| 초록 |
The pitches was obtained by thermal treatment at different times of 1, 3, 5, or 10 h at 360 °C or by thermal treatment for 2 h at 360 °C after electron beam irradiation (EBI) treatment. EBI treatment was found to be an effective treatment for preparing pitch, creating a material with properties similar to those of pitch obtained by 10 h thermal treatment. These results were confirmed by Fourier transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance (1H-NMR) analyses through the increase in the intensities of peaks corresponding to aromatic compounds. In the matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) spectra, the amount of components with medium molecular weights in the pitch was found to increase with the increase in the thermal treatment time. In the case of the pitch obtained via EBI treatment, we found that the amount of components with higher molecular weight over 1000 (m/v) similarly increased. The thermal stability and carbon yield at 850 °C were the highest for the pitch obtained via EBI among all tested samples. |
