Effect of chlorination with carbon tetrachloride on the interaction of carbon fibers with electromagnetic radiation in the ultrahigh-frequency band

Grishchenko, Liudmyla M.; Moiseienko, Vladyslav A.; Diyuk, Vitaliy E.; Boldyrieva, Olga Yu.; Vakaliuk, Anna V.; Malyshev, V. Yu.; Matushko, Igor P.; Mischanchuk, Oleksandr V.; Lisnyak, Vladyslav V.

doi:10.1007/s13204-023-02892-5

Cited by 3 publications

(6 citation statements)

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“…During bromination, up to 6 wt % of bromine was incorporated into AC. In addition, AC/Br 2 shows a 2‐fold increase in oxygen concentration, indicating parallel oxidation of the carbon surface and the formation of various oxygen‐containing groups [26] . The structure of the apricot pits, from which the AC was derived, is shown in the SEM micrographs (Figures 1a, b).…”

Section: Resultsmentioning

confidence: 97%

“…However, the AC/Br 2 sample shows a slightly lower thermal stability. Both the AC and AC/Br 2 samples contained a significant amount of water, as evidenced by the large weight loss when heated to 130 °C [26] . The AC/Br 2 sample contained 6 % more water than the AC sample.…”

Section: Resultsmentioning

confidence: 99%

“…The AC/Br 2 sample contained 6 % more water than the AC sample. Further heating to ∼520 °C results in a weight loss of 5–9 %, which is probably due to the decomposition of thermally unstable oxygen‐containing groups, such as carboxylic, anhydride, and lactone groups [26,27] . The weight loss of AC/Br 2 was greater at below 520 °C because the constitutional bromine was detached, hydrogenated, and thermodesorbed in the form of HBr, whereas AC contains no bromine.…”

Section: Resultsmentioning

confidence: 99%

“…Further heating to ~520 °C results in a weight loss of 5-9 %, which is probably due to the decomposition of thermally unstable oxygencontaining groups, such as carboxylic, anhydride, and lactone groups. [26,27] The weight loss of AC/Br 2 was greater at below 520 °C because the constitutional bromine was detached, hydrogenated, and thermodesorbed in the form of HBr, whereas AC contains no bromine. These observations indicate that bromination occurred, and many bromine-containing functional groups were grafted onto the carbon surface in parallel with the surface oxidation, as confirmed by the SEM/EDX data.…”

Section: Morphological Structural and Elemental Microanalysis Of The ...mentioning

confidence: 99%

“…Both the AC and AC/Br 2 samples contained a significant amount of water, as evidenced by the large weight loss when heated to 130 °C. [26] The AC/Br 2 sample contained 6 % more water than the AC sample. Further heating to ~520 °C results in a weight loss of 5-9 %, which is probably due to the decomposition of thermally unstable oxygencontaining groups, such as carboxylic, anhydride, and lactone groups.…”

Section: Morphological Structural and Elemental Microanalysis Of The ...mentioning

confidence: 99%

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Microwave Properties of Composite Films Based on Polyvinyl Chloride and Brominated Activated Carbon

Grishchenko,

Zhytnyk,

Matushko

et al. 2024

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Brominated activated carbon (AC/Br2) powder was used as a filler in poly(vinyl chloride) (PVC) to prepare PVC‐based composite films by hot pressing. The AC/Br2 filler was obtained by liquid phase bromination and contained both oxygen and bromine. In comparison with the unmodified AC, the AC/Br2 was subjected to thermogravimetric analysis in air and argon and temperature‐programmed desorption mass spectrometry in vacuum, which identified carbon‐oxygen and bromine groups and showed the comparable thermal stability of AC/Br2 and AC. XPS shows the predominance of phenolic groups among the carbon‐oxygen groups. Scanning electron microscopy and transmission electron microscopy showed preserved morphology and microstructure, while N2 adsorption showed a microporosity decrease after bromination. FTIR analysis suggested non‐chemical interactions between PVC and AC/Br2. As the AC/Br2 content in the PVC‐based composite films increases from 0.2 to 30 wt %, the electromagnetic radiation (EMR) reflection at Ka‐band microwave frequencies increases. To reduce the EMR reflection, the proposed composite films should contain a maximum of 0.2 wt % AC/Br2. The results indicate that the microwave properties of PVC‐based composite films can be tuned by adjusting the AC/Br2 content.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Morphological Structural and Elemental Microanalysis Of The ...mentioning

confidence: 99%

Section: Morphological Structural and Elemental Microanalysis Of The ...mentioning

confidence: 99%

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