Abstract:

Electrospunnanofibers from Polyacry lonitrile(PNA) with high molecular weight of 300,000 and its mixture of PAN/PMMA were prepared , then oxidized and carbonized to provide the PAN-based solid and porous carbon nanofibers. SEM and diameter analysis were used to measure the morphology and the diameter distribution of the nanofibers. The experiments show that the appropriate PAN spinning concentration is 6 wt%. The diameter of PAN nanofibers is 1242 nm. When the PMMA is added, the diameter of PAN nanofibers decreased to 519 nm with the narrower diameter distribution than that of PAN. Introduce of strain during the oxidation process can effectively maintain the fibrous shape. Carbonization made the diameters of both the PAN and PAN/PMMA nanofibers significantly decrease. The former shows the even diameter of 683 nm and the latter 374 nm. SEM shows that the PAN/PMMA carbon nanofibers have the porous cross-section.

Key words: Polyacry lonitrile, high molecular weight, nanofiber, carbon fiber, electrospinning