EVALUATION OF PHYSICAL AND COMPOSITIONAL CHANGES OF REPAIR ADHESIVE USING SURFACE AND INTERFACE CUTTING ANALYSIS SYSTEM

Abstract

 The main required performance of repair adhesives is adhesion, and the change of the material properties on the adhesion surface is important in the durability evaluation. However, it has been difficult to directly evaluate the change in strength of adhesive surface part so far. Therefore, we analyzed the surface strength change accompanying the deterioration of epoxy resin by using surface / interface cutting analysis system. By using the surface / interface cutting analysis system, it became clear that the way of being affected by water absorption and drying changed depending on the kind of curing agent. In the accelerated degradation test with alkaline solution, it became clear that the surface strength greatly decreased initially, then became slow as the immersion time prolonged, and the deteriorated form changed with time. Furthermore, deterioration of the adhesive was dominant by alkali, but it was confirmed that it is also susceptible to water influence at the initial stage. The evaluation of the mechanical properties of the micro area on the surface using the surface and interface cutting analysis device can quantify the progress of deterioration, and is considered useful for evaluating the durability of the adhesive.