Etude d'Homopolymeres et de Copolymeres Piezoelectriques et Pyroelectriques (Study of Piezoelectric and Pyroelectric Homopolymers and Copolymers). Untersuchung von Piezoelektrischen und Pyroelektrischen Homopolymeren und Kopolymeren

摘要

The report concerns the piezoelectric and ferroelectric properties of polymers and copolymers of polyfluorovinylidene. The homogeneity of polarization in the organic ferroelectric materials is examined with the help of the Pressure-Wave Propagation method. The homogeneity is excellent in the total thickness of samples studied. The use of polymer piezoelectric gages is described for measuring the stresses induced in the base of a 25-mm projectile at the moment of firing. Results are presented showing that reproducible film gages for impact pressure, functioning over 0-200 kbar, can be made. Studies at Sandia Labs on ISL sensors are presented. The initial examples of isentropic compression and of profiles of detonation waves are reported. In addition, experiments on measuring impact pressures induced by detonators are presented (pressures between 60 and 210 kbar). Finally are presented the first trials of dynamic accelerometry at a high level, where the piezoelectric PVDF functions actively at over 150,000 g. Such accelerometers are of particular interest in the field of 'intelligent' munitions.