By A. J. Kinloch (auth.)
Over the decade, or so, the expansion within the use of adhesives, particularly in ever extra technically hard purposes, has been speedy and lots of significant advancements within the know-how of adhesives were suggested. This progress has additionally resulted in awareness being excited about a bit extra simple reviews of the technology of adhesion and adhesives, and lately our point of basic wisdom in regards to the formation and mechanical functionality of adhesive joints has elevated dramatically. Such experiences have, after all, been aided significantly by way of the advance of the instruments on the disposal of the investigators. for instance, particular floor analytical options, akin to X-ray photoelectron and secondary-ion mass spectroscopy, and the more and more subtle equipment of tension research and fracture mechanics were positioned to solid use in furthering our realizing of the technological know-how of adhesion and adhesives. the current ebook makes an attempt to check the multidisciplined topic of adhesion and adhesives, contemplating either the technology and expertise inquisitive about the formation and mechanical functionality of adhesive joints. the writer wish to thank his pals and co-workers for necessary discus sions and assist in the guidance of this publication. i'm relatively thankful to P. Cawley, J. Comyn, W. A. Lees, A. C. Roulin-Moloney, W. C. Wake, J. G. Williams and R. J. younger who've learn and commented on a variety of chapters and P. Farr for getting ready the diagrams.
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Additional info for Adhesion and Adhesives: Science and Technology
Other, more sophisticated models of substrate surface topography have since been developed [17-19,21-26] to explain features such as contact angle hysteresis. These models have led to the Wenzel relationship being re-examined and Hitchcock et al. g. an abraded surface. They found that an empirical relationship existed between the enthalpy of a liquid and the extent to which its wetting behaviour was altered by substrate roughening. This enabled theoretical predictions to be made about the behaviour of liquids.
It appears that, providing the liquid series chosen can interact with the solid surface in a similar way to the adhesive of interest, then the values of yp and y; are of considerable help in adhesives technology, as will be shown later. 4 Donor-acceptor interactions It is some 60 years ago that Lewis  proposed that bases are electron donors and acids are electron acceptors. More recently, Fowkes and 'co-workers [79-83] have treated hydrogen bonds as a subset of Lewis acid-base interactions and suggested that interfacial acid-base bonds between the adhesive and the substrate may often playa key role in adhesives technology.
6 Dynamic contact angle, 8d, versus the hquid viscosity, TJ . 3 The influence of surface roughness The roughness of the substrate surface may also influence the kinetics of wetting. Firstly, a liquid forming a contact angle of less than 90° with a solid surface may spread along fine pores, scratches and other inhomogeneities by capillary action, even though it will not spontaneously wet a planar surface. Bascom et al.  have reported that random surface scratches may increase the spreading rate of some liquids by as much as 50% and that open capillaries filled well ahead of the diffusional advance of the primary film.
Adhesion and Adhesives: Science and Technology by A. J. Kinloch (auth.)