The hydrothermal ageing of hybrid nanocomposites formed by carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) incorporated into an epoxy matrix was studied. In order to avoid the weak interface, amine functionalized GNPs were used which are reactive with the epoxy matrix. The content of CNTs was 0.1 wt% and the GNPs content ranged from 5 to 12 wt%. The isothermal water absorption was measured until very long times (almost two years). Reduction of water absorption with the addition of either carbon nanotubes or graphene nanoplatelets has been found independently of the ageing time. The results can be described by a two-stage diffusion model with the first and second stages being diffusion and matrix relaxation controlled respectively. The obtained diffusion coefficient for the neat epoxy thermoset is higher than those of nanocomposites, which decreases with the increase of GNPs content. The effect of water absorbed on the dynamic-mechanical properties and on the electrical conductivity of the nanocomposites was analyzed. Whatever the temperature the storage modulus shows a continuous increase with the increase of the nanoparticles content, the effect of hydrothermal ageing is to decrease the modulus only in the glassy state (T < T_g). Water aged specimens show broadening of the tanδ peak related to the plasticization of the matrix. T_g of aged specimens coincides with the one of the unaged matrix, indicating that hydrothermal ageing does not produce noticeable matrix damage even after two years. Water aged specimens show similar electrical conductivity than unaged ones, which is another indication of no degradation of samples by water.

研究了碳纳米管（CNTs）和石墨烯纳米片（GNPs）掺入环氧基质中形成的杂化纳米复合材料的水热老化。为了避免弱的界面，使用了胺官能化的GNP，它们与环氧基质具有反应性。CNT的含量为0.1重量％，GNP的含量为5至12重量％。一直等到很长时间（将近两年）才测量等温吸水率。已经发现，通过添加碳纳米管或石墨烯纳米片减少吸水率与老化时间无关。结果可以通过两阶段扩散模型来描述，第一阶段和第二阶段分别是扩散和基质松弛控制。所得纯环氧热固性树脂的扩散系数高于纳米复合材料的扩散系数，随着国民生产总值含量的增加而减少。分析了吸水对纳米复合材料动态力学性能和电导率的影响。无论在什么温度下，储能模量都随着纳米颗粒含量的增加而连续增加，水热老化的作用是仅在玻璃态下降低模量（T  <  T _g）。水中年标本显示出扩大的正切δ相关矩阵的塑化峰。老化试样的T _g与未老化基体之一一致，表明即使经过两年水热老化也不会产生明显的基体损伤。水老化试样的电导率与未老化试样的电导率相似，这又表明水不会降解样品。