Dynamics of polarization growth and polarization reversal in PVDF films

Womes, M.; Bihler, E.; Eisenmenger, Wolfgang

doi:10.1109/ise.1988.38580

Cited by 10 publications

(11 citation statements)

References 4 publications

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“…The conduction related displacement D, only becomes sizable at longer poling times and its influence on the formation of the ferroelectric polarization is rather minor. As already shown in earlier publications [9] a temporal delay between the buildup of the total displacement Dk ( T~) and the respective AP, is observed. The results indicate that in case of short poling times the time lag can be explained by two components: first by Dcap which is the displacement due to a permittivity of 11.5 for all poling times, and second by P,, a time dependent polarization whose nature is presently not known.…”

Section: Resultssupporting

confidence: 81%

“…The basic idea of the model is the following: During the application of an electric field all possible polarization orients immediately [20] including the remanent polarization P, which is, however, assumed to be not remanent at this point in time [9,20]. This polarization is only kept oriented by the applied electric field.…”

Section: Discussionmentioning

confidence: 99%

“…This polarization is only kept oriented by the applied electric field. In order to generate real remanent polarization it is postulated that electric charges have to be injected into the sample [9,20] or be generated inside the sample [15] and subsequently trapped at the boundaries of the remanent polarization zones. This trapped charge is then responsible for the stabilization of the formerly unstable 'remanent' polarization.…”

Section: Discussionmentioning

confidence: 99%

“…[2] have pointed out that the displacement fraction related to the linear dielectric response is of minor importance for the derivation of the formulas above. It was Womes et al [9] who discovered a temporal delay between the development of the displacement and the remanent polarization in PVDF and PVDF related copolymers for short poling times [9,10]. Following the results of Sussner and Dransfeld [ll] the group of Eisenmenger put forward a model in which space charge is assumed to be essential for the formation of stable ferroelectric polarization [12,13].…”

Section: Introductionmentioning

confidence: 99%

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A novel displacement component in PVDF and its role in ferroelectric switching

Seggern

Fedosov²

2000

IEEE Trans. Dielect. Electr. Insul.

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In this paper we describe the detection of a novel frequency dependent displacement current in polyvinylidenefluoride (PVDF). This component was derived from electrical switching experiments performed by the application of voltage pulses of different duration, followed by defined short circuit times. By means of the results so obtained, a complete account of all relevant displacement contributions could be derived. It was possible to separate the remanent polarization, the e-related displacements and the conduction currents. It was found that the €-related displacement contains a frequency dependent component which to our knowledge has not been discussed in the literature. By means of this component it is possible to explain the previously observed temporal lag of the remanent polarization and the total displacement which led to the charge trapping model proposed by Eisenmenger and coworkers.

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Section: Resultssupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel displacement component in PVDF and its role in ferroelectric switching

Seggern

Fedosov²

2000

IEEE Trans. Dielect. Electr. Insul.

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“…It was reported that electrically aligned β dipoles in the PVDF film will not relax until the temperature reached above 80 °C. [31][32] The degree of β crystalline dipole alignment in the electrically poled film is compared to a corona-poled film, as shown in the inset of Figure 1B. The corona poling was performed at room temperature with a needle voltage of 20 kV and a grid voltage of 5 kV for 5 min.…”

Section: Resultsmentioning

confidence: 99%

Semicrystalline Structure–Dielectric Property Relationship and Electrical Conduction in a Biaxially Oriented Poly(vinylidene fluoride) Film under High Electric Fields and High Temperatures

Yang

Allahyarov

et al. 2015

ACS Appl. Mater. Interfaces

124

112

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Poly(vinylidene fluoride) (PVDF)-based homopolymers and copolymers are attractive for a broad range of electroactive applications because of their high dielectric constants. Especially, biaxially oriented PVDF (BOPVDF) films exhibit a DC breakdown strength as high as that for biaxially oriented polypropylene films. In this work, we revealed the molecular origin of the high dielectric constant via study of a commercial BOPVDF film. By determination of the dielectric constant for the amorphous phase in BOPVDF, a high value of ca. 21-22 at 25 °C was obtained, and a three-phase (i.e., lamellar crystal/oriented interphase/amorphous region) semicrystalline model was proposed to explain this result. Meanwhile, electronic conduction mechanisms in BOPVDF under high electric fields and elevated temperatures were investigated by thermally stimulated depolarization current (TSDC) spectroscopy and leakage current studies. Space charge injection from metal electrodes was identified as a major factor for electronic conduction when BOPVDF was poled above 75 °C and 20 MV/m. In addition, when silver or aluminum were used as electrodes, new ions were generated from electrochemical reactions under high fields. Due to the electrochemical reactions between PVDF and the metal electrode, a question is raised for practical electrical applications using PVDF and its copolymers under high-field and high-temperature conditions. A potential method to prevent electrochemical degradation of PVDF is proposed in this study.

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Crystalline forms of PVDF fiber filled with clay components along processing steps

Boudriaux

Rault

Cochrane

et al. 2015

J of Applied Polymer Sci

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There is a growing interest in the supply of autonomous electronic devices, particularly in the field of smart textiles. Energy harvesting is considered as a clean and renewable alternative technology to reach this objective. One of the methods explored is scavenging the energy from ambient mechanical vibrations by using piezoelectric materials. Due to textile requirements, the development of PVDF based fibers appears to be an interesting solution. However, the amount of its b crystalline form should be as high as possible. PVDF/clay components (modified or unmodified clay as well as organic modifier) containing up to 5 wt % additive are prepared by melt spinning. FTIR and XRD experiments show that the most important factor for obtaining high levels of b crystalline form is to increase the drawing ratio. The results indicate also that an organic modifier (quaternary ammonium salt) influences the crystalline forms and leads to a high ratio of b phases.

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Dynamics of polarization growth and polarization reversal in PVDF films

Cited by 10 publications

References 4 publications

A novel displacement component in PVDF and its role in ferroelectric switching

A novel displacement component in PVDF and its role in ferroelectric switching

Semicrystalline Structure–Dielectric Property Relationship and Electrical Conduction in a Biaxially Oriented Poly(vinylidene fluoride) Film under High Electric Fields and High Temperatures

Crystalline forms of PVDF fiber filled with clay components along processing steps

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