端羟基聚丁二烯(HTPB)高温加速老化机理及构效关系研究
Accelerated Aging Mechanism and Correlation of Hydroxyl-terminated Polybutadiene(HTPB)
赵志星 1霍亮 2陈家兴 2武锐 2王祺 2石森 2李亚军 2曾繁琦 3吕亚栋3
作者信息
- 1. 海军装备部驻西安地区军事代表局,西安 710000
- 2. 内蒙动力机械研究所,呼和浩特 010010
- 3. 四川大学 高分子科学与工程学院,成都 610065
- 折叠
摘要
目的 揭示端羟基聚丁二烯(HTPB)推进剂材料的高温加速老化机理,获得其在微观结构与宏观性能变化之间的关联.方法 系统研究典型HTPB推进剂材料高温老化下的微观结构变化与宏观性能变化,重点探究其在高温加速老化下的分子机理及失效规律研究,并通过建立微观结构与宏观性能的对应关系来推断其性能变化.结果 HTPB 推进剂材料宏观性能随老化时间增加而变化主要是因为其微观结构损伤(基体氧化交联、界面损伤等)造成的,同时其氧化交联反应不仅发生在样品表面,在样品内部也观察到类似反应.进一步研究发现,其力学性能(拉伸强度、断裂应变)与玻璃化转变温度(tg)、α 松弛峰以及凝胶含量有较强相关性.结论 高温加速老化过程中,HTPB推进剂材料内部和表面均会发生氧化,同时出现填料-基体界面损伤,这些微观结构损伤主要造成了其力学性能衰减.
Abstract
The work aims to elucidate the high-temperature accelerated aging research and mechanistic analysis of Hy-droxyl-Terminated Polybutadiene(HTPB)propellant materials,and establish a linkage between microstructural alterations and macroscopic property variations.It systematically examined the microstructural transformations and macroscopic property variations in typical HTPB propellant materials subject to high-temperature aging.The emphasis was placed on investigating the molecular mechanisms and failure modes during accelerated aging,and deducing performance variations through the establish-ment of a correlation between microstructure and macroscopic properties.The findings suggested that the primary cause of macroscopic property variation over time was mainly attributed to microstructural damages,such as oxidation and cross-linking of the matrix as well as the interface damage,with oxidation cross-linking reactions observed not merely on the specimen's sur-face but also internally.Further investigation revealed a significant correlation between mechanical properties—tensile strength,elongation at break—and glass transition temperature(tg),the α-relaxation peak,and gel content.Oxidative damage in both the internal and surface regions of HTPB propellant materials,accompanied by filler-matrix interface damage during the high-temperature accelerated aging process,fundamentally results in the decline of mechanical properties.
关键词
推进剂材料/老化机理/宏观性能/微观结构/构效关系/加速老化评价方法Key words
propellant materials/aging mechanisms/macroscopic property/microstructure/structure-function relationship/accelerated aging evaluation method引用本文复制引用
出版年
2024
NETL
NSTL
万方数据