Anomalies of Hypersonic Velocity and Attenuation in Vinylidene Fluoride-Trifluoroethylene Copolymer from Brillouin Scattering

Abstract

The hypersonic behavior of a vinylidene fluoride and trifluoroethylene (70/30 mol %) copolymer has been investigated by Brillouin scattering without using index matching liquid. Both the glass and ferroelectric transitions are clearly seen in the acoustic behavior. The home‐prepared sample has excellent optical properties and let us obtain soundattenuation information in the temperature range of 23–123 °C, which another investigator did not discuss because of the bad optical properties of the sample surface. Anomalies of soundattenuation near the transition point have been observed.