Effect of low processing rate on homogeneous microstructural evolution of polyacrylonitrile-based carbon fibers
| Autor: | Yun Hyuk Bang, Dae Ho Kim, Yoong Ahm Kim, Sung-Ryong Kim, Kap Seung Yang, Go Bong Choi, Bo-Hye Kim, Doo Won Kim, Duck J. Yang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Scanning electron microscope Carbonization Process Chemistry and Technology Organic Chemistry Polyacrylonitrile Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Crystallinity chemistry Materials Chemistry Ceramics and Composites Extrusion Fiber Composite material 0210 nano-technology Spinning |
| Zdroj: | Carbon Letters. 29:479-485 |
| ISSN: | 2233-4998 1976-4251 |
| DOI: | 10.1007/s42823-019-00047-7 |
| Popis: | This study demonstrates that low processing rate for producing polyacrylonitrile (PAN)-based carbon fiber is a critical to obtain a homogeneous radial microstructure with high resistance to oxidation, thereby resulting in their improved mechanical strength. The dry-jet wet spun PAN organic fibers were processed (e.g., stabilized and then carbonized) utilizing two different rates; one is 1.6 times longer than the other. The effect of processing rate on the microstructural evolutions of carbon fibers was analyzed by scanning electron microscopy after slow etching in air, as well as Raman mapping after graphitization. The rapidly processed fiber exhibited the multilayered radial structure, which is caused by the radial direction stretching of the extrusion in the spinning. In case of the slowly processed fiber, the layered radial structure formed in the spinning process was changed into a more homogeneous radial microstructure. The slowly processed fibers showed higher oxidation resistance, higher mechanical properties, and higher crystallinity than the rapidly processed one. Raman mapping confirmed that the microstructure developed during spinning was sustained even though fiber was thermally treated up to 2800 °C. |
| Databáze: | OpenAIRE |
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