メソフェーズピッチ紡糸繊維の不融化反応

抄録

Mesophase petroleum pitch fiber was oxidized by two kinds of mixed gases of O₂ and N₂ and oxygen consumption rates were measured under several isothermal conditions between 160°C and 240°C. Oxidized pitch fiber obtained was carbonized to evaluate its infusibility and also analyzed to examine its elemental composition and structure change during the reaction by using several instrumental analytical method such as elemental analysis, electron spectroscopy for chemical analysis and fourier transform infrared analysis.
It was found that 4/3 mole of oxygen atom is fixed in the fiber and 2/3 mole of water is released during the consumption of one mole of oxygen gas. Both of total amount of oxygen consumed and elemental compositions of carbon, hydrogen and oxygen were found to be constant at completion of the stabilization reaction under any experimental condition conducted.
It can be concluded that concentration of the fixed oxygen in the surface layer of the fiber is different from that in the inner region. It can also be assumed that the active site in the molecules that constitute pitch fiber is aliphatic chain and that oxidation reaction proceed with forming of carbonyl group.