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采用固体13 C核磁共振(13 C Solid-NMR)、差示扫描量热分析(DSC)研究了不同温度场对聚丙烯腈纤维预氧过程中类萘啶结构生成的影响。研究结果表明:提高预氧化温度纤维中易于形成类萘啶的梯形含氮芳杂环结构,预氧化热处理温度高于230℃时,类萘啶结构生成速度较快。梯度升温方式影响类萘啶结构的生成,三温区温度场条件下(210-230-245℃),在高温区(245℃)停留时间较长时有利于类萘啶结构的形成和发展;四温区温度场中(210-230-245-260℃),均匀分配各温区的热处理时间更有利于类萘啶结构的生成。
The effects of different temperature fields on the formation of naphthyridine structures during the preoxidation of polyacrylonitrile fibers were investigated by solid state 13 C solid-NMR and differential scanning calorimetry (DSC). The results show that when the pre-oxidation heat treatment temperature is higher than 230 ℃, the formation rate of the naphthyridine-like structure is faster. Gradient temperature-rising mode affected the generation of naphthyridine-like structures. The formation of the class of naphthyridine was favored when the residence time in the high temperature range (245 ℃) was longer than that in the three temperature region (210-230-245 ℃) Four temperature zone temperature field (210-230-245-260 ℃), evenly distributed heat treatment time of each temperature zone is more conducive to the formation of naphthyridine structure.