Ultrafast Shock-Induced Reactions in Pentaerythritol Thin Films

被引:8
|
作者
Park, Samuel D. [1 ,4 ]
Armstrong, Michael R. [2 ]
Kohl, Ian T. [1 ]
Zaug, Joseph M. [2 ]
Knepper, Robert [1 ]
Tappan, Alexander S. [1 ]
Bastea, Sorin [2 ]
Kay, Jeffrey J. [3 ]
机构
[1] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA
[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[3] Sandia Natl Labs, Livermore, CA 94550 USA
[4] US Naval Res Lab, Washington, DC 20375 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY A | 2018年 / 122卷 / 41期
关键词
TETRANITRATE SINGLE-CRYSTALS; CHEMICAL-REACTIONS; SOLID EXPLOSIVES; INITIATION; DETONATION; CHEMISTRY; DECOMPOSITION; SPECTROSCOPY; COMPRESSION; ORIENTATION;
D O I
10.1021/acs.jpca.8b05387
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The chemical and physical processes involved in the shock-to-detonation transition of energetic solids are not fully understood due to difficulties in probing the fast dynamics involved in initiation. Here, we employ shock interferometry experiments with sub-20-ps time resolution to study highly textured (110) pentaerythritol tetranitrate (PETN) thin films during the early stages of shock compression using ultrafast laser driven shock wave methods. We observe evidence of rapid exothermic chemical reactions in the PETN thin films for interface particle velocities above similar to 1.05 km/s as indicated by shock velocities and pressures well above the unreacted Hugoniot. The time scale of our experiment suggests that exothermic reactions begin less than 50 ps behind the shock front for these high-density PETN thin films. Thermochemical calculations for partially reacted Hugoniots also support this interpretation. The experimentally observed time scale of reactivity could be used to narrow possible initiation mechanisms.
引用
收藏
页码:8101 / 8106
页数:6
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