Aging behavior of flame-retardant cross-linked polyethylene in nuclear power plant environments

Zhenyu Yang, Takuya Kaneko, Naoshi Hirai, Yoshimichi Ohki

研究成果: Article

抄録

Sheets of flame-retardant cross-linked polyethylene (FR-XLPE) were aged thermally at 80, 100, 135, and 155 °C for various periods from 100 to 800 h. They were also aged concurrently by heat and gamma rays at the same temperatures for the same periods at a dose rate of 100 Gy/h. For these sheets, we measured indenter modulus, elongation at break, complex permittivity, and absorption spectra at midinfrared and THz frequencies. As a result, it has become clear that the aging at 135 °C makes FR-XLPE hard regardless of the presence of concurrent irradiation of gamma rays. This makes the transport of charge carriers difficult. Therefore, both the real and the imaginary parts of complex permittivity decrease, which is significant if the measurement frequency is low. However, this tendency becomes opposite as the samples were aged at 155 °C by heat or concurrently by heat and radiation. Using indenter modulus as an indicator, it has become clear that the aging progress is composed of two different stages, which could be a good clue to the explanation of these opposite changes in complex permittivity. On the other hand, the samples aged at 155 °C concurrently by heat and radiation show larger values in the indenter modulus and in two parts of complex permittivity than the samples aged at the same temperature only by heat. This is probably due to the oxidative degradation induced by the cooperative reaction of heat and radiation.

元の言語English
ジャーナルIEEJ Transactions on Electrical and Electronic Engineering
DOI
出版物ステータスPublished - 2019 1 1

Fingerprint

Flame retardants
Nuclear power plants
Polyethylenes
Aging of materials
Permittivity
Radiation
Gamma rays
Charge carriers
Hot Temperature
Absorption spectra
Elongation
Irradiation
Degradation
Temperature

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

これを引用

@article{d97acfaa04d44052b7258ee00bda16c7,
title = "Aging behavior of flame-retardant cross-linked polyethylene in nuclear power plant environments",
abstract = "Sheets of flame-retardant cross-linked polyethylene (FR-XLPE) were aged thermally at 80, 100, 135, and 155 °C for various periods from 100 to 800 h. They were also aged concurrently by heat and gamma rays at the same temperatures for the same periods at a dose rate of 100 Gy/h. For these sheets, we measured indenter modulus, elongation at break, complex permittivity, and absorption spectra at midinfrared and THz frequencies. As a result, it has become clear that the aging at 135 °C makes FR-XLPE hard regardless of the presence of concurrent irradiation of gamma rays. This makes the transport of charge carriers difficult. Therefore, both the real and the imaginary parts of complex permittivity decrease, which is significant if the measurement frequency is low. However, this tendency becomes opposite as the samples were aged at 155 °C by heat or concurrently by heat and radiation. Using indenter modulus as an indicator, it has become clear that the aging progress is composed of two different stages, which could be a good clue to the explanation of these opposite changes in complex permittivity. On the other hand, the samples aged at 155 °C concurrently by heat and radiation show larger values in the indenter modulus and in two parts of complex permittivity than the samples aged at the same temperature only by heat. This is probably due to the oxidative degradation induced by the cooperative reaction of heat and radiation.",
keywords = "complex permittivity, EAB, FR-XLPE, FT-MIR, indenter modulus, THz absorption",
author = "Zhenyu Yang and Takuya Kaneko and Naoshi Hirai and Yoshimichi Ohki",
year = "2019",
month = "1",
day = "1",
doi = "10.1002/tee.22910",
language = "English",
journal = "IEEJ Transactions on Electrical and Electronic Engineering",
issn = "1931-4973",
publisher = "John Wiley and Sons Inc.",

}

TY - JOUR

T1 - Aging behavior of flame-retardant cross-linked polyethylene in nuclear power plant environments

AU - Yang, Zhenyu

AU - Kaneko, Takuya

AU - Hirai, Naoshi

AU - Ohki, Yoshimichi

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Sheets of flame-retardant cross-linked polyethylene (FR-XLPE) were aged thermally at 80, 100, 135, and 155 °C for various periods from 100 to 800 h. They were also aged concurrently by heat and gamma rays at the same temperatures for the same periods at a dose rate of 100 Gy/h. For these sheets, we measured indenter modulus, elongation at break, complex permittivity, and absorption spectra at midinfrared and THz frequencies. As a result, it has become clear that the aging at 135 °C makes FR-XLPE hard regardless of the presence of concurrent irradiation of gamma rays. This makes the transport of charge carriers difficult. Therefore, both the real and the imaginary parts of complex permittivity decrease, which is significant if the measurement frequency is low. However, this tendency becomes opposite as the samples were aged at 155 °C by heat or concurrently by heat and radiation. Using indenter modulus as an indicator, it has become clear that the aging progress is composed of two different stages, which could be a good clue to the explanation of these opposite changes in complex permittivity. On the other hand, the samples aged at 155 °C concurrently by heat and radiation show larger values in the indenter modulus and in two parts of complex permittivity than the samples aged at the same temperature only by heat. This is probably due to the oxidative degradation induced by the cooperative reaction of heat and radiation.

AB - Sheets of flame-retardant cross-linked polyethylene (FR-XLPE) were aged thermally at 80, 100, 135, and 155 °C for various periods from 100 to 800 h. They were also aged concurrently by heat and gamma rays at the same temperatures for the same periods at a dose rate of 100 Gy/h. For these sheets, we measured indenter modulus, elongation at break, complex permittivity, and absorption spectra at midinfrared and THz frequencies. As a result, it has become clear that the aging at 135 °C makes FR-XLPE hard regardless of the presence of concurrent irradiation of gamma rays. This makes the transport of charge carriers difficult. Therefore, both the real and the imaginary parts of complex permittivity decrease, which is significant if the measurement frequency is low. However, this tendency becomes opposite as the samples were aged at 155 °C by heat or concurrently by heat and radiation. Using indenter modulus as an indicator, it has become clear that the aging progress is composed of two different stages, which could be a good clue to the explanation of these opposite changes in complex permittivity. On the other hand, the samples aged at 155 °C concurrently by heat and radiation show larger values in the indenter modulus and in two parts of complex permittivity than the samples aged at the same temperature only by heat. This is probably due to the oxidative degradation induced by the cooperative reaction of heat and radiation.

KW - complex permittivity

KW - EAB

KW - FR-XLPE

KW - FT-MIR

KW - indenter modulus

KW - THz absorption

UR - http://www.scopus.com/inward/record.url?scp=85066148976&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85066148976&partnerID=8YFLogxK

U2 - 10.1002/tee.22910

DO - 10.1002/tee.22910

M3 - Article

JO - IEEJ Transactions on Electrical and Electronic Engineering

JF - IEEJ Transactions on Electrical and Electronic Engineering

SN - 1931-4973

ER -