基于红外光谱的HTPB推进剂老化机理

In order to study the aging characteristic mechanism of HTPB propellant from the perspective of infrared spectrum,the accelerated aging test of HTPB propellant at 70 ℃ was carried out,moreover the maximum elongation and infrared absorption spectrum were measured at 15 different aging time.By analyzing the relevance between the changes of absorption spectrum and the maximum elongation of the samples, infrared characteristic wave number closely related to elongation and its corresponding characteristic functional groups -OH,〖JG(〗C〖ZJLX,Y〗O,〖JG)〗and NH₄ ⁺were found,moreover both characteristic absorption peak intensity and maximum elongation present a general downward tendency.The results show that during accelerated aging process, the main aging mechanism of HTPB propellant samples is post-curing reaction consuming -OH,〖JG(〗C〖ZJLX,Y〗O,〖JG)〗and oxidative crosslinking reaction resulting in reduction of NH₄ ⁺ content. At the same time,thess results are consistent with those obtained from traditional methods,which indicates that infrared spectroscopy will become a tool quantitatively reflects aging properties of HTPB propellant.