
9: TRIAZOLE POLYMERS 231
The adhesion strength of epoxyresin copper joints is
often very poor. This is caused by the naturally formed
copper oxide having a low mechanical strength. In
order to improve the adhesion strength of such joints,
copper lead frames were created with azole com-
pounds as adhesion promoters. The azole compounds
used are benzotriazole (CBTA) and other non triazolic
classes [74].
Triazole compounds, such as CBTA and 8-
azaadenine, showed excellent adhesion strength,
whereas imidazole-based azole compounds did not
improve the adhesion strength. However, the adhe-
sion strength of CBTA and 8-azaadenine-treated joints
decreased with increasing ...