环境温度对复合固体推进剂贮存老化微观损伤作用机制研究

摘要

Objective To study the aging mechanism of HTPB propellant at ambient temperature. Methods High tempera-ture accelerated aging test was carried out in the complex solid propellant laboratory to analyze change rules of chemical func-tional groups and loss factors in different extent of injury and deduce the microscopic damage mechanism at ambient tempera-ture comprehensively. Results At the ambient temperature, oxidizer AP always released active ingredients to attack the main chain of HTPB binder to form a cross-linked polymer and then generate multiple oxides such as peroxide, aldehyde and ester. In the later state of aging, main chain of HTPB binder would be degraded in R—CO—NH or C=C and then the content of R—CO—NH or C=C decreased with the passing of time. Conclusion At the ambient temperature, both cross-linked reaction and degradation reaction of solid propellant occur during the whole process when cross-linked reaction is dominant in the initial stage and degradation reaction plays a leading role in the later stage of aging.%目的 研究复合固体推进剂在环境温度作用下的微观损伤机制.方法 开展复合固体推进剂实验室高温加速老化试验,分析不同损伤程度下的化学官能团和损耗因子的变化规律,综合推断环境温度作用下的微观损伤机制.结果 复合固体推进剂在环境温度作用下,氧化剂AP一直不断地分解释放出活性成分,攻击 HTPB 粘合剂主链,使粘合剂主链初期主要发生交联反应,生成多种氧化产物如过氧化物、醛基、酯基.在老化后期,粘合剂主链开始断链,断链位置应该为R—CO—NH或C=C处,使得R—CO—NH、C=C含量随着老化时间的增加而逐渐降低.结论 在环境温度的作用下,复合固体推进剂同时发生氧化交联和分解断链两种反应,但老化初期氧化交联占主导,老化后期主要发生分解断链.