In situ Raman spectroscopic studies of polyvinyl toluene under laser‐driven shock compression and comparison with hydrostatic experiments

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EarlyView Article

  • Published: Jul 27, 2017
  • Author: Vinay Rastogi, S. Chaurasia, Usha Rao, C. D. Sijoy, H. K. Poswal, V. Mishra, Manmohan Kumar, M. N. Deo
  • Journal: Journal of Raman Spectroscopy

Shock wave‐induced changes in intra‐molecular vibrations of polyvinyl toluene (PVT) in a confined geometry target assembly are studied over the pressure range of 0–2.25 GPa. A comparative study of the behavior of PVT in the dynamic and quasi‐hydrostatic compression is performed. A 1D radiation hydrodynamic simulation has been performed to calculate the equation of state of the PVT. In present study, the fundamental modes, ν12 mode at 1001 cm−1, ν18a mode at 1031 cm−1 and ν8a mode at 1602 cm−1, of PVT are extensively analyzed. At a pressure of 1.58 GPa, peak shift of 4.24, 5.16 and 6.41 cm−1 for the modes 1001, 1031 and 1602 cm−1, respectively, are observed and are in good agreement with the hydrostatic measurement. Grüneisen parameters are calculated for each modes, which indicates that the primarily volume changes (below 1 GPa) are due to free volume and compression of the inter‐chain bonds, and not because of changes in intermolecular bond lengths. The shock velocity in the sample at pressure 2.25 GPa is calculated as 3.6 ±0.46 km/s by measuring the ratios of the experimental shocked volume to total volume of the sample measured in the time‐resolved measurement and is in good agreement with the simulation result. A comparative study of shock pressure on PVT and polystyrene molecules is also done. These materials are of great interest as they are widely being used as a host material in scintillator detectors, which are used for the measurement of high‐frequency electromagnetic radiation. Copyright © 2017 John Wiley & Sons, Ltd.

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