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Authors
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Gao, S.-L. ; Häßler, R. ; Mäder, E. ; Bahners, T. ; Opwis, K. ; Schollmeyer, E.
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Title
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Photochemical surface modification of PET by excimer UV lamp irradiation
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Date
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14.10.2005
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Number
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12797
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Abstract
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UV irradiation has interesting potential for the photochemical modification of polymers. In order to study cross-linking effects and/or thin-layer deposition following a treatment in the presence of bi-functional media or in inert atmosphere, irradiation of PET in various atmospheres was performed using a KrCl excimer lamp. Surface properties were investigated by atomic force microscopy, nanoindentation, micro-thermal analysis, and X-ray photo-electron spectroscopy. The studies reveal that surface chemical composition, morphology, adhesion, thermomechanics, and stiffness/modulus are strongly affected by UV irradiation in the presence of bi-functional media. Films treated in octadiene and argon show an increase of surface modulus, much less expansion, and lower soft/melt temperatures, which is an indication of the surface cross-linking effect and a decrease of crystallinity within the near-surface layer. In the case of a diallylphthalate-treated film, depending on the local structure, either a strong decrease of melting temperature or no melting point is found, which is attributed to the irregular cross linking and thickness of the modified layer associated with a decrease of surface modulus. A significant increase of the alkali resistance is found after irradiation, as a result of both wetting and cross-linking effects on the polymer surface.
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Publisher
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Applied Physics / B
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Wikidata
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Citation
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Applied Physics / B 81 (2005) 681-690
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DOI
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https://doi.org/10.1007/s00340-005-1928-9
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