Characterization of modifications of polymer surfaces after excimer laser treatments below the ablation threshold

The modifications induced by excimer laser radiation on different types of polymer surfaces (polyether-etherketone (PEEK), polycarbonate (PC) and epox y resin) performed at laser fluences below the material ablation threshold have been investigated. Particular attention was given to the role of laser irradiation wavelength (193 or 248 nm) on the nature and properties of the treated surfaces. Results indicate that a much stronger reactivity was obt ained after treatments at 193 nm for all the investigated polymers. At this wavelength, the original polymer surfaces are strongly modified by UV phot ons; surface reorganization occurs and polar groups induce an increase in t he surface wettability. (C) 2000 Elsevier Science B.V. All rights reserved.