Temperature dependence of the Gruneisen parameter and estimation of the entropy of polyethylene under strong dynamic compression

This study evaluates the entropy change of polyethylene under strong dynamic compression. It is shown that the entropy jump at the shock front during shock-wave compression is proportional to the relative density change raised to a power of at least three. Using the molecular dynamics method and the LAMMPS software package, the temperature dependence of the Gruneisen parameter for polyethylene was obtained. The resulting dependence indicates that the value of this parameter increases from 3.8 to 4.32 over the temperature range of 0–90 °C.

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