Anhydride cured epoxy resins are always used as pivotal solid insulation medium in many electrical equipment, which will decompose due to the high temperature caused by partial discharge and the presence of oxygen will aggravate this process. In order to explore the influence of oxygen on the thermal decomposition characteristics of epoxy resin cured by anhydride, simulation models are established in this paper. The ReaxFF force field is used to simulate the pyrolysis process of epoxy resin and the changes in production of small molecular gases (such as CO₂, H₂O, CO and CH₂O), and C₂, C₃ are discussed. The results show that the oxygen will affect the main chain of the epoxy resin by introducing a carbon-oxygen double bond to the tertiary carbon atom attached to oxygen atom. Meanwhile, with the presence of oxygen, all the products' initial generation time will be earlier, the amount of CO₂ will increase, the amount of H₂O will go up dramatically while that of CH₂O remain basically unchanged, the types and quantities of C₂ and C₃ products increase obviously, mainly reflected in the oxygenated products.

酸酐固化的环氧树脂在许多电气设备中始终用作关键的固体绝缘介质，由于局部放电引起的高温而分解，并且氧气的存在会加剧该过程。为了探索氧对酸酐固化环氧树脂热分解特性的影响，建立了仿真模型。ReaxFF力场用于模拟环氧树脂的热解过程以及小分子气体（如CO ₂，H ₂ O，CO和CH ₂ O）以及C ₂，C _{3的产生变化}讨论。结果表明，氧将通过将碳-氧双键引入与氧原子相连的叔碳原子上而影响环氧树脂的主链。同时，在存在氧气的情况下，所有产品的初始生成时间会更早，CO ₂的量将增加，H ₂ O的量将急剧增加，而CH ₂ O的量基本保持不变，类型和C ₂和C ₃产物的数量明显增加，主要反映在含氧产物中。