Investigation of Polycondensation of Hexamethylene-Meter  and Minerals of Obtaining Products

Melezhik, A. V.; Alekhina, Olga V.; Gerasimova, A. V.; Ткачев, А. Г.

doi:10.17277/vestnik.2017.03.pp.461-470

Cited by 1 publication

(2 citation statements)

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“…Earlier, we assumed that the carbon-containing substance formed during the polycondensation of HMTA in anhydrous sulfuric acid or dilute oleum [2,3] contains fragments of a polycumulene structure. The activation of such substances with potassium hydroxide has not been previously studied.…”

Section: Resultsmentioning

confidence: 99%

“…The synthesis of a carbon-containing substance of a supposed cumulene structure with the code name "polycumulen" was carried out by analogy with the synthesis of a soluble substance of a supposed cumulene structure described in [2,3]. However, in the present research, the heat treatment temperature was increased to 180 -200 °C for deeper polymerization, which resulted in an insoluble product.…”

Section: Amandtmentioning

confidence: 96%

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Synthesis of Carbon Materials with Abnormally High Specific Surface Area

Melezhik¹,

Smolsky²,

Zelenin³

et al. 2019

AM&T

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As a rule, carbon materials with developed energy are produced by physical or active activation of carbon-containing precursor materials. Physical activation is usually carried out at a temperature of 800-900 °C. For chemical activation, many reagents have been proposed-phosphoric acid, zinc chloride, potassium sulfide, sodium hydroxide, potassium hydroxide, potassium carbonate, and others. All these techniques are aimed at increasing the specific surface and porosity of the original carbon nanomaterials. The presented paper describes the synthesis technology for substances, presumably of a cumulene structure, based on the polycondensation of hexamethyltetramine in anhydrous sulfuric acid. A change in the heat treatment modes makes it possible to intensify the polymerization process, which results in synthesis products that are insoluble in an aqueous medium. Optionally, carbon nanotubes were added to the reaction system. The substances obtained were activated with potassium hydroxide. The analysis of the specific surface area of the synthesized materials showed extremely high values (4288-5346 m 2 /g). Increasing the ratio of potassium hydroxide to the initial carbon substance leads to increasing the pore width. The addition of carbon nanotubes to the initial substance dramatically increasesthe pore width. The activated materials can be used as effective adsorbents and electrode materials for chemical current sources.

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Section: Resultsmentioning

confidence: 99%

Section: Amandtmentioning

confidence: 96%