The study is focused on quantitative characterization of water absorption and hydrothermal ageing effects in a room-temperature amine cured epoxy adhesive widely used in automotive, aerospace, construction, and marine industries. Amino-functionalized graphene oxide (mGO) nanoparticles were incorporated into the epoxy (up to 1.72 wt.%) enabled cross-linking reactions and providing high interfacial adhesion, superior reinforcement efficiency and enhanced resistance to hydrothermal ageing of nanocomposites. Anomalous water absorption accompanied by progressive weight loss of samples (down to 7%) is fitted by two-stage models considering additive and coupled contribution from water diffusion and leaching of low molecular weight epoxy species. Nanocomposites are characterized by lower water diffusivity (40%) and decreased leaching effects (70%). High reinforcing efficiency of epoxy/mGO appeared in the increased glassy and rubbery storage moduli (60%), glass transition temperature (10 °C) and activation energy of glass transition (70%) compared to the neat epoxy. Hydrothermal ageing resulted in noticeable properties degradation of samples, although to a much lower extent in the case of nanocomposites. The results will contribute to the enhancement of global durability of common epoxy-based adhesives and extension of their lifetime.

该研究的重点是对广泛用于汽车、航空航天、建筑和船舶行业的室温胺固化环氧粘合剂的吸水率和水热老化效应进行定量表征。将氨基官能化氧化石墨烯 (mGO) 纳米粒子掺入环氧树脂中（高达 1.72 wt.%），可实现交联反应，并提供高界面附着力、卓越的增强效率和增强的纳米复合材料的抗水热老化能力。反常吸水伴随着样品的逐渐重量损失（低至 7%）由两阶段模型拟合，该模型考虑了水扩散和低分子量环氧树脂物质的浸出的添加剂和耦合贡献。纳米复合材料的特点是较低的水扩散率 (40%) 和降低的浸出效果 (70%)。与纯环氧树脂相比，环氧树脂/mGO 的高增强效率表现为玻璃态和橡胶态储能模量 (60%)、玻璃化转变温度 (10 °C) 和玻璃化转变活化能 (70%) 的增加。水热老化导致样品性能明显下降，尽管在纳米复合材料的情况下程度要低得多。研究结果将有助于提高普通环氧基粘合剂的整体耐久性并延长其使用寿命。