聚丙烯腈
聚合物
低聚物
热分解
化学
高分子化学
降级(电信)
傅里叶变换红外光谱
氨
残留物(化学)
红外光谱学
热解
逸出气体分析
化学工程
材料科学
热分析
有机化学
热的
气象学
工程类
物理
电信
计算机科学
作者
Thomas J. Xue,Michael A. McKinney,Charles A. Wilkie
标识
DOI:10.1016/s0141-3910(97)00048-7
摘要
The volatile products that are evolved during the thermolysis of polyacrylonitrile have been studied by TGA/FTIR techniques. The complementary solid products that are not volatile have also been isolated and characterized, by means of elemental analysis and infra-red spectroscopy. Cyclization of the polymer proceeds before any mass is lost and the driving force for cyclization is the formation of aromatic rings. The extent of cyclization is controlled by the presence of head-to-head linkages within the polymer. Ammonia and hydrogen cyanide are the first gases lost and schemes are proposed to account for their formation. Oligomers are lost from the uncyclized portion of the polymer lying between the cyclized portions and the amount of non-volatile fraction is largely determined by the extent of oligomer loss. A detailed mechanism is presented to account for the observed formation of the volatile products and the structural changes that occur in the residue.
科研通智能强力驱动
Strongly Powered by AbleSci AI