SURFACE EFFECTS IN THE PHOTODEGRADATION OF POLYMER FILMS.
NAVAL RESEARCH LAB WASHINGTON D C
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The effect of ultraviolet irradiation in air on the wettability of polymer surfaces by liquids of known surface tensions was studied. The polymers studied were polystyrene, polyvinyl chloride, polyethylene terephthalate, polymethyl methacrylate, and polybutyl methacrylate. Changes in contact angles of the contact liquids used were plotted versus the time of irradiation of the polymer surface. Spectral evidence is presented to show that photodegradation products include oxygenated moieties capable of interaction with polar liquids. Polymer fragments resulting from chain scission also play an important role in wettability changes for some polymers. Extraction and spectral studies of irradiated polystyrene surfaces showed that photodegradation products include small molecules, readily removed by extraction, and oxidized as carbonyl polymer chains which are not readily removed from the surface. Author
- Radiation and Nuclear Chemistry
- Coatings, Colorants and Finishes