The effects of the type of storage atmosphere used on the spontaneous ignition of cellulose nitrate (NC) were investigated. Nitrogen dioxide, nitric oxide, oxygen, nitrogen, and dried air were used as storage atmospheres. Exothermic degradation was observed to be acceleratd in oxygen. In contrast, no degradation was observed with nitrogen. These results indicate that exothermic degradation by oxygen is related to spontaneous ignition. In addition, when low concentrations of nitrogen dioxide were used, there was no exothermic degradation. These results suggest that nitrogen dioxide contributes little to the generation of heat.
ニトロセルロースの自然発火に及ぼす貯蔵雰囲気(二酸化窒素, 一酸化窒素, 酸素, 窒素, 空気)の影響をFT-IRスペクトル及びC-80による熱分析により追跡した｡ その結果, 窒素雰囲気と比較して, 酸素及び乾燥空気雰囲気中で劣化は促進した｡ したがって, NCの自然発火は, 酸素が大きく寄与するものと考えられる｡ 大過剰な二酸化窒素雰囲気中では, NCの劣化は, 促進するが比較的低濃度(4.5%)の場合は, 酸素及び乾燥空気雰囲気中よりも劣化は, 抑制され, 実際の貯蔵雰囲気における分解初期の段階では, 酸素の寄与が大きいものと考えられる。