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Simultaneous aging of DGEBA/MeHHPA epoxy resin under thermal heating and gamma irradiation up to 1000 kGy

环氧树脂 缩水甘油醚 玻璃化转变 双酚A 材料科学 辐照 热稳定性 复合材料 极限抗拉强度 降级(电信) 核化学 聚合物 化学 有机化学 电信 物理 计算机科学 核物理学
作者
Zhenyan Ji,Fan Zhang,Hongbing Chen,Weirong He,Zhe Xing,Guozhong Wu
出处
期刊:Polymer Degradation and Stability [Elsevier BV]
卷期号:199: 109908-109908 被引量:6
标识
DOI:10.1016/j.polymdegradstab.2022.109908
摘要

Although epoxy resins in nuclear facilities may be exposed to elevated temperatures and gamma irradiation, changes in the chemical structures and mechanical properties of a diglycidyl ether of bisphenol-A (DGEBA)/methyl hexahydrophthalic anhydride (MeHHPA) epoxy resin under these conditions have not been reported yet. In this study, we aim to understand the accelerated aging of the DGEBA/MeHHPA epoxy resin under simultaneous thermal heating and gamma irradiation. Samples were irradiated at ambient temperature and 70 °C with a dose rate of 2 kGy/h and a total dose of up to 1000 kGy. Various characterizations were performed to investigate the changes in their chemical structures and mechanical properties. The results showed that the relative oxygen content of the resin increased near the surface owing to the degradation of the main macromolecular chains, which was accompanied by a decrease in the thermal stability and glass transition temperature (Tg). Under gamma irradiation at room temperature, the tensile strength increased with the absorbed dose up to 500 kGy and then decreased with higher doses. This trend indicated that thermal heating at 70 °C significantly enhanced the degradation of the DGEBA/MeHHPA epoxy resin upon gamma irradiation.
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