On TSD in PVDF in the temperature range -60 degrees C to 165 degrees C. I

Eliasson, Sara

doi:10.1088/0022-3727/18/2/015

Cited by 25 publications

(12 citation statements)

References 14 publications

(10 reference statements)

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“…In comparison to this, TSD current measurement yields several more or less distinct polarization bands,1, 2 which are in general due to individual depolarization mechanism. TSDC measurement is one of the important methods3 for identifying and characterizing relaxation processes in electrified dielectrics and charged polymer electrets 4–6. It also helps to understand the phenomenon of charge storage and charge decay process in electrets.…”

Section: Introductionmentioning

confidence: 99%

Thermally stimulated depolarization study in polyvinylidenefluoride–polysulfone polyblend films

Saxena

Gaur

2010

J of Applied Polymer Sci

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Thermally stimulated depolarization currents (TSDCs) in short-and open-circuit modes in polyvinylidenefluoride (PVDF)-polysulfone (PSF) polyblend have been recorded. The TSDC thermograms of PVDF and PSF in short-circuit mode show two peaks, whereas the polyblend of the two polymers shows a single peak. With the increase in PSF weight percentage in the polyblend, the magnitude of TSDC peak current increased and the peak current position shifted toward the lower temperature side. The single peak in polyblend appears at 165 C 6 10 C, which is at higher temperature than the temperature of low-temperature peak for individual polymers. This suggests that this peak may be due to dipolar polarization. Subsequently, shifting of peak toward higher temperature side with increase in polarizing temperature indicates the space charge peak. This contradiction has been explained on the basis of induced dipole theory. The behavior of short circuit TSDC could be explained in terms of the heterocharge caused by dipole orientation and ionic homocharge drift, together with the injection of charge car-riers from electrodes and their subsequent localization in surface and bulk traps. However, two oppositely directed TSDC peaks observed in open-circuit mode in all the polyblend samples could be considered as the result of superposition of two overlapped and oppositely directed peaks, one caused by relaxation of dipole polarization and the other by the space charge. Thus, we have compared TSDC measured in open-and short-circuit modes to distinguish between these two relaxation processes and separate them. There is only one broad peak observed in the short-circuit mode of the polyblend, which entirely corresponds to the relaxation of dipole polarization. Insertion of a dielectric gap in the open-circuit mode does not affect the dipole current, but the space charge component flowing in the opposite direction is added to the former.

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Section: Introductionmentioning

confidence: 99%

Thermally stimulated depolarization study in polyvinylidenefluoride–polysulfone polyblend films

Saxena

Gaur

2010

J of Applied Polymer Sci

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“…The TSD measuring procedure has been described in a previous paper (Eliasson 1985). In the present work the measurements were mostly performed on form I1 Solef PVDF, 20 pm thick, from Solvay et Cie. Circular A1 electrodes approximately 50 nm thick were applied on both sample surfaces by vacuum evaporation.…”

Section: Methodsmentioning

confidence: 99%

“…In a previous paper (Eliasson 1985), results were reported from a systematic thermally stimulated discharge (TSD) study on polyvinylidene fluoride (PVDF) that had been poled in electric fields of the order 100400 kV cm". Five TSD peaks were observed in.the temperature range from -60 to 165 "C. The peak maxima occurred at the approximate temperatures -40, -20,70,95 and 160 "C, respectively.…”

Section: Introductionmentioning

confidence: 99%

On TSD in PVDF in the temperature range -60 to 165 degrees C. II

Eliasson

1986

J. Phys. D: Appl. Phys.

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For pt.I see ibid., vol.18, p.275 (1985). Thin films of polyvinylidene fluoride (PVDF), originally in crystal form II, were subjected to thermally stimulated discharge (TSD) studies after poling with electric fields of the order of 0.5-2 MV cm-1. In samples subjected to the stronger fields, a new TSD peak at 0 degrees C was discovered, the magnitude of which was found to be dependent upon the choice of electrode material. X-ray diffraction studies showed that the electrode material also affected the amount of structural conversion that was caused by high poling fields. Since there are certain indications that the new peak is of dipolar origin, it is suggested that injection space charge affected the polarisation in an indirect way, primarily influencing the amount of conversion taking place.

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“…29,34,45,46,49,74,83,104,119,128,129,140 It was found by Sasabe et al 107 that PVDF shows three relaxations. In the TSC measurements, the α a -relaxation at around −30 ○ C corresponds to the glass transition and is attributed to the micro-Brownian motion of the amorphous phase, the α c -relaxation is assigned to molecular motions in the crystalline regions of α-PVDF and is found at 80 ○ C. At temperatures of around −50 ○ C and at frequencies between 100 Hz and 1 kHz the dielectric spectra reveal the β-relaxation attributed to local motions within the frozen main chains in the amorphous regions.…”

Section: Effect Of Stable Ferroelectric Polarization On Thermally Stimentioning

confidence: 97%

Stability of polarization in organic ferroelectric metal-insulator-semiconductor structures

Kalbitz

Frübing

Gerhard

et al. 2011

Applied Physics Letters

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Dielectric measurements have been carried out on all-organic metal-insulator-semiconductor structures with the ferroelectric polymer poly(vinylidenefluoride-trifluoroethylene) as the gate insulator. It is shown that the polarization states remain stable after poling with accumulation and depletion voltage. However, negative charge trapped at the semiconductor-insulator interface during the depletion cycle masks the negative shift in flatband voltage expected during the sweep to accumulation voltages.

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On TSD in PVDF in the temperature range -60 degrees C to 165 degrees C. I

Cited by 25 publications

References 14 publications

Thermally stimulated depolarization study in polyvinylidenefluoride–polysulfone polyblend films

Thermally stimulated depolarization study in polyvinylidenefluoride–polysulfone polyblend films

On TSD in PVDF in the temperature range -60 to 165 degrees C. II

Stability of polarization in organic ferroelectric metal-insulator-semiconductor structures

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