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polymer fiber diameters, which were reduced to about 50% after carbonization, while Figure 2.2 shows a PAN nanofiber mounted on MEMS platform for nanofiber testing. Figure 3.2. Mechanical behavior of PAN nanofibers for different electrospinning conditions. The legend entries (in order) are voltage (kV), collector distance (cm) and nanofiber diameter (nm) [57]. PAN nanofibers spun at an average electric field of 1 kV/cm were found to outperform in properties those fabricated at higher field intensities as shown in Figure 3.2. Furthermore, nanofibers spun at the longest distances from the collector had the highest modulus and tensile strength, which pointed to improved molecular orientation that is critical for improved properties of the derived carbon nanofibers. It is significant to mention that the typical strain rates experienced by the polymer solution during electrospinning are of the order of 1,000 s-1 [58] which some researchers expect to promote increased molecular orientation in the resulting nanofibers. Indeed, increased molecular alignment was evidenced for some of the electrospinning conditions via FTIR measurements [59]: the orientation factors of the nanofibers that demonstrated the highest 24PDF Image | HIGH STRENGTH CARBON NANOFIBERS DERIVED FROM ELECTROSPUN POLYACRYLONITRILE
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