The porous structure of polyacrylonitrile (PAN)-based activated carbon fibers (ACFs) was studied by means of nitrogen adsorption over a wide range of relative pressure and scanning electron microscopy (SEM). The specific surface area of samples was evaluated using the standard BET method. The microp
Evolution of microvoids in PAN-based carbon fibers
β Scribed by Deng-hua Li; Gang-ping Wu; Chun-xiang Lu; Yong-hong Li; Fu He; Zhi-hai Feng; Xiu-tao Li; Yu-ming Guo
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 38 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0008-6223
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β¦ Synopsis
instead of the commonly-used alkaline-acid method. The process parameters were optimized. Results showed that the fixed carbon mass fraction achieved by this method could be as high as 99.9% under the optimal conditions while that by the alkaline-acid method was only 85.8%, indicating that the alkaline roastingleaching method was very effective to improve the fixed carbon content of the graphite.
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Graphite fibers were developed from polyacrylonitrile (PAN) fibers which were modified with potassium permanganate. After the transitional temperature, the formation of graphite structures commenced, the crystals increased in thickness, and the preferred orientation of the fiber crystals increased.
Results from a study of the "recoil from tension" method for estimating the compressive strength of the poiyacrylonitrile (PAN)-based carbon fibers are reported here. Analysis of the effect of different gauge lengths on the recoil strength distribution and the fracture morphological features of cros
The present work is concerned with the spinning of two series of blend fibers containing acrylic copolymer (PAC) and small amount of secondary polymer, such as polyvinyl acetate ( PVAc) , polystyrene ( PS ) , acrylonitrile-styrene (AS) and acrylonitrile-vinyl acetate ( AVAc) copolymers. The blend ac
The formation and evolution of structure, and the changes of properties during the preoxidation, precarbonization, and carbonization of different PAN precursors were studied by the combination of DSC, FT-IR, SEM and some traditional measurements, such as density and mechanical properties of various