Filler and additive effects on partial discharge degradation of PET films used in PV devices

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Abstract

A series of poly(ethylene terephthalate) (PET) films with different additives were subjected to identical electrical stresses to investigate their partial discharge (PD) degradation behaviour. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to study the surface chemistry changes of the degraded samples. The filled samples showed markedly better PD resistance and lifetime compared to the unfilled PET. A filler 'pile-up' effect has been directly observed for the filled samples and is proposed as the mechanism underlying the enhanced stability. PD-induced breakdown results also revealed that TiO2 filled PET has a superior PD lifetime to BaSO4 filled PET, which could be attributed to both the higher permittivity of the TiO2 fillers and the voids that are created around the BaSO4 particles during the film orientation process. Further improvements to PD resistance and PD lifetime, through the reduction of surface oxidation, are observed for a BaSO4-filled sample additionally containing the UV stabilizer Tinuvin 1577.
LanguageEnglish
Number of pages26
JournalPolymer Degradation and Stability
Early online date9 Feb 2018
DOIs
StateE-pub ahead of print - 9 Feb 2018

Fingerprint

Partial discharges
fillers
Fillers
degradation
Degradation
life (durability)
Polyethylene Terephthalates
polyethylene terephthalate
piles
Surface chemistry
Polyethylene terephthalates
Piles
Fourier transform infrared spectroscopy
voids
Permittivity
X ray photoelectron spectroscopy
breakdown
infrared spectroscopy
photoelectron spectroscopy
chemistry

Keywords

  • poly(ethylene terephthalate)
  • photovoltaic
  • partial discharge
  • fillers
  • UV stabilizer

Cite this

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title = "Filler and additive effects on partial discharge degradation of PET films used in PV devices",
abstract = "A series of poly(ethylene terephthalate) (PET) films with different additives were subjected to identical electrical stresses to investigate their partial discharge (PD) degradation behaviour. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to study the surface chemistry changes of the degraded samples. The filled samples showed markedly better PD resistance and lifetime compared to the unfilled PET. A filler 'pile-up' effect has been directly observed for the filled samples and is proposed as the mechanism underlying the enhanced stability. PD-induced breakdown results also revealed that TiO2 filled PET has a superior PD lifetime to BaSO4 filled PET, which could be attributed to both the higher permittivity of the TiO2 fillers and the voids that are created around the BaSO4 particles during the film orientation process. Further improvements to PD resistance and PD lifetime, through the reduction of surface oxidation, are observed for a BaSO4-filled sample additionally containing the UV stabilizer Tinuvin 1577.",
keywords = "poly(ethylene terephthalate) , photovoltaic, partial discharge, fillers, UV stabilizer",
author = "Rong Tang and Liggat, {John J.} and Siew, {Wah H.}",
year = "2018",
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journal = "Polymer Degradation and Stability",
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AU - Tang,Rong

AU - Liggat,John J.

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N2 - A series of poly(ethylene terephthalate) (PET) films with different additives were subjected to identical electrical stresses to investigate their partial discharge (PD) degradation behaviour. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to study the surface chemistry changes of the degraded samples. The filled samples showed markedly better PD resistance and lifetime compared to the unfilled PET. A filler 'pile-up' effect has been directly observed for the filled samples and is proposed as the mechanism underlying the enhanced stability. PD-induced breakdown results also revealed that TiO2 filled PET has a superior PD lifetime to BaSO4 filled PET, which could be attributed to both the higher permittivity of the TiO2 fillers and the voids that are created around the BaSO4 particles during the film orientation process. Further improvements to PD resistance and PD lifetime, through the reduction of surface oxidation, are observed for a BaSO4-filled sample additionally containing the UV stabilizer Tinuvin 1577.

AB - A series of poly(ethylene terephthalate) (PET) films with different additives were subjected to identical electrical stresses to investigate their partial discharge (PD) degradation behaviour. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to study the surface chemistry changes of the degraded samples. The filled samples showed markedly better PD resistance and lifetime compared to the unfilled PET. A filler 'pile-up' effect has been directly observed for the filled samples and is proposed as the mechanism underlying the enhanced stability. PD-induced breakdown results also revealed that TiO2 filled PET has a superior PD lifetime to BaSO4 filled PET, which could be attributed to both the higher permittivity of the TiO2 fillers and the voids that are created around the BaSO4 particles during the film orientation process. Further improvements to PD resistance and PD lifetime, through the reduction of surface oxidation, are observed for a BaSO4-filled sample additionally containing the UV stabilizer Tinuvin 1577.

KW - poly(ethylene terephthalate)

KW - photovoltaic

KW - partial discharge

KW - fillers

KW - UV stabilizer

UR - https://www.sciencedirect.com/journal/polymer-degradation-and-stability

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