Effect of Gamma-Ray Irradiation on Dielectric Properties of PP/Elastomer/TiO2 Nanocomposite

This article focuses on electrical properties and microstructure of polypropylene (PP)/elastomer/TiO 2 nanocomposites for cable insulation in nuclear power plants (NPPs). The nanocomposite comprising isotactic PP, 30 wt% propylene-based elastomer (PBE) and 3 wt% nano-TiO 2 , undergoes 60 Co gamma-ra...

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Bibliographic Details
Main Authors: Liu, Baixin, Gao, Yu, Guo, Chenyi, Lu, Di, Si, Bosen, Du, Boxue
Format: Conference Proceeding
Language:English
Subjects:
ageing
Conductivity
Elastomers
Gamma-rays
irradiation deterioration
Nanocomposites
nuclear power plant
polypropylene insulation
Radiation effects
Temperature distribution
Temperature measurement
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Summary:This article focuses on electrical properties and microstructure of polypropylene (PP)/elastomer/TiO 2 nanocomposites for cable insulation in nuclear power plants (NPPs). The nanocomposite comprising isotactic PP, 30 wt% propylene-based elastomer (PBE) and 3 wt% nano-TiO 2 , undergoes 60 Co gamma-ray irradiation with doses ranging from 0 to 250 kGy. Electrical conductivities at different temperatures and trap distributions are measured. The obtained results indicate that the addition of nano-TiO 2 can significantly improve the electrical properties of the PP/PBE composite, characterized by reduced conductivities and increased trap depths, and these improvements persist with irradiation. As the irradiation dose increases to 250 kGy, the electrical conductivities at all temperatures increase, while trap depth and deep trap density decrease. The deterioration in electrical properties is more obvious for the sample with nano-TiO 2 , possibly attributed to the emergence of defects in microstructure induced by irradiation.
ISSN:2834-8311
DOI:10.1109/ICD59037.2024.10613178