Abstract
Polydimethylsiloxane (PDMS) is a common silicone polymer. Understanding its decomposition product distribution is required for calculating its equation of state under shock conditions. We have detonated small samples of HMX explosive in contact with the polymer in a high vacuum chamber and used a time‐of‐flight mass spectrometer to analyze the chemical products of PDMS decomposition. We have used the computer code CTH to model the time history of pressure and temperature in the sample. The time scale of a few nanoseconds in these experiments generates products that are significantly different than the equilibrium products observed in thermal pyrolysis experiments. The mass spectrum under shock conditions predominately shows monomers to heptamers of dimethylsiloxane, and the n‐mers minus methyl groups. We have compared spectra of high molecular weight liquid PDMS, crosslinked solid PDMS, and silica filled solid PDMS.
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