Surface modification pretreatment on the laser-bonded joint between a cyclic olefin polymer (COP) and
stainless steel (SUS304) was studied to determine its effect on improving the laser-bonded joint strength.
The joint strength between the surface-modified COP and SUS304 was significantly improved compared
with that of an equivalent un-treated joint. This improvement is caused by the generation of oxygen func-
tional groups on the COP surface resulting in the improved adhesion of these groups with the oxide film
formed on the SUS304 surface.