5.3 MeV α-辐照对邻甲基酚醛环氧树脂的影响及损伤机理

IF 3.2 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2025-08-08 DOI:10.1016/j.jnucmat.2025.156089

Zhao Sun , Yunyun Lu , Liyuan Deng , Zhencen He , Qi Cao , Zhimin Hu

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引用次数: 0

摘要

研究了6 MGy α-辐照下邻甲基酚醛环氧树脂（EOCN）的结构损伤机制。利用石英晶体耗散微天平（QCM-D）进行的原位纳克级质量测量显示，从2 MGy开始加速降解，伴随着持续的松弛效应。傅里叶变换红外光谱（FTIR）和x射线光电子能谱（XPS）分析证实，环氧基的裂解是主要的降解途径，而多个官能团的同时裂解是一个复杂的降解机制。电子顺磁共振（EPR）谱显示单线态自由基浓度呈剂量依赖性增加。采用量子化学计算和反应力场分子动力学（ReaxFF-MD）模拟，定性分析了实验鉴定的关键官能团的物理化学特征。在此基础上，重构了α-颗粒诱导的两种乙醚键断裂降解途径，以及与之相关的小分子降解产物的演化过程。

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The effect and damage mechanism of 5.3 MeV α-irradiation on O-methyl phenolic epoxy resin

This study elucidated the structural damage mechanisms of O-methyl phenolic epoxy resin (EOCN) under α-irradiation up to 6 MGy. In situ nanogram-level mass measurements using quartz crystal microbalance with dissipation (QCM-D) revealed accelerated degradation beginning at 2 MGy, accompanied by persistent relaxation effects. Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses confirmed that the cleavage of epoxy groups constituted the primary degradation pathway, while the simultaneous scission of multiple functional groups contributed to a complex degradation mechanism. Electron paramagnetic resonance (EPR) spectroscopy demonstrated a dose-dependent increase in the concentration of singlet free radicals. Quantum chemical calculations and reactive force field molecular dynamics (ReaxFF-MD) simulations were employed to qualitatively analyze the physicochemical characteristics of key functional groups identified experimentally. Based on these results, two ether bond-breakage degradation pathways were induced by α-particles were reconstructed, along with the associated evolution processes of small-molecule degradation products.

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来源期刊

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.