Now showing items 1-5 of 5
Surface potentials of corona-charged ferroelectric P(VDF-TrFE) copolymer samples
(Ferroelectrics, 1993-01-01) [Artigo]
Surface potential measurements are presented as a function of time for negatively corona charged P(VDF-TrFE) samples in a constant current corona triode kept at low humidity levels. The surface potential curves roughly ...
Thermal treatment effects on phase transitions in P(VDF-TrFE)
(Proceedings - International Symposium on Electrets, 1999-12-01) [Artigo]
Differential scanning calorimetry (DSC) studies were performed for 60/40 P(VDF-TrFE). The results not only confirm the importance of thermal history but also show that the samples with various configurations in terms of ...
Influence of preparation methods and thermal treatment in melt-solidified and cast films of poly(vinylidene fluoride-trifluorethylene) copolymers
(Ferroelectrics Letters Section, 1998-01-01) [Artigo]
This paper is aimed at addressing the differences observed in film properties when poly(vinylidene fluoride-trifluorethylene) P(VDF-TrFE) films are fabricated using distinct methods. Samples were obtained either from casting ...
MEASURING HYSTERESIS LOOPS OF FERROELECTRIC POLYMERS USING THE CONSTANT CHARGING CURRENT CORONA TRIODE
(Review of Scientific Instruments, 1991-07-01) [Artigo]
A novel method is proposed for measuring the hysteresis loops of ferroelectric polymers. The samples need to have only one electrode and are poled by corona discharge in a constant current corona triode. It is shown how ...
On the equivalence of the mechanisms governing switching and hysteresis phenomena
(Proceedings - International Symposium on Electrets, 1992-01-01) [Trabalho apresentado em evento]
The nucleation and growth model, which is usually applied to switching phenomena, is adapted for explaining surface potential measurements on the P(VDF-TrFE) (polyvinylidene fluoride-trifluoroethylene) copolymer obtained ...