Study of dielectric relaxation and persistence of polarization in polysulfone foils sensitized with malachite green using transient discharging current

Sahu, Pooja Devi; Khare, P. K.; Kumari, Sarita; Pendke, Poonam

doi:10.1063/1.5122342

Cited by 1 publication

(2 citation statements)

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“…For the first few seconds (short time region), the current decays at a faster rate, and subsequently, it slows down (long time region). The existing transient's observed time dependence follows the Curie‐Von Schweidler law 15 . The calculated slope “n” values for the two regions shown in Table 1, n 1 for a short time and n 2 for a long time, were found to be in the range of 0.09–0.68 for shorter time and 0.14–1.29 for a longer time.…”

Section: Resultsmentioning

confidence: 78%

“…The existing transient's observed time dependence follows the Curie-Von Schweidler law. 15 The calculated slope "n" values for the two regions shown in Table 1, n 1 for a short time and n 2 for a long time, were found to be in the range of 0.09-0.68 for shorter time and 0.14-1.29 for a longer time. The rate of fall of transient absorption currents is likewise seen to be slower for lower polarization fields than for higher fields, indicating that the polarizing time (t m ) decreases with increasing polarization field.…”

Section: Resultsmentioning

confidence: 88%

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Analysis of dielectric behavior of PVDF: PSF polyblends at lower frequency range from measurements of transient absorption and desorption currents

Saxena¹,

Shukla

2021

J of Applied Polymer Sci

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Transient current measurements were carried out for polyvinylidene fluoride:polysulfone (PVDF:PSF) blends films of different ratios under different polarizing fields and polarizing temperatures in absorption and desorption mode. The time‐dependent desorption current in polymer blend samples interprets the combined effect of dipole reorientation, space charge dissipation, and hopping of charge carriers. The activation energy has been calculated using the isochronal curve. Thermal activation behaviors of isochronal current in a specific temperature scale followed by a peak centered at about 120–160°C, have indicated the close correlation of transient currents with the dielectric loss peak. The presence of a dielectric loss peak for each polyblend concentration may be due to the existence of relaxing dipoles in the polyblend. With increasing concentration of PSF in the polyblend, this peak tends to shift toward the higher frequency range and suggests the speeding up of the dipolar relaxation process. The dielectric loss factor of polyblend thin films using transient study in absorption and desorption mode using applied step voltage f is related to Hamon's frequency (0.1/t).

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 88%