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Poly(butylene terephthalate)(PBT) surface was modified by UV/ozone irradiation and the effect of UV energy on the surface properties of the irradiated PBT films were characterized by the reflectance, surface roughness, contact angles, ESCA, and ATR analyses of the film surface. The surface reflectance, at the short wavelength of visible spectrum of particularly 400nm, decreased with increasing UV energy. And the irradiation roughened the film surface uniformly in the nano scale. The maximum surface roughness increased from 110nm for the unirradiated sample to 303nm at the UV energy of . The surface energy of PBT film increased from for the unirradiated PBT to at the irradiation of . The improvement in hydrophilicity was caused by the introduction of polar groups containing oxygens such as C-O and C

Surface Photooxidation of Poly(butylene terephthalate) Films by UV/Ozone Irradiation