Interlock bonding

The above-mentioned directed synthesis always requires a certain strong interaction between the wheel and the axle before making the interlocked bond in any method. As for the example of the wheels depicted in Scheme 3, hydrophobic interaction is the major attractive interaction in the cases of cucurbituril and cyclodextrin (A, B), thereby resulting in limitation as the wheel-axle complex formation should be done in water. In particular, it is an additional difficulty to employ the complexation in strongly acidic conditions owing to the extremely low solubility of cucurbituril. 

V, Interlocking bonds. Fibers as well as flat (lamellar) and bulky materials can interlock or weave and fold about each other. Such interlocking or form-closed bonding occurs only infrequently in disperse particle systems because the shape of their elements does not meet the above requirements. To obtain this type of bond, compression and shear forces must always act on the system. The strength of the resulting agglomerate depends only on the type of interaction and the material characteristics. 

The influence of fibers on the strength, structure, and characteristics of agglomerates was discussed in Section 5.1.2. The binding mechanism interlocking bonds (see Section 5.1.1), the intertwining of fibers and threads, is also used directly to produce agglomerates by producing non-wovens, felts, filters, webs, paper, etc. 

So far in this book, the binding mechanism V interlocking bonds (Tab. 3.1, Chapter 3) has been mentioned in connection with the sometimes heat-induced plastic deformation during press agglomeration (Section 6.6.2) and the application of fibers for the reinforcement of agglomerates (Section 8.2) and for assisting disintegration of... 

By the mechanical bonding of unevenness in the joint surface (interlock bonding)... 

At the time that this work was carried out, the existence of the smear layer was not known. It was, however, obvious that the acid-etch process was critical to successful bonding and that it involved the development of a surface to which bonding could occur. The concentration of the phosphoric acid was critical, too. The apparently arbitrary concentration of 37% lies halfWay between 25%, which was too dilute to be effective, and 50%, which is so concentrated that it removes too much tooth material, and does not result in the formation of a satisfactory interlock bond. 

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