ABSTRACT

Now, because the adhesive strength is practically defined as the breaking strength of the composite system of adherends and adhesive, the value is dependent not only on the physicochemical properties of the surface (critical surface energy, surface tension, surface irregularity, etc.), but also on the structure/properties of the two bulk materials (molecular structure, molecular-weight distribution, co-polymer composition, graft/block, crosslinking, phase structure. morphology near the boundary surfaces, mechanical properties, thermal expansion coefficient. etc.). And it is true that the apparent adhesive strength is different if a differem method of testing is employed, even for the same combination of

FIGURE 1 Failure modes of adhesive joints.