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A reflection non-contact ultrasonic microscope system working both in amplitude and phase difference modes at 2MHz has been developed using an air-coupled concave transducer made of piezoelectric polymer films of poly(vinylidene fluoride/trifluoroethylene) [P(VDF/TrFE)]. The transducer is composed of three 95μm-thick P(VDF/TrFE) films stacked together, each of which is activated electrically in parallel...
In order to obtain the pressure-temperature (P-T) phase diagram of poly(vinylidene fluoride) (PVDF), the melting and crystallization behaviours under high pressure were investigated as a function of temperature and pressure. A corrected P-T phase diagram, in which the triple point (orthorhombic, hexagonal and melt) exists at 320 MPa and 300°C, is proposed. A film mainly consisting of extended-chain...
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