자외선/오존 조사에 의한 Poly(butylene succinate) 필름의 광산화
Photooxidation of Poly(butylene succinate) Films by UV/Ozone Irradiation
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초록
Biodegradable Poly(butylene succinate), PBS, was photooxidized by UV/ozone irradiation and the effect ofUV energy on the surface properties of the UV-irradiated PBS film were investigated by the measurement of reflectance,surface roughness, contact angles, chemical composition, and zeta potential. With increasing UV energy, reflectancedecreased in the visible and ultraviolet regions particularly at the wavelength of 380nm. The irradiation producednano-scale surface roughness including the maximum peak-to-valley roughness increased from 106nm for the unirradiatedsample to 221nm at the UV energy of 10.6J/cm². The improved hydrophilicity was due to the higher O1s/C1s resultingfrom the introduction of polar groups such as C-O and C=O bonds. The surface energy of the PBS increased from42.1mJ/m² for the unirradiated PBS to 56.8mJ/m² at the irradiation of 21.2J/cm². The zeta potentials of the UV-irradiatedPBS also decreased proportionally with increasing UV energy. The cationic dyeability of the PBS increased accordinglyresulting from the improved affinity of the irradiated PBS surfaces containing photochemically introduced anionic anddipolar dyeing sites.
Abstract
Biodegradable Poly(butylene succinate), PBS, was photooxidized by UV/ozone irradiation and the effect ofUV energy on the surface properties of the UV-irradiated PBS film were investigated by the measurement of reflectance,surface roughness, contact angles, chemical composition, and zeta potential. With increasing UV energy, reflectancedecreased in the visible and ultraviolet regions particularly at the wavelength of 380nm. The irradiation producednano-scale surface roughness including the maximum peak-to-valley roughness increased from 106nm for the unirradiatedsample to 221nm at the UV energy of 10.6J/cm². The improved hydrophilicity was due to the higher O1s/C1s resultingfrom the introduction of polar groups such as C-O and C=O bonds. The surface energy of the PBS increased from42.1mJ/m² for the unirradiated PBS to 56.8mJ/m² at the irradiation of 21.2J/cm². The zeta potentials of the UV-irradiatedPBS also decreased proportionally with increasing UV energy. The cationic dyeability of the PBS increased accordinglyresulting from the improved affinity of the irradiated PBS surfaces containing photochemically introduced anionic anddipolar dyeing sites.
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