Abstract
We present structure and equation of state (EOS) measurements of biaxially orientated polyethylene
terephthalate (PET, (C10H8O4)n, also called mylar) shock-compressed to (155 ± 20) GPa and
(6000 ± 1000) K using in situ X-ray difraction, Doppler velocimetry, and optical pyrometry. Comparing
to density functional theory molecular dynamics (DFT-MD) simulations, we fnd a highly correlated
liquid at conditions difering from predictions by some equations of state tables, which underlines
the infuence of complex chemical interactions in this regime. EOS calculations from ab initio DFT-MD
simulations and shock Hugoniot measurements of density, pressure and temperature confrm the
discrepancy to these tables and present an experimentally benchmarked correction to the description
of PET as an exemplary material to represent the mixture of light elements at planetary interior
conditions
terephthalate (PET, (C10H8O4)n, also called mylar) shock-compressed to (155 ± 20) GPa and
(6000 ± 1000) K using in situ X-ray difraction, Doppler velocimetry, and optical pyrometry. Comparing
to density functional theory molecular dynamics (DFT-MD) simulations, we fnd a highly correlated
liquid at conditions difering from predictions by some equations of state tables, which underlines
the infuence of complex chemical interactions in this regime. EOS calculations from ab initio DFT-MD
simulations and shock Hugoniot measurements of density, pressure and temperature confrm the
discrepancy to these tables and present an experimentally benchmarked correction to the description
of PET as an exemplary material to represent the mixture of light elements at planetary interior
conditions
| Original language | English |
|---|---|
| Article number | 12883 |
| Number of pages | 9 |
| Journal | Scientific Reports |
| Volume | 11 |
| Early online date | 18 Jun 2021 |
| DOIs | |
| Publication status | Published - Dec 2021 |