高压下<em>β</em>-HMX热分解机理的ReaxFF反应分子动力学模拟

引用本文: 周婷婷, 石一丁, 黄风雷. 高压下β-HMX热分解机理的ReaxFF反应分子动力学模拟[J]. 物理化学学报, doi: 10.3866/PKU.WHXB201208031 shu

Citation: ZHOU Ting-Ting, SHI Yi-Ding, HUANG Feng-Lei. Thermal Decomposition Mechanism of β-HMX under High Pressures via ReaxFF Reactive Molecular Dynamics Simulations[J]. Acta Physico-Chimica Sinica, doi: 10.3866/PKU.WHXB201208031 shu

高压下β-HMX热分解机理的ReaxFF反应分子动力学模拟

基金项目:
国家自然科学基金(10832003)资助项目 (10832003)

摘要:

采用ReaxFF反应分子动力学方法研究了不同压缩态β-HMX晶体(ρ=1.89、2.11、2.22、2.46、2.80、3.20 g·cm^-3)在T=2500 K时的热分解机理, 分析了压力对初级和次级化学反应速率的影响、高压与低压下初始分解机理的区别以及造成反应机理发生变化的原因. 发现HMX的初始分解机理与压力(或密度)相关. 低压下(ρ<2.80 g·cm^-3)以分子内反应为主, 即N－NO₂键的断裂、HONO的生成以及分子主环的断裂(C－N键的断裂). 高压下(ρ≥2.80 g·cm^-3)分子内反应被显著地抑制, 而分子间反应得到促进, 生成了较多的O₂、HO等小分子和大分子团簇. 初始分解机理随压力的变化导致不同密度下的反应速率和势能也有所不同. 本文在原子水平对高压下HMX反应机理的深入研究对于认识含能材料在极端条件下的起爆、化学反应的发展以及爆轰等具有重要意义.

关键词:

HMX
/ 热分解
/ 压力
/ ReaxFF
/ 分子动力学

English

Thermal Decomposition Mechanism of β-HMX under High Pressures via ReaxFF Reactive Molecular Dynamics Simulations

1.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, P. R. China
Received Date: 04 June 2012
Available Online: 17 October 2012
Fund Project:
国家自然科学基金(10832003)资助项目

Abstract:

The thermal decomposition mechanisms of condensed phase β-HMX at various densities (ρ= 1.89, 2.11, 2.22, 2.46, 2.80, 3.20 g·cm^-3) and at 2500 K were studied using ReaxFF reactive molecular dynamics simulations. The effects of pressure on the initial and secondary reaction rates, the main differences in the initial decomposition mechanisms between highly compressed and less compressed systems, as well as the reasons for these variations were analyzed. It was determined that the initial decomposition mechanisms of HMX were dependent on pressure (or density). At low densities (ρ<2.80 g· cm^-3), intramolecular reactions are dominant, these being N－NO₂ bond dissociation, HONO elimination, and concerted ring fission by C－N bond scission. At high densities (ρ ≥2.80 g·cm^-3), intramolecular reactions are well restrained, whereas intermolecular reactions are promoted, leading to the formation of small molecules, such as O₂ and HO, and large molecular clusters. These changes in the initial decomposition mechanisms lead to different kinetic and energetic behaviors, as well as variations in the distribution of products. These results obtained through this work are significant in that they assist in understanding the chemical reactions involved in the initiation, reaction development, and detonation of energetic materials under extreme conditions.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

高压下β-HMX热分解机理的ReaxFF反应分子动力学模拟

English

Thermal Decomposition Mechanism of β-HMX under High Pressures via ReaxFF Reactive Molecular Dynamics Simulations

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

高压下β-HMX热分解机理的ReaxFF反应分子动力学模拟

English

Thermal Decomposition Mechanism of β-HMX under High Pressures via ReaxFF Reactive Molecular Dynamics Simulations

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

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