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Molecular dynamics simulation of diffusion of hydrogen and its isotopic molecule in polystyrene

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Abstract

Polystyrene is one of the target materials used in Inertial Confinement Fusion (ICF). Molecular dynamics simulations are performed in this report to study the diffusion of gases, including hydrogen and its isotopic molecule under normal temperature and pressure. According to the Mean Square Displacement (MSD) of the gas moving in polystyrene, the diffusion coefficient of hydrogen, deuterium and tritium in different molecular weight polystyrene were obtained. The calculated diffusion coefficients agree well with the results of former simulation studies. The diffusion coefficients of polystyrene of the same molecular weight gradually decrease along with the increase of mass fraction of hydrogen isotopes (hydrogen, deuterium and tritium). The study also finds that diffusion coefficients will decrease along with the increasing of polystyrene molecular weight. Moreover, the pair correlation functions, cohesive energy density and fractional free volume were studied corresponding to hydrogen isotopes diffusion coefficients.

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Acknowledgements

Acknowledge University of Science and Technology and China Academy of Engineering Physics institute of Calculations. Acknowledge the individuals who were by our side both professionally and personally during this study.

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Authors and Affiliations

  1. School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, People’s Republic of China

    Yong Yi & Xiaofeng Zhao

  2. Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang, 621010, People’s Republic of China

    Peng Bi

  3. Institute of Computer Application, China Academy of Engineering Physics, Mianyang, 621900, People’s Republic of China

    Lili Wang

Authors
  1. Yong Yi
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  2. Peng Bi
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  3. Xiaofeng Zhao
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  4. Lili Wang
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Correspondence to Peng Bi or Xiaofeng Zhao.

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Yi, Y., Bi, P., Zhao, X. et al. Molecular dynamics simulation of diffusion of hydrogen and its isotopic molecule in polystyrene. J Polym Res 25, 43 (2018). https://doi.org/10.1007/s10965-017-1406-1

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  • DOI: https://doi.org/10.1007/s10965-017-1406-1

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