The effect of electric field stress on pure poly(vinyl chloride), poly(methyl methacrylate) and their polyblend samples

Khare, P. K.; Pal, Alkesh

doi:10.1016/j.elstat.2010.04.001

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…This gives rise to the Maxwell-Wagner effect. [27][28][29] These interfacial charges remain at the same place when the field is applied in the course of cooling. It has already been reported the neutralization of space charges by ohmic conduction is absent in short-circuit TSDC but it can, still, be perceived in the air-gap double-layer system.…”

Section: Resultsmentioning

confidence: 99%

Studies of the effect of temperature on charge accumulation in PVDF-PMMA double-layered thin films based on depolarization current measurements

Saxena

Shukla

2021

Journal of Elastomers & Plastics

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In this paper, we have reported the interpretation of air gap (Thermally Stimulated Depolarization Current) of surface charges in PVDF-PMMA (Polyvinylidene fluoride (PVDF)–Polymethyl methacrylate (PMMA)) double-layered polymer thin films whose decay could not be observed in metalized electrets with short-circuit TSDC. Since short-circuit TSDC is caused by the relaxations of homo- and hetero-charge flow in one direction and thus makes it difficult to identify, separate, and characterize its components, therefore, an air gap was introduced to the short-circuit TSDC technique to carry out air-gap TSDC. This technique enables one to observe the orientation of dipoles, excess charge decay by ohmic conduction, and decay of surface charge. When a dielectric is charged by an application of an external field, two charges with opposite polarity and different nature can be found. Air-gap TSDC’s of double-layer samples revealed the presence of homo charge; charges trapped at the surface are due to dissipation of space charges thus, the depolarization current is observed to have the same polarity as that of the polarization current. Hetero-charge persists at high temperatures due to the bulk polarization formed because of the electric field created by the homo-charge. Hence, the depolarization current observed in the present study was observed to be of opposite polarity as that of polarization current. The above discussed polymeric layered structure was found to be a source of charge trapping which was identified and confirmed by various calculated parameters.

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Section: Resultsmentioning

confidence: 99%

Studies of the effect of temperature on charge accumulation in PVDF-PMMA double-layered thin films based on depolarization current measurements

Saxena

Shukla

2021

Journal of Elastomers & Plastics

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“…After T g , structural rearrangement or chain segments becomes easier due to increase in its free volume. A de-trapping mechanism at higher temperature may be possible and the charge carriers may become trapped at some deeper trap levels which are available for trapping (Khare and Pal 2010).…”

Section: Resultsmentioning

confidence: 99%

“…Great care was taken to avoid air bubbles during setting of the polymer solution on the glass plates. The films were then detached carefully from the glass plate using a sharp edge knife or blade (Khare and Pal 2010).…”

Section: Methodsmentioning

confidence: 99%

Study of polarization and relaxation phenomena of polyblend films of poly(vinyl chloride) and poly(methyl methacrylate)

Pal

Khare

2013

Bull Mater Sci

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Thermally stimulated discharge current (TSDC) studies were carried out on pure poly(methyl methacrylate), poly(vinyl chloride) and polyblends (of various weight ratios, 100:0, 90:10, 80:20 and 70:30) as a function of polarizing fields at constant temperature, to study the polarization and relaxation phenomena in them. For PVC and different blends a peak around 140-180 • C and for PMMA two peaks at around 95 and 165 • C were observed. No regular variation in peak position for PMMA and blends was observed. The various TSDC parameters i.e. activation energy, charge released and relaxation times were calculated. In the blend samples it is suggested that the chains are so entangled that in the total polarization the dipolar contribution is less and the observed polarization seems to be mainly due to the formation of induced dipoles and an increase in free volume and mobility of charge carriers due to a plasticization effect. Keywords. Poly(methyl methacrylate); poly(vinyl chloride); thermally stimulated discharge current; induced dipole polarization; dipolar and space charge mechanism; plasticization effect.

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Air-gap thermally stimulated discharge currents in PVDF-PMMA double-layered samples

Saxena¹,

Shukla

Gaur

2021

J Therm Anal Calorim

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The effect of electric field stress on pure poly(vinyl chloride), poly(methyl methacrylate) and their polyblend samples

Cited by 6 publications

References 11 publications

Studies of the effect of temperature on charge accumulation in PVDF-PMMA double-layered thin films based on depolarization current measurements

Studies of the effect of temperature on charge accumulation in PVDF-PMMA double-layered thin films based on depolarization current measurements

Study of polarization and relaxation phenomena of polyblend films of poly(vinyl chloride) and poly(methyl methacrylate)

Air-gap thermally stimulated discharge currents in PVDF-PMMA double-layered samples

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