Carbonization of oriented poly(vinyl alcohol) fibers impregnated with potassium bisulfate
| Autor: | Kurkin Tikhon, Ivan’kova Elena, Golubev Eugenii, Zelenetskii Alexander, Petkieva Diana, Ozerin Alexander |
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| Rok vydání: | 2020 |
| Předmět: |
Vinyl alcohol
Materials science Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 01 natural sciences Inorganic Chemistry Potassium bisulfate chemistry.chemical_compound symbols.namesake Materials Chemistry Cellulose Fourier transform infrared spectroscopy Renewable Energy Sustainability and the Environment Carbonization Small-angle X-ray scattering Process Chemistry and Technology Organic Chemistry Atmospheric temperature range 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Chemical engineering Ceramics and Composites symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | Carbon Letters. 30:637-650 |
| ISSN: | 2233-4998 1976-4251 |
| Popis: | The structural transformationss of oriented poly(vinyl alcohol) (PVA) fibers impregnated with potassium bisulfate (PBS) were studied in detail on the way from PVA precursor fibers till carbonized at a temperature of 1000 °C fibers. It has been shown that the impregnation of PVA fibers with a sulfur-containing compound (PBS) is an efficient technique to decrease the thermoplasticity of PVA fibers during heat treatment at high temperatures in air and argon and contributes to a high yield of coke residue after heat treatment up to 1000 °C. TMA, TGA, DSC, mass spectrometry, FTIR, Raman spectroscopy, SEM, WAXS and SAXS were used to study the structural transformations of oriented PVA fibers impregnated with PBS at the stages of their preliminary thermal stabilization (215 °C), thermal stabilization (215–400 °C) and carbonization (400–1000 °C). A reaction scheme has been proposed that fully describes carbonization chemistry in the entire studied temperature range. The processing temperature of 215 °C was found to be optimal for preliminary thermal stabilization of PVA fibers impregnated with PBS. The heat treatment in an inert medium can be recommended as the optimal for thermal stabilization of fibers impregnated with PBS. The characteristics of the carbonized PVA fibers, such as strength, modulus and electrical conductivity, were close to the characteristics of commercial cellulose-based carbon fibers yarns. |
| Databáze: | OpenAIRE |
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