Piezoelectric Effect in Oriented Polyvinylchloride and Polyvinylflouride

Abstract

The direct piezoelectric effect has been observed in roll-elongated films of polyvinylchloride and polyvinylfluoride. The effect was produced by applying tensile stress to a clamped specimen at a fixed frequency of 20 Hz. The piezoelectric modulus g31 was determined to be 0.2 to 0.7 V m−1/N m−2 in polyvinylchloride; in polyvinylfluoride g31 ≃ 0.2 V m−1/N m−2 and g32 ≃ 1 V m−1/N m−2. The piezoelectric effect in these films is believed to be due to mechanical distortion of oriented dipoles, resulting from the tensile stress, and the orientation appears to differ in the two materials.

Piezoelectric polymer transducer for impact pressure measurement

“…The following recommendations are presented for future work: (1) The effects of spherical curvature imparted to the transducer during impact should be investigated experimentally and theoretically with and without lubrication. The imposition of spherical curvature to a nominally flat transducer results unavoidably in the generation of a membrane stress distribution, which will be specific to each impact.…”

“…This report describes the development of a pressure transducer design utilizing a polymeric piezoelectric element [1]* for sensing impactinterface pressure.…”

Piezoelectric effect in potting resins

“…From these values, the shock force that was imparted to the test specimen was calculated by: (2) where F shock force on test specimen in lbs. W weight of drop weight = 100 grams (.22Ibs.)…”

“…Scialdone calculated and measured spacecraft compartment and equipment outgassing rates (2). He shows that the depressurization time constant, T, which is the time for the pressure to decrease to 36% of its initial pressure, is VIC, where V is the volume in cubic centimeters and the conductance Cis: …”

Shear piezoelectricity of optically active polysuccinimides

“…1). One type is poled polar polymers, such as poly(vinylidene difluoride) (PVDF), [10][11][12] poly(vinyl chloride), 13,14) and odd nylons. 15,16) The piezoelectricity of PVDF was first reported in 1969 by Kawai,10) after which numerous studies have been conducted by many researchers worldwide.…”