Read e-book online Adhesive Bonding: Materials, Applications and Technology PDF

By Walter Brockmann

ISBN-10: 3527318984

ISBN-13: 9783527318988

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

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Extra info for Adhesive Bonding: Materials, Applications and Technology

Example text

This is the reason that, as long as no acid rain penetrates the system, there is a good resistance of adhesion between concrete and Monier steel. 5, the oxide will be allowed to hydrate, and the result will be destruction of the adhesion. In fact, this is the most important reason why long-term damage has frequently been observed in concrete structures. 3 Adhesion in Real Systems The standard adhesion theories described above often do not allow predictions to be made of the actual behavior and failure of adhesive bonded joints.

The formation of chemical interactions may be enhanced by surface pretreatment, the use of adhesion promoters, and with specific formulations of adhesives. Chemical interactions modify the nature of the adhesive and the adherent surfaces, respectively, near the interface. This may have positive effects on the water resistance of adhesive assemblies, for example by the stabilization of metal oxides as a result of chemical reactions, or by modification of the polymer dynamics within the adhesive near the interface.

Presumably, the heat of adsorption supplies the activation energy necessary to launch the formation of chemical bonds. Since virtually no other energy sources are available when an adhesive is applied, chemisorption or chemical adhesion first requires an exothermic adsorption. In fact, while adsorption takes place rather rapidly (requiring only a few minutes), chemisorption takes longer (between 20 min and 1 h) [3]. As the energy required to separate chemical bonds is considerably higher than the physical bonding energy, the heat produced during further adsorption is not adequate to separate the chemical bonds, and this explains why chemisorbed quantities may not be desorbed according to Langmuir’s adsorption theory [18].

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Adhesive Bonding: Materials, Applications and Technology by Walter Brockmann


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