交联密度为特征参量的NEPE推进剂贮存寿命评估方法研究  

Research on storage life evaluation method of NEPE propellant using crosslink density as the characteristic parameter

作　　者：祝艳龙 丁黎[1] 安静[1] 杜姣姣[1] 周静[1] ZHU Yanlong;DING Li;AN Jing;DU Jiaojiao;ZHOU Jing(Xi'an Modern Chemistry Research Institute,Xi'an 710065,China)

机构地区：[1]西安近代化学研究所,西安710065

出　　处：《固体火箭技术》2022年第1期92-96,共5页Journal of Solid Rocket Technology

摘　　要：为探索新的特征参量来预估NEPE推进剂的贮存寿命,采用高温加速老化方法,通过老化样品性能测试,检测老化过程中爆热、力学性能、燃速、有效安定剂含量、热爆炸临界温度、交联密度等参量的变化,并利用Bethelot方程评估NEPE推进剂的贮存寿命。结果表明,NEPE推进剂在高温加速老化过程中爆热、燃速、热爆炸临界温度及有效安定剂含量随老化时间未出现显著变化,最大抗拉强度、交联密度随老化时间显著降低且具有规律性,表明力学性能、交联密度的下降是推进剂的主要失效模式,即力学性能和交联密度可作为特征参量;以交联密度性能下降至85%作为失效终点,评估NEPE推进剂在30℃下的贮存寿命为18.5 a,两种不同特征参量对NEPE推进剂贮存寿命的评估结果基本一致,可为NEPE推进剂贮存寿命研究提供指导。In order to explore new characteristic parameters to predict the storage life of NEPE propellant,the high-temperature accelerated aging tests were carried out.The parameters such as explosion heat,mechanical properties,burning rate,effective stabilizer content,critical temperature of thermal explosion,crosslink density were detected during the aging process through a series of performance tests of aging samples.Simultaneously the Bethelot equation was used to estimate the storage life of NEPE propellant.The results show that no significant changes with the aging time can be observed for the explosion heat,burning rate,critical temperature of thermal explosion,and effective stabilizer content of NEPE propellant during the high-temperature accelerated aging process.The maximum tensile strength and crosslink density decrease significantly and have regularity during the aging process,which indicates that the decrease of mechanical properties and crosslinking density are the main failure mode of propellant,that is,mechanical properties and crosslink density can be used as characteristic parameters.The estimated storage life of NEPE propellant at 30℃is 18.5 years with the crosslink density performance reduced to 85%as the failure endpoint.The evaluation results of the storage life of NEPE propellant with two different characteristic parameters are the same basically,which provides guidance for the storage life research of NEPE propellants.

关 键 词：NEPE推进剂 加速老化 贮存寿命 交联密度 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]