| Abstract
| - Oxydianiline-pyromellitic dianhydride poly(amic acid) (ODA-PMDA PAA) was polymerized with a catalystsupport of triethyl amine for controlling molecular weight. This polymer was used for electrospinning in thepreparation of PAA nanofibers, a precursor of carbon nanofibers. Here the amount of catalyst and concentrationof PAA solution were optimized to produce polyimide-based carbon nanofibers approximately 80 nm indiameter. The effects of molecular weight of PAA, bias voltage, and spinning rate on the morphology ofelectrospun PAA and polyimide nanofibers have been evaluated. We showed that the conductivity of thecarbon nanofiber mat decreased with increasing nanofiber diameter, where the conductivity of polyimide-based carbon nanofiber mat was much higher than those of other types of carbon nanofiber mat. The keyingredient to increase conductivity in a carbon nanofiber mat was found to be the number of cross junctionsbetween nanofibers.
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