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HIGH STRENGTH CARBON NANOFIBERS DERIVED FROM ELECTROSPUN POLYACRYLONITRILE

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HIGH STRENGTH CARBON NANOFIBERS DERIVED FROM ELECTROSPUN POLYACRYLONITRILE ( high-strength-carbon-nanofibers-derived-from-electrospun-pol )

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1.3. CNFs by Heat Treatment of PAN Nanofibers Fabrication of CNFs from PAN proceeds with stabilization in an oxidative atmosphere between 250–300°C while the PAN nanofibers are being subjected to tension. During stabilization, PAN undergoes cyclization and partly dehydrogenation, which make it denser and help to retain its fibrous structure during subsequent high temperature carbonization [26,28]. Stabilization is an exothermic process and results in a ring structure, also known as ladder structure, which contains a carbon-nitrogen double bond as shown in Figure 1.3. PAN Precursor Stabilization of PAN Carbonization Figure 1.3. Molecular changes occurring during conversion of PAN to carbon by stabilization and carbonization heat treatments. (Figure has been reproduced after reference [26]) 6

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