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Poly ketone (PK) was photo-oxidized by UV/ozone irradiation and the effect of UV energy on the surfaceproperties of the UV-irradiated PK film was investigated by th e measurement of reflectance , surface roughness, contactangles, ESCA, and ATR. Reflectance, particularly at the wav elength of 380nm, decreased with increasing UV energy. Andthe irradiation produced nano-scale roughness on the surface uniformly. The maximum surface roughness increased from25.3nm for the unirradiated sample to 104.9nm at the irradiation of 42.4J/cm². The improvement in hydrophilicity was causedby the introduction of polar groups such as C-O and C=O bonds resulting in higher O 1s /C 1s . The surface energy of PK filmincreased from 43.3 mJ/m² for the unirradiated sample to 71.9 mJ/m² at the irradiation of 31.8J/cm². The zeta potential ofthe UV-irradiated PK decreased with increased UV energy and the dyeability to cationic dyes increased accordingly, resultingfrom the photochemically introduced anionic and dipolar dyeing sites on the PK films surfaces.

Photo-oxidation and Dyeability of Poly Ketone by UV/O3Irradiation

Photo-oxidation and Dyeability of Poly Ketone by UV/O₃Irradiation