Abstract
The contemporary view is that mechanical interlocking plays a part in adhesion in certain cases, such as to porous anodic films on aluminium. The concept can be traced back to 1925 when McBain and Hopkins put forward the idea of ‘mechanical adhesion’ to such substrates as wood, charcoal and porous pottery. Their ideas were later dismissed by many as being mistaken. Now that other cases of mechanical adhesion are again postulated, it is of interest to ask whether McBain and Hopkins were right in the examples they quoted. In attempting to answer this question, on experimental study has been conducted.of the adhesion of polyethylene to unglazed clay ceramic fired so as to give different porositie At high firing temperatures, the ceramic is relatively non-porous, and failure occurs within the polymer giving a high peel strength. For low firing temperatures, the polyethylene enters the pores on the ceramic surface and, as a consequence, failure occurs within the relatively weak ceramic.
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