Photo-oxidation of Poly(butylene adipate-co-terephthalate) Film Using UV/Ozone Irradiation

Biodegradable poly(butylene adipate-co-terephthalate) (PBAT) film was modified by UV/ozone irradiation. The surface properties of the irradiated PBAT were characterized by surface roughness, contact angles, ESCA, and ATR analyses. The UV/ozone treatment uniformly roughened the film surface, where the maximum surface roughness of the unirradiated sample increased from 74 nm to 239 nm with UV energy of 15.9 J/cm2. The modified PBAT became more hydrophilic as indicated by lower water contact angles of 10 o compared to the 72 o of the unirradiated PBAT. In addition, surface energy increased from 44.8 mJ/m2 for the unirradiated PBAT to 50.1 mJ/m2 with a larger UV energy of up to 15.9 J/cm2. In addition, the improvement in hydrophilicity was caused by the introduction of polar groups containing oxygen bonds such as C-O and C=O resulting in higher O1s/ C1s, which in turn resulted in a higher dyeability of the modified film to a cationic dye. The increased dyeability may have resulted from the photochemically introduced anionic and dipolar dyeing sites on the photo-oxidized PBAT surface.

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Photo-oxidation of Poly(butylene adipate-co-terephthalate) Film Using UV/Ozone Irradiation

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