X線パラメターの相互関係と黒鉛化過程

II. ポリ塩化ビニル炭化物の場合

抄録

The coke PV-7, prepared by carbonizing polyvinylchloride to 680°C, was heat-treated at different temperatures and residence times in the flow of nitrogen and under reduced pressure of about 0.02 Torr. On these heat-treated samples, the relations between mean lattice spacing c₀ and crystallite sizes L_c (00l) and between strain along the c-axis ε_c and -c₀ were investigated.The results are summarized as follows,
1) The graphitization process of PV-7 seems to consist of two stages (-c₀>6.85Å and c₀<6.85Å), which were also found in the case of a petroleum coke as reported previously.
2) The apparent crystallite size L_c (00l) of PV-7 is larger than that of the petroleum coke. This difference is explained to come from the difference in the real size of crystallite between them.
3) The relation between ε_c and -c₀ in the second stage of graphitization can be explained by the assumption that two kinds of interlayer spacing, 3.354 and 3.44Å, coexist in a packet of graphite-like layers.