Gamma-irradiation-induced surface traps in polymethyl methacrylate: Evolution and impact on insulation performance

被引：0

作者：

Zhou, Yawei ^{[1
]}

Yang, Shi ^{[1
]}

Hu, Yixiang ^{[1
]}

He, Deyu ^{[1
]}

Zhong, Aixu ^{[1
]}

Yin, Jiahui ^{[1
]}

Luo, Weixi ^{[1
]}

He, Chunqing ^{[2
]}

机构：

[1] National Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi'an,710024, China

[2] Key Lab of Nuclear Solid State Physics Hubei Province, School of Physics and Technology, Wuhan University, Wuhan,430072, China

来源：

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | 2025年 / 567卷

关键词：

Charge trapping - Dielectric materials - Gamma rays - Insulation - Irradiation - Photodegradation - Positron annihilation - Positron annihilation spectroscopy - Surface properties - Vacuum applications;

D O I：

10.1016/j.nimb.2025.165817

中图分类号：

学科分类号：

摘要：

The evolution of gamma-irradiation-induced surface traps and their impact on the insulation properties of polymethyl methacrylate (PMMA) were investigated. Gamma irradiation was carried out at room temperature using a 60Co source, with irradiation doses are 0.1, 1.0, 10, 100 kGy, respectively. The surface morphologies, free volume, trap distribution, and vacuum surface flashover properties of both pristine and gamma-irradiated samples were measured. Cracks and holes appeared on the surface of PMMA samples successively after gamma irradiation. Both cross-linking and degradation reactions occur simultaneously during the irradiation process. Gamma irradiation alters PMMA surface microstructure, directly affecting its vacuum insulation performance via trap formation. Appropriate gamma irradiation is an effective method to improve the vacuum surface insulation properties of PMMA. Positron annihilation lifetime spectroscopy is proposed as a new method to characterize the surface trap properties of dielectric materials. © 2025 Elsevier B.V.

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