Shock Induced Reaction Observed via Ultrafast Infrared Absorption in Poly(vinyl nitrate)Films

S.D.McGrane; D.S.Moore; D.J.Funk

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Shock Induced Reaction Observed via Ultrafast Infrared Absorption in Poly(vinyl nitrate)Films

机译：聚乙烯醇薄膜中通过超快红外吸收观察到的震动诱导反应

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Ultrafast laser shock generation methods and broad-band infrared reflection absorption spectroscopy have provided evidence that shock-induced chemistry in a condensed-phase energetic material occurs on a time scale of tens of picoseconds and involves the nitro group as a primary reactant.Femtosecond broad-band infrared reflection absorption spectroscopy was used to monitor films of the energetic polymer poly(vinyl nitrate)during shock loading and rarefaction.At approx 18 GPa,poly(vinyl nitrate)films exhibited loss of absorption in the nitro group stretch modes that did not recover upon rarefaction,providing an indication of initial chemical reaction.At pressures<=9 GPa,the observed spectral changes are ascribed to thin film optical interference effects,without chemical reaction.The loss of infrared absorption required an induction time of tens of picoseconds after shock passage,supporting reaction mechanisms that require vibrational energy transfer rather than prompt reaction.

机译：超快激光震荡产生方法和宽带红外反射吸收光谱法提供了证据，证明凝聚相高能材料中的震荡化学反应发生在数十皮秒的时间范围内，并以硝基为主要反应物。波段红外反射吸收光谱法用于监测高能聚合物聚硝酸乙烯酯在冲击载荷和稀疏化过程中的薄膜。在约18 GPa时，聚硝酸乙烯酯薄膜在硝基拉伸模式下显示出吸收损失，但未恢复在稀疏条件下，提供了初始化学反应的指示。在压力<= 9 GPa时，观察到的光谱变化归因于薄膜光学干涉效应，而没有化学反应。红外吸收的损失需要电击后数十皮秒的感应时间通过，支持需要振动能量转移而不是迅速反应的反应机理。

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2004年第43期|共6页
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S.D.McGrane; D.S.Moore; D.J.Funk;
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Shock Induced Reaction Observed via Ultrafast Infrared Absorption in Poly(vinyl nitrate)Films

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