Effects of Accelerated Thermal Aging on Polypropylene Modified by Irradiation Process

Oliani, Washington Luiz; Fermino, Danilo Marin; Lima, L.F.C.P.; Lugão, Ademar B.; Parra, D.F.

doi:10.1002/9781119093404.ch82

Cited by 6 publications

(1 citation statement)

References 16 publications

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“…Segments of the degraded polymer by thermal ageing leads to displaced the initial temperature of the sample to lower value. The higher difference in temperatures between aged and reference samples may be attributed to the chain scission effect [77].…”

Section: Thermal and Electrical Impacts On Dielectric Films A Tmentioning

confidence: 99%

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%

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

Umran

Wang

2020

IEEE Access

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Degradation Study of High Melt Strength Polypropylene/Clay Nanocomposites in Environmental and Accelerated Conditions

Komatsu¹,

Parra²,

Oliani³

et al. 2016

TMS 2016: 145^thAnnual Meeting &Amp; Exhibition: Supplemental Proceedings

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Thermal Ageing and Accelerated Weathering of HMSPP: Structural and Morphological Studies

Oliani

Komatsu

Lugão

et al. 2016

Macromolecular Symposia

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This work focuses of the influence of weathering factors À UV radiation, humidity, and temperature on the structure and morphology poly(propylene) (PP) with high melt strength (HMSPP), also called poly(propylene) modified by irradiation. The HMSPP was prepared from isotactic poly(propylene) (iPP) in presence of acetylene at 110 kPa pressure and irradiated with g of 60 Co at doses of 5, 12.5 and 20 kGy. It has been observed that HMSPP deteriorates in the weathering and thermal resistance, and the long-term stability of HMSPP, beyond substantial color changes. The aged samples were characterized by infrared spectroscopy (FTIR), optical microscopy (OM) and differential scanning calorimetry (DSC). The optical microscopy shows different mechanisms on thermal and artificial weathering ageing. The ageing result under elevated temperature in HMSPPs exposed surfaces follows the order: HMSPP 20 > 12.5 > 5 kGy > iPP. The intense crack formation in surface exposed justifies thermooxidative degradation.

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Effects of Accelerated Thermal Aging on Polypropylene Modified by Irradiation Process

Cited by 6 publications

References 16 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

Degradation Study of High Melt Strength Polypropylene/Clay Nanocomposites in Environmental and Accelerated Conditions

Thermal Ageing and Accelerated Weathering of HMSPP: Structural and Morphological Studies

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