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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >Influence of polydopamine coating on the thermal stability of 2,6-diamino-3,5-dinitropyrazine-1-oxide explosive under different heating conditions
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Influence of polydopamine coating on the thermal stability of 2,6-diamino-3,5-dinitropyrazine-1-oxide explosive under different heating conditions

机译：聚二胺涂层对不同加热条件下2,6-二氨基-3,5-二硝基吡吡吡吡吡嗪-1-氧化物爆炸物的热稳定性的影响

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摘要

Polydopamine (PDA) surface coating is an effective way to improve the performance of energetic materials at present. In this study, after coating the surface of insensitive explosive 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105) with PDA, the resulted LLM-105@PDA particles were subjected to in-depth characterizations and a compact core-shell formation with a dense graphite-like structure PDA on LLM-105 crystal was confirmed. The influence of PDA coating on the thermal stability of LLM-105 was studied under three typical heating conditions: programmed, constant-temperature, and adiabatic. Our results demonstrated that the PDA can hardly affect the thermal stability of LLM-105 under non-adiabatic conditions but remarkably intensified under adiabatic conditions. The amount of heat released by PDA decomposition and the heat-exchange rate between sample and environment are the key to this effect, which was confirmed by the Comsol numerical simulation. This work provides a novel perspective for evaluating the thermal stability of mixed explosives containing the functional additive with lower decomposition temperature.
机译：聚二胺（PDA）表面涂层是提高当前能量材料性能的有效途径。在本研究中，用PDA涂覆不敏感炸药2,6-二氨基-3,5-二硝基吡嗪-1-氧化物（LLM-105）的表面后，将得到的LLM-105 @ PDA颗粒进行深入表征和确认了LLM-105晶体上具有致密石墨的结构PDA的紧凑型核 - 壳形成。在三种典型的加热条件下研究了PDA涂层对LLM-105热稳定性的影响：编程，恒温和绝热。我们的结果表明，PDA在非绝热条件下，PDA几乎不能影响LLM-105的热稳定性，但在绝热条件下显着加剧。通过PDA分解释放的热量和样品和环境之间的热交换率是这种效果的关键，通过COMSOL数值模拟确认。该工作提供了一种用于评估含有较低分解温度的混合炸药的热稳定性的新型视角。

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