funct. Mater. 2022; 29 (1): 72-80.

doi:https://doi.org/10.15407/fm29.01.72

Microwave absorption in carbon fibers Ural N-24 and their composites based on polyamide Phenilone C-2

A.A. Konchits1, B.D. Shanina1, S.V. Krasnovyd1, A.I. Burya2, A.-M. V. Tomina2, Ye.A. Yeriomina2

1V. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine, 03028, 41 Nauki av., Kyiv, Ukraine
2Dniprovsk State Technical University, 51918, 2 Dniprobudivska str., Kamyanske, Ukraine

Abstract: 

Properties of the resonance (EPR, FMR) and non-resonance microwave absorption (NMA) in carbon fibers (CFs) Ural N-24 and powder samples of Phenilone C-2 /CFs composites were studied using a 3-cm EPR spectrometer "Radiopan" SE/X-2544. It was shown that the EPR signals of carbon fibers are mainly due to free electrons. They form response as of symmetric (Lorentz shape) or asymmetric (Dyson shape) EPR line, depending on the fulfillment of the conditions: d << δ or d >> δ, where d is the thickness of CFs threads or bundles; δ is the skin layer thickness for a given wave frequency. The effect of a strong NMA in CFs and PhC-2 /CFs composites due to the non-resonant absorption of the microwaves by free carriers was found. It is shown that the magnitude of the NMA effect can be controlled by changing both the concentration of CFs in the composite and the density of the powder. The latter determines electrical contact between the individual particles. It is established the fact of the formation of strong ferromagnetic resonance (FMR) signals in composites. The magnitude of the FMR signal increases non-linearly with increasing of CFs concentration. To explain this effect, a model is proposed taking into account the role of the technological process of magnetic mixing of the powder accompanied by the friction of strong carbon fibers with ferromagnetic additives. The FM material's micro- and nanoparticles are split off in this process and give rise to the ferromagnetic or superparamagnetic properties of the prepared composites.

Keywords: 
carbon fibers, polyamide-based composites, electron paramagnetic resonance, nonresonant microwave absorption

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