X射线光电子能谱在HTPB推进剂老化机理研究中的应用

Application of X-ray Photoelectron Spectroscopy in Investigating Aging Mechanism of HTPB Propellant

采用X射线光电子能谱(XPS)法研究了HTPB推进剂在80℃热空气烘箱内分别老化0周、13周和24周的元素组成、化学价态及含量变化。通过拟合C,O,N,Cl等元素的XPS谱图,推测该推进剂在常温(25℃)贮存老化初期应是氧化交联,后期则出现降解断链,并认为NH4ClO4缓慢分解,攻击C C不饱和双键,使得C C双键含量降低是HTPB推进剂老化失效的主要原因。Al粉被包裹在推进剂粘合剂内部,XPS法未能检出Al粉。由于Al粉比较稳定,不参与推进剂老化过程,故XPS仍可用于HTPB推进剂老化机理研究。

Elementary composition,chemical valence,and content change of HTPB propellant stored in 80 ℃ hot air for 0,13,and 24 weeks were investigated using X-ray photoelectron spectroscopy.It was concluded that HTPB propellant at normal-temperature（25 ℃） storage is oxidation crosslinking in earlier aging stage and degradation in later aging stage via fitting XPS spectrogram of C,O,N and Cl elements;the main reason of HTPB propellant aging failure is that NH4 ClO4 is slowly decomposed to attack unsaturated C C double bond and then results in lower content of C C double bond.