Thermal-Aging Behavior of Bo-Pp Films

Umemura, Tokihiro; Abe, Kazuhide; Akiyama, K.; Couderc, D.

doi:10.1109/tei.1987.298935

Cited by 10 publications

(7 citation statements)

References 15 publications

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“…A perfectly pure polymer film (where all of the films are contaminated by ambient air or grease stains or are contaminated deliberately or during manufacturing) does not exist [61]. No polymer film has a fully crystalline grade, that is, polymer films exhibit varying degrees of crystallisation; for example, BOPP films include crystalline and amorphous zones [62], [63]. The dielectric loss of the BOPP film is 0.0002 at temperatures up to 85 • C and considerably increases because of electronic conductivity as temperatures exceed 85 • C [64], [65].…”

Section: Thermal and Electrical Impacts On Dielectric Films A Tmentioning

confidence: 99%

“…The dielectric loss of the BOPP film is 0.0002 at temperatures up to 85 • C and considerably increases because of electronic conductivity as temperatures exceed 85 • C [64], [65]. Excessive heat morphologically changes dielectric materials [62]. High film purity, antioxidant amount and impurities are critical factors that affect film performance at high temperatures and under strong electric fields.…”

Section: Thermal and Electrical Impacts On Dielectric Films A Tmentioning

confidence: 99%

“…Thermal ageing results in the conversion of part of the amorphous phase of the film to the crystalline phase and an increase in the amounts of high molecular-weight materials in the surface layer, where impurities and low-molecular-weight materials have been rejected from the bulk materials in the aged film. Consequently, the amount of impurities and low molecular-weight materials on the surface layer of the film increases as the crystalline phase increases [4], [62], [72]. The amorphous region is affected by high temperatures given its low melting point.…”

Section: Thermal and Electrical Impacts On Dielectric Films A Tmentioning

confidence: 99%

“…The conduction current mechanism is attributed to the relaxation of the oriented amorphous phase and/or an increase in ionic concentration [73]. Increments in temperature result in a chemical change in the polymer film and act as the thermal activator of chemical reactions that are inert at low temperatures [4], [62]. The thermal activation energy of the BOPP film is 0.76eV [64].…”

Section: Thermal and Electrical Impacts On Dielectric Films A Tmentioning

confidence: 99%

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Ageing: Causes and Effects on the Reliability of Polypropylene Film Used for HVDC Capacitor

Umran

Wang

2020

IEEE Access

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It is well-known that the high-performance polymeric dielectric films used for high-voltage DC capacitors should have outstanding capabilities in terms of electrical and mechanical properties in order to face harsh operating conditions. Many factors limit the ability of these thin films to face different and growing stresses according to modern electrical requirements. Microstructure properties, additives, impurities, defects formed during manufacturing as well as applied stress types significantly affect the performance of dielectric films and their operational lifetime. This paper presents a comprehensive review of the factors which affect the ageing, degradation and breakdown of metallised polypropylene (PP) capacitors films. The effects of microstructure, surface morphological properties, mechanical properties and defects on the reliability of biaxially oriented polypropylene films (BOPP) are studied. In addition, the phenomena affecting dielectric performance and ageing mechanisms which are induced by electrical, thermal and electrothermal stresses are discussed.

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Section: Thermal and Electrical Impacts On Dielectric Films A Tmentioning

confidence: 99%

Section: Thermal and Electrical Impacts On Dielectric Films A Tmentioning

confidence: 99%

Section: Thermal and Electrical Impacts On Dielectric Films A Tmentioning

confidence: 99%

Section: Thermal and Electrical Impacts On Dielectric Films A Tmentioning

confidence: 99%

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Ageing: Causes and Effects on the Reliability of Polypropylene Film Used for HVDC Capacitor

Umran

Wang

2020

IEEE Access

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“…Many studies on electrical conduction characteristics of PP films, including the relationship between their morphology and chemical structure, have been made, Sakaoku 2 has observed electron microscopy of drawn PP, Ikezake et al have studied the effect of crystallinity on electrical conduction in PP, Phillips 4 has investigated some morphology-electrical property relationships between polymers, and Umemura et al 5 and Abe et al 6 have studied the influence of thermal-aging on morphology and electrical properties of biaxially oriented PP(OPP) films. Many studies on electrical conduction characteristics of PP films, including the relationship between their morphology and chemical structure, have been made, Sakaoku 2 has observed electron microscopy of drawn PP, Ikezake et al have studied the effect of crystallinity on electrical conduction in PP, Phillips 4 has investigated some morphology-electrical property relationships between polymers, and Umemura et al 5 and Abe et al 6 have studied the influence of thermal-aging on morphology and electrical properties of biaxially oriented PP(OPP) films.…”

Section: Negative Resistance and Current Oscillation Phenomena In Orimentioning

confidence: 99%

Negative Resistance and Current Oscillation Phenomena in Oriented Polypropylene Films

Lee¹,

Kim²,

Jung³

et al. 1997

J. Electrochem. Soc.

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The conduction characteristics in oriented polypropylene (OPP) film were studied over field intensities between 10 and 300 MV/rn and a range of temperature from 5 to 55°C. The range of the conduction characteristics observed at 15°C was divided into five regions with increasing field intensity. Particularly, in the region from 70 to 82 MV/rn voltage-controlled negative resistance was displayed. In the negative resistance region, current oscillations were also observed and the mobility of carriers was 1.44 >< 10_is m2/V s. The negative resistance characteristics could be explained by Gibbons' theory. ABSTRACTThe conduction characteristics in oriented polypropylene (OPP) film were studied over field intensities between 10 and 300 MV/m and a range of temperature from 5 to 55°C. The range of the conduction characteristics observed at 15°C was divided into five regions with increasing field intensity. Particularly, in the region from 70 to 82 MV/m voltage-controlled negative resistance was displayed. In the negative resistance region, current oscillations were also observed and the mobility of carriers was 1.44 x 10 -" 3 m2/V s. The negative resistance characteristics could be explained by Gibbons' theory. ABSTRACTElectrochemical hydrogen absorption and desorption into/from Pd and Pd-Li alloys were studied in a molten LiCl-KC1-LiH system (5 mole percent LiH added) at 673 K. A cyclic voltammogram for a Pd electrode indicates that the current is largely due to a hydrogen-related reaction and partly due to a Li-related reaction. Pd spontaneously changes into PdLiH, merely by immersion into the molten LiCl-KCl-LiH system, because the anodic hydrogen absorption and the cathodic lithium deposition occur on the same surface. By chronopotentiometry, H/Pd ratios were estimated for Pd, Pd 7 Li, Pd 2 Li, and PdLi electrodes after hydrogen charging at 0.6 V for 0.5 h as 0.05, 0.08, 0.27, and 0.74, respectively. These results show that the hydrogen absorbing ability of the alloys increases as the Li concentration increases. These characteristics can be explained by the stronger interaction of Li-H than of Pd-H.

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Research insight into the change of aggregation structure of BOPP films and its influence on electrical properties under accelerated thermal aging

Zhang,

Liu

et al. 2024

J of Applied Polymer Sci

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Biaxially oriented polypropylene (BOPP) film used in pulse film capacitors withstands high temperatures for a long time. This leads to frequent faults in pulse film capacitors, affecting the reliability of the pulse system. In this paper, the thermal aging tests of BOPP films at 100°C for 10–80 days are carried out in this paper, and the physicochemical and electrical properties of the aging materials are characterized. The results show that more deep and shallow traps to BOPP films are introduced during the thermal aging process. With the increase in aging time, the breakdown field strength gradually decreases, and the conductivity decreases first and then increases. Under the action of thermal aging for a long time, the recrystallization of materials and the destruction of molecular chains by thermal aging are the main reasons for the increase of traps and the decrease of breakdown field strength. The former is dominant in the early stage of aging, and the latter is dominant in the late stage of aging. Therefore, the conductivity shows the law of slow decrease first and then rapid increase. The relevant research provides a theoretical foundation for the process improvement and life prediction of BOPP films.

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Thermal-Aging Behavior of Bo-Pp Films

Cited by 10 publications

References 15 publications

Ageing: Causes and Effects on the Reliability of Polypropylene Film Used for HVDC Capacitor

Ageing: Causes and Effects on the Reliability of Polypropylene Film Used for HVDC Capacitor

Negative Resistance and Current Oscillation Phenomena in Oriented Polypropylene Films

Research insight into the change of aggregation structure of BOPP films and its influence on electrical properties under accelerated thermal aging

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