M. Murahara et M. Okoshi, PHOTOCHEMICAL SURFACE MODIFICATION OF POLYPROPYLENE FOR ADHESION ENHANCEMENT BY USING AN EXCIMER-LASER, Journal of adhesion science and technology, 9(12), 1995, pp. 1593-1599
Polypropylene (PP) surface in water was photochemically modified to re
nder it hydrophilic using ArF excimer laser radiation. The chemical st
ability of PP is attributed to the C-H and C-H-3 bonds present. Thus,
it is considered that H atoms are selectively pulled out from the area
irradiated with ArF excimer laser light and are replaced with OH func
tional groups in the presence of water. In this treatment, the irradia
ted sample becomes hydrophilic with enhanced adhesion properties. The
experimental conditions for this surface treatment were ArF laser flue
nce of 12.5 mJ/cm(2) and a shot number of 10000. The treated PP and st
ainless steel were bonded with epoxy adhesive and the tensile shear st
rength was 46 kg/cm(2).