BOUNDARY LAYER STRUCTURE AND THE INTERPHASE BEHAVIOR IN ADHESIVE-BONDED METAL LAMINATED COMPOSITES

摘要

Interface and/or interphase structure is considered to be a focus point of scientific and technological interests in composite materials science and engineering. By taking adhesive-bonded metal laminated composites as an interesting example, the polymer boundary layer is found to form an oriented structure perpendicular to the metal surface. Under relatively small tensile or shear loading, this anisotropic structure fails first And under a hydrothermal condition, this structure leads often to an earlier aging due to its extremely alternating densities. On the other hand, there are porous boundary layer structures on μ-scale occurred on me metal surface, depending on the pre-treatment methods and the parameters. Because of the porosity, pre-polymer adhesives are able to penetrate into the oxide structure to form a three-dimensional interphase structure, a polymer/metal oxide composite structure. This interphase structure determines the mechanical and the aging behavior of the laminated composites.