Effect of the corona discharge in different atmospheres on the thermally stimulated charge injection of Teflon FEP

Raposo, M. Manuela M.; Ribeiro, P.A.; Giacometti, J.A.; Bento, M.A.; Mendes, Jonas

doi:10.1109/ise.1991.167295

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…As is well known in technical processes and pointed out in other publications, the SF 6 gas surrounding the sample will limit breakdown events across the sample surface and can increase and stabilize the surface potential, e.g. on Teflon FEP or on plasma-treated non-voided PP [29,30].…”

Section: Electromechanical Activity After Vacuum and Sf 6 High-pressu...mentioning

confidence: 99%

Penetration of sulfur hexafluoride into cellular polypropylene films and its effect on the electric charging and electromechanical response of ferroelectrets

Qiu

Wegener

Wirges

et al. 2005

J. Phys. D: Appl. Phys.

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Cellular polypropylene (PP) films were treated with sulfur hexafluoride (SF6) gas in order to study the SF6 penetration behaviour and optimize the electric charging conditions. There were differences in the penetration of SF6 for different cellular PP materials, depending on the microscopic properties, which manifest themselves in the voided structure as well as in the mechanical stiffnesses of the cellular films. The penetration of SF6 after long-term pressure treatment is confirmed in strongly inflated cellular PP films with a low mechanical stiffness of about 1 MPa. No SF6 penetration occurs for slightly inflated cellular PP films with smaller void sizes and higher mechanical stiffnesses of around 5.8 MPa. The observed thickness variations, the higher charging fields during corona charging because of SF6 penetration and the SF6 environment, as well as the resulting electromechanical properties are discussed.

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Section: Electromechanical Activity After Vacuum and Sf 6 High-pressu...mentioning

confidence: 99%

Penetration of sulfur hexafluoride into cellular polypropylene films and its effect on the electric charging and electromechanical response of ferroelectrets

Qiu

Wegener

Wirges

et al. 2005

J. Phys. D: Appl. Phys.

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show abstract

“…The influence of the surrounding gas, of the humidity, or of the pressure in the corona set-up during charging or poling of polymers has been investigated by many authors. After the charging of solid electrets [9] or the poling of polar polymers [10,11] in special gas atmospheres or in dry air, a higher and more stable surface potential could often be attained. The higher surface potential, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The higher surface potential, e.g. on Teflon FEP [9], has been explained with the generation of new traps at the polymer surface. The same explanation has been given for the enhanced surface-charge stability of plasma-treated solid polypropylene (PP) films [12].…”

Section: Introductionmentioning

confidence: 99%

Understanding the role of the gas in the voids during corona charging of cellular electret films - a way to enhance their piezoelectricity

Paajanen

Wegener

Gerhard

2001

J. Phys. D: Appl. Phys.

169

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The influence of the corona-charging process on the piezoelectric transducer coefficient d33 of a cellular electret film has been investigated. An increased corona voltage can be considered as a way to enhance the charge density and thus also the resulting piezoelectric effect. Higher corona-charging voltages are possible with increased ambient pressure or in suitable dielectric gases. The effect of the gas inside the voids has also been studied. Enhanced transducer coefficients were obtained by corona charging in N2 or N2O gas atmospheres at 100-450 or 100-140 kPa pressures, respectively. The highest transducer coefficients of about 790 pCN-1 were obtained when N2 gas was filled into the voids of a cellular polymer film by means of consecutive vacuum and high-pressure treatments at 295 or 313 K.

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Corona charging of electrets: models and results

Ferreira¹,

Figueiredo²

1992

IEEE Trans. Elect. Insul.

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Effect of the corona discharge in different atmospheres on the thermally stimulated charge injection of Teflon FEP

Cited by 9 publications

References 3 publications

Penetration of sulfur hexafluoride into cellular polypropylene films and its effect on the electric charging and electromechanical response of ferroelectrets

Penetration of sulfur hexafluoride into cellular polypropylene films and its effect on the electric charging and electromechanical response of ferroelectrets

Understanding the role of the gas in the voids during corona charging of cellular electret films - a way to enhance their piezoelectricity

Corona charging of electrets: models and results

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