Adhesive Bonding: Materials, Applications and Technology by Walter Brockmann

Chemical Engineering

By Walter Brockmann

Either sturdy wisdom of the fundamentals in addition to professional wisdom is required to create inflexible, long-lasting and material-specific adhesions within the business or alternate sectors. info that's tremendous tough and time-consuming to discover within the present literature. Written by means of experts in numerous disciplines from either academia and undefined, this guide is the first actual to supply such entire wisdom in a compact and well-structured shape. along such conventional fields because the homes, chemistry and attribute habit of adhesives and adhesive joints, it additionally treats intimately present sensible questions and the manifold purposes for adhesives.

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Wenzel’s roughness factor is defined as the ratio of the true area of a surface (actually present on the microstructure of a surface) to the geometrically projected area. The aim of these calculations was to deduce the strength of adhesive assemblies from the work of adhesion. This is possible as long as there is no mixing of the substances during the wetting process – that is, there are no penetration or chemical interactions that would resulting in a reversibility of the wetting process. In this case, the work necessary to separate the two materials after wetting is equal to that liberated during the wetting process.

Remarkable among de Bruyne’s concepts was that he used a combination of different polymer systems that previously had been used systematically only in pressuresensitive adhesives. Another name of historical value in the field of epoxy resins is that of ‘Araldit’ (CIBA). This was the merit of Eduard Preiswerk who, in 1944, discovered that epoxy resins cured with phthalic anhydride, produced synthetically by Pierre Castan in 1937, offered a wide variety of possibilities to create bonded joints, even between metals [8].

These interfacial tensions (or energies) thermodynamically determine the angle of contact. When the drop of liquid is at rest, there is equilibrium between the interfacial tensions. Only if a is 90 or less can a sufficiently intimate molecular or atomic contact (see above) be created, and this results in adhesion between the wetting liquid and the solid-state material, which can be utilized in technical terms. This condition is only fulfilled if the interfacial energy between the solid-state material and the environment is equal to or higher than that between the liquid drop and the environment.

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