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Molecular dynamics simulations on the structures and properties of ε-CL-20-based PBXs

Primary theoretical studies on HEDM formulation design

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Abstract

Five polymer bonded explosives (PBXs) with the base explosive ε-CL-20 (hexanitrohexaazaisowurtzitane), the most important high energy density compound (HEDC), and five polymer binders (Estane 5703, GAP, HTPB, PEG, and F2314) were constructed. Molecular dynamics (MD) method was employed to investigate their binding energies (E bind), compatibility, safety, mechanical properties, and energetic properties. The information and rules were reported for choosing better binders and guiding formulation design of high energy density material (HEDM). According to the calculated binding energies, the ordering of compatibility and stability of the five PBXs was predicted as ε-CL-20/PEG > ε-CL-20/Estane5703 ≈ ε-CL-20/GAP > ε-CL-20/HTPB > ε-CL-20/F2314. By pair correlation function g(r) analyses, hydrogen bonds and vdw are found to be the main interactions between the two components. The elasticity and isotropy of PBXs based ε-CL-20 can be obviously improved more than pure ε-CL-20 crystal. It is not by changing the molecular structures of ε-CL-20 for each binder to affect the sensitivity. The safety and energetic properties of these PBXs are mainly influenced by the thermal capability (C°p) and density (ρ) of binders, respectively.

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Authors and Affiliations

  1. Department of Chemistry, Nanjing University of Science and Technology, Nanjing, 210094, China

    Xu XiaoJuan, Xiao JiJun & Xiao HeMing

  2. Department of Chemistry, Yancheng Teacher’s College, Yancheng, 224002, China

    Xu XiaoJuan

  3. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China

    Huang Hui & Li JinShan

Authors
  1. Xu XiaoJuan
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  2. Xiao JiJun
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  3. Huang Hui
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  4. Li JinShan
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  5. Xiao HeMing
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Correspondence to Xiao HeMing.

Additional information

Supported by the National Natural Science Foundation of China (Grant No. 10176012), the Important Foundation of China Academy of Engineering Physics (CAEP, 2004Z0503) and 973 Program of China

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Xu, X., Xiao, J., Huang, H. et al. Molecular dynamics simulations on the structures and properties of ε-CL-20-based PBXs. Sci. China Ser. B-Chem. 50, 737–745 (2007). https://doi.org/10.1007/s11426-007-0141-6

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  • DOI: https://doi.org/10.1007/s11426-007-0141-6

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