The role of localized energy dissipation

The enhancement of joint strength that may result from increasing the rugosity of the substrate surface, as detailed above, for example, by Packham and co-workers, need not necessarily arise either from a mechanical interlocking mechanism, or indeed from an increase in surface area for bonding or from 

Voyutskii [30-32] is the chief advocate of the diffusion theory of adhesion which states that the intrinsic adhesion of polymers to themselves (autohesion), and to each other, is due to mutual diffusion of polymer molecules across the interface. This requires that the macromolecules, or chain segments of the polymers (adhesive and substrate) possess sufficient mobility and are mutually soluble. This latter requirement may be restated by the condition that they 

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