Structure and Property of Electrospun PAN Nanofibers by Different Pre-oxidated Heating Rates

摘要

Electrospinning is a relatively simple method to produce submicron fibers from solutions of different polymers and polymer blends. In this study, PAN (polyacrylonitrile) fibers web was fabricated by electrospinning, and then was pre-oxidated. Effects of pre-oxidated heating rate on the structure and property of pre-oxidation web were discussed in this article. Thermal gravimetric (TG) curves were used to compare the thermal stability of PAN pre-oxidated samples under different pre-oxidated heating rates. TG curves showed that the integral procedural decomposition temperature was the highest when the pre-oxidated heating rate was 5℃/minute, that is, the thermal stability of pre-oxidated nanofibrou web was the best under this condition. Moreover, results showed that with pre-oxidated heating rate increasing, the rate of mass loss gradually increased by moisture content analysis. Effect of the heating rate on central degree of the pre-oxidated web was not obvious by differential scanning calorimetry analysis, and the cyclization and dehydrogena-tion formed the final structure of the aromatic by infrared spectroscopy analysis. Especially, carbon nanofibers could be obtained from the pre-oxidated nanofibers at pre-oxidated heating rate 5℃/minute with smooth surface and small fiber dispersion as well as solid and no empty fiber structure of the section.