Preparation and electromagnetic microwave absorption performances of sulfurated and oxidized polyacrylonitrile carbon fibers

• Published in: Molecular Crystals and Liquid Crystals Vol. 751; no. 1; pp. 1 - 9
• Main Authors: Grishchenko, Liudmyla M., Moiseienko, Vladyslav A., Goriachko, Andrii M., Vakaliuk, Anna V., Matushko, Igor P., Mischanchuk, Oleksandr V., Tsapyuk, Galyna G., Boldyrieva, Olga Yu, Lisnyak, Vladyslav V.
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 22.01.2023; Taylor & Francis Ltd
• Subjects: Absorption; Carbon fiber reinforced plastics; Chemical analysis; Electromagnetic radiation; High temperature; Hydrogen peroxide; Microwave absorption; microwaves; Polyacrylonitrile; polyacrylonitrile carbon fibers; radiation-absorbent materials; Reflectance; Stability analysis; Sulfur; sulfuration; Thermal stability; Voltage standing wave ratios; Wave attenuation
• ISSN: 1542-1406; 1563-5287; 1527-1943
• DOI: 10.1080/15421406.2022.2073045

Polyacrylonitrile carbon fibers (PAN CFs) were sulfurated at high temperatures and then oxidized with an H 2 O 2 solution. Thermal and chemical analysis showed high thermal stability and the sulfur content up to 4 mmol g −1 . From the microwave absorption studies, the voltage standing wave ratio and the attenuation through one adsorbent layer decrease almost linearly with increasing frequency. The reflection coefficient equals 0.79 ± 0.017 and 0.473 ± 0.02 at 10 and 30 GHz. "Transparency windows" with a bandwidth of about 300 MHz are observed at 30 and 36 GHz. The 1000 times attenuation of the signal power is found at 30 GHz.