在基终结聚丁基固体火箭燃料的热解过程中诱导PAH
Valeriia Karpovych1, Nataliia Haiduk1, Eugene Oga2
1Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, United States.
甲 (AP) 在火箭发动机条件下显著改变基终结聚乙烯 (HTPB) 热解,形成多环芳 (PAHs). 这与之前的假设形成鲜明对比,揭示了对固体燃料燃烧化学的新见解.
科学领域:
- 燃烧化学 燃烧化学是什么
- 聚合物高解热的方法
- 固体火箭推进剂 固体火箭推进剂
背景情况:
- 之前的研究假定甲 (AP) 对基终结聚乙烯 (HTPB) 热解的影响最小.
- 主流观点认为,AP作为一种无特征的氧化剂,仅仅增加了热解温度.
研究的目的:
- 在模拟固体火箭发动机条件下研究AP对HTPB热解化学的影响.
- 识别新型热解产品和阐明形成途径.
- 挑战现有的关于AP在HTPB分解中的作用的假设.
主要方法:
- 利用分子束 (MB) 方法与飞行时间质谱法 (TOFMS) 结合用于高时间分辨率分析.
- 使用热解气色谱-质谱法 (Pyr-GC-MS) 进行详细的产品识别.
- 通过进化气体分析质谱学 (EGA-MS) 证实了这些发现.
主要成果:
- 在HTPB/AP热解过程中检测到高达240-260m/z的多环芳 (PAH),仅在HTPB热解中没有.
- 观察到循环C6产物的形成 (,) 以非循环C6产物的代价.
- 证实PAH形成发生在微秒时间尺度上,产生多达五个环的产品.
结论:
- 与之前的假设相反,甲酸盐积极参与并修改HTPB热解化学物质.
- 氧化和循环C6产物的形成是HTPB/AP燃烧的重要,以前未被识别的方面.
- 这项研究需要重新评估固体火箭推进剂燃烧模型,以结合这些发现.
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