| 초록 |
In the reforming process of pitch from PFO, various reactions occur such as distillation, cracking reaction, polymerization, and condensation. In order to investigate the structural change of PFO accompanied with those various reactions, we prepared pitches and collected the volatile matters from PFO with different heat treatment temperature. They were evaluated by 1H-NMR based structural analysis. The amount of 1-2 ring aromatic compounds contained in PFO were gradually decreased as the heat treatment temperature increased up to 340 °C. At temperatures above 320 °C, the peaks for aliphatic hydrocarbon diminished with increasing temperature since aliphatic hydrocarbon sidechain were separated from aromatic compounds by the cracking reaction. As a result, the structural change of PFO with the heat treatment is mostly affected by distillation effect up to 340 °C, and then separation of aliphatic sidechain accompanied with cracking reaction occurs at the temperature above 320 °C. |
