Abstract
Abstract Stress-strain behavior in tension and compression, Pressure-Volume-Temperature (PVT) relations, and the pressure dependency of transitional behavior, by dielectric technique, of Phase I and Phase II ploy(vinylidene fluoride) (PVDF) have been determined. The result obtained are used in analyzing the complex behavior of piezoelectric and pyroelectric properties of the material at high pressures and temperatures. The Young's modulus(E) of Phase II PVDF increases, at room temperature, monotonically but nonlinearly, with increasing pressure as long as the amorphous material is in the rubbery state. It then takes a step-jump at Pg (5 Kbars) and continues to increase with pressure. However, the yield strength in both tension and compression is observed to be linear functions of pressure. PVT measurements clearly show the glass transion temperature (Tg) at −50°C and the crystal transition (Tc) at 22°C at atmospheric pressure. The Tg of both unoriented and oriented Phase I PVDF increase, in most part, lin...
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