氧对PAN分子侧氰基反应进程的影响  

Effect of oxygen on reaction of side nitrile group in PAN molecules

作　　者：龚勇明[1] 徐樑华[1] 刘淑金[1] 赵振文[1] 张晓巍[1] 金娟[1] 

机构地区：[1]北京化工大学碳纤维及复合材料研究所,北京100029

出　　处：《合成纤维工业》2005年第2期10-12,共3页China Synthetic Fiber Industry

基　　金：国家自然科学基金重点项目(5033060)

摘　　要：采用固体13C-CP／MAS,FT-IR和DSC方法分析自制二元共聚PAN纤维在不同气氛下的热稳定化 行为,研究氧对PAN分子侧氰基反应的影响。结果表明:在无氧气氛下处理时,PAN分子先发生环化反应; 而在有氧气氛下,先发生脱氢反应,再发生环化、氧化反应,氧化反应中氧与PAN分子链结合生成C=O, HC-OH等官能团,氧可以促进环化、脱氢反应的发生,PAN链状分子结构逐渐演变为耐热的含氧梯型聚合 物结构。The thermostabilization of self-made binary polyacrylonitrile fiber was analyzed in different atmosphere by solid-state C-CP/MAS, FT-IR and DSC. The effect of oxygen on the reaction of side nitrile group was studied. The results showed that the cyclization of PAN molecules occurred firstly in absence of oxygen; the dehydrogenation occurred before cyclization and oxidation in presence of oxygen. Oxygen reacted with PAN molecular chain and offered C=O and HC-OH functional group in oxidation, which indicated that oxygen can initiate cyclization and dehydrogenation. The chain structure of PAN molecules converted to heatresistant oxygen-containing ladder structure.

关 键 词：反应进程 氰基 CP/MAS 脱氢反应 氧化反应 PAN纤维 DSC方法 FT-IR 聚合物结构 热稳定化 二元共聚 环化反应 分子结构 氧气氛 官能团 含氧 链状 

分 类 号：TQ342.31[化学工程—化纤工业]