Mitigation of Degradation in Polymers by Gamma Rays

Ohki, Yoshimichi; Miyazaki, Yoshio; Zhou, Huijuan; Sumita, Momoka; Someya, Takumi; Hirai, Naoshi

doi:10.1109/icpadm49635.2021.9493858

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…The authors have measured CL and FT-mIR spectra for many organic polymers such as low-density polyethylene (LDPE), cross-linked polyethylene (XLPE), ethylene propylene diene copolymer (EPDM), and epoxy resin (EP). 13,15) Especially, in Ref. 15, the authors compared the increment in carbonyl-related absorption intensity observed experimentally before and after the measurement of CL for LDPE, XLPE, EPDM, EP, and SiR.…”

Section: Resultsmentioning

confidence: 99%

“…To our best knowledge, these two luminous sources are assumed a priori in most papers dealing with CL from organic polymers. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The reason for this is that the degradation occurs as a result of oxidation of carbon atoms in organic polymers with C-C bonds as their main chains. However, the oxidation of carbon atoms should not be induced so much in SiR with siloxane main chains.…”

Section: Introductionmentioning

confidence: 99%

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Possible cause of chemiluminescence in silicone rubber

Ohki¹,

Hirai²

2020

Jpn. J. Appl. Phys.

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Chemiluminescence (CL) was observed in silicone rubber (SiR), an important electrical insulating material. Fourier-transform mid-infrared absorption spectra were also measured before and after the CL measurement. When SiR was heated at 250 °C, CL clearly appeared in 20 min. It was also confirmed that no carbonyl groups were induced by the heating during the CL measurement. A possible mechanism to explain these results is that the oxidation of silicon, which induces the cross-linking of siloxane bonds and the formation of silica particles, generates the CL.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Possible cause of chemiluminescence in silicone rubber

Ohki¹,

Hirai²

2020

Jpn. J. Appl. Phys.

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Various Characteristics of Severely Aged Flame‐Retardant Cross‐Linked Polyolefin

Zhou

Hirai

Ohki

2021

IEEJ Transactions Elec Engng

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Flame-retardant cross-linked polyolefin (FR-XLPO), is widely used as insulators for electric cables. Several cables installed in nuclear power plants must be functional even when they suffer a severe accident. Therefore, sheets of FR-XLPO were exposed to heat, gamma rays, and high-temperature steam. Before and after such aging treatments, samples' mechanical and thermal properties and infrared and THz absorption spectra were measured. As a result, it has become clear that FR-XLPO is fairly resistant to superheated steam with no oxygen, although it is easily degraded thermally if oxygen is present. It is also resistant to gamma rays to a certain extent.

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