Transient Bond Scission of Polytetrafluoroethylene under Laser-Induced Shock Compression Studied by Nanosecond Time-Resolved Raman Spectroscopy

Nakamura, Kazutaka G.; Wakabayashi, Kunihiko; Kondo, Ken-ichi
June 2002
AIP Conference Proceedings;2002, Vol. 620 Issue 1, p1259
Academic Journal
Nanosecond time-resolved Raman spectroscopy has been performed to study polymer films, polytetrafluoroethylene (PTFE), under laser driven shock compression at laser power density of 4.0 GW/cm². The CF[sub 2] stretching mode line of PTFE showed a higher shift (18 cm[sup -1]) at delay time of 9.3 ns due to the shock compression and corresponding pressure was estimated to be approximately 2.3 GPa. A new vibrational line at 1900 cm[sup -1] appeared only under shock compression and was assigned to the C=C stretching in transient species such as a monomer (C[sub 2]F[sub 4]) produced by the shock-induced bond scission. Intensity of the new line increased with increasing delay time along propagation of the shock compression.


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