固体火箭技术2025，Vol.48Issue(4)：594-601,8.DOI:10.7673/j.issn.1006-2793.2025.04.011
某NEPE推进剂高温加速老化失效机理研究
Failure mechanism of a NEPE propellant under high-temperature accelerated aging
摘要
Abstract
The high-temperature accelerated aging failure mechanism of nitrate ester plasticized polyether(NEPE)propellant through comprehensive experimental analysis was investigated.A gas collection and detection system was designed,and high-tem-perature accelerated aging tests of NEPE propellant were conducted.The release amounts of nitrogen oxides(NOx)and carbon di-oxide(CO2)were monitored,while the tensile strength and elongation of the NEPE propellant were measured.The consumption of stabilizers(MNA and 2-NDPA)was tracked using high-performance liquid chromatography(HPLC),and the degradation of the binder network structure was characterized by Fourier transform infrared spectroscopy(FTIR).Additionally,a joint aging test of propellant/film was designed.The results showed that NOx and CO2 gases were simultaneously released during the aging process of NEPE propellant,with the release exhibiting a disproportionate increase and continuous growth.The tensile strength significantly decreased after 68 days at 70℃,accompanied by softening,while the elongation abnormally increased.MNA was completely de-pleted at 53 days at 70℃,with a degradation rate significantly faster than that of 2-NDPA.During aging,the amide bonds of the urethane groups in the propellant broke,generating—OH and—NH2 ions,and it was confirmed that the CO2 release originated from the combined effects of nitrate ester decomposition and binder system degradation.The failure mechanism of NEPE propellant under high-temperature aging was revealed:after the stabilizers were depleted,the nitrate esters entered a self-catalyzed rapid de-composition stage,and the acidic environment formed by the decomposition products promoted hydrolysis of the binder,leading to molecular chain scission and gas channel blockage.Ultimately,gas pores were formed within the propellant,causing structural dam-age to the matrix.关键词
NEPE推进剂/安定剂/失效机理/老化降解Key words
NEPE propellant/stabilizer/failure mechanism/aging degradation分类
航空航天引用本文复制引用
韵胜,冯蒙蒙,魏世龙,王升良,傅琳..某NEPE推进剂高温加速老化失效机理研究[J].固体火箭技术,2025,48(4):594-601,8.基金项目
国家级项目. （）
