ABSTRACT

The durability of bonded structures in wet environments is the subject of a large number of studies. The long-term behaviour of these structures is affected and driven by the water diffusion within the adhesive. The literature highlights that the creation of interphases, particular area where chemical and physical bonds are established between the adhesive and the substrate, play an important role in water diffusion kinetics. The aim of this study is to provide amethod to characterize the mean water diffusive properties of the interphases of a bonded assembly in immersion. This approach includes global gravimetric tests of an assembly and an analytical model to characterize its water diffusive parameters. The model divides the bonded joint into two separate layers: one layer representing the adhesive and the other the interfacial area. The water content of each layer can then be estimated using analytical equations. Diffusion parameters are then deduced from these water contents. A greater and faster water diffusion within the interfacial zone has been highlighted. The approach presented here allows to quantify it.

摘要

粘合结构在潮湿环境中的耐久性是大量研究的主题。这些结构的长期行为受到粘合剂内水扩散的影响和驱动。文献强调，界面相的产生，特别是在粘合剂和基材之间建立化学和物理键的区域，在水扩散动力学中起着重要作用。本研究的目的是提供一种方法来表征浸没中粘合组件的界面的平均水扩散特性。这种方法包括一个组件的全局重量测试和一个分析模型，以表征其水扩散参数。该模型将粘合接头分为两个单独的层：一层代表粘合剂，另一层代表界面区域。然后可以使用解析方程估计每一层的含水量。然后从这些水含量推导出扩散参数。强调了界面区域内更大和更快的水扩散。这里介绍的方法允许对其进行量化。