Abstract
An epoxy resin (diglycidyl ether of bisphenol A cured with piperidine) containing 0 or 15% rubber toughening agent has been bonded to steel and copper, and the adhesion measured by calculating the critical strain energy release rate Gc, from single edge notched and tapered double cantilever beam specimens. The metals were pretreated to give either a conventional surface or a microfibrous oxide layer on the substrate. With steel, low values of Gc were obtained with the microfibrous surface caused by failure between oxide and base metal. The microfibrous surface on copper gave tougher joints with the unmodified resin. With the toughened resin, lower values of Gc were obtained than expected as the copper interferes with the development of the desired phase structure of the resin.
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