Study of the degradation of polyurethanes. III. Mechanism of the photodegradation of polyurethane

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Published
1977-02
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  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/pol.1977.170150219
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Wiley

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<jats:title>Abstract</jats:title><jats:p>The effect of triplet sensitizers, benzophenone and anthraquinone and metal acetylacetonates [Co(II, III), Cu, Sn, and Ni] on the photodegradation of polyurethane was examined. Ultravioletvisible (UV‐V) absorption spectra, gel formation, and luminescence emission of the polymer before and after irradiation were measured. Changes in UV‐V absorption of the polymer and the formation of an insoluble fraction in the polymer were accelerated in the presence of the triplet sensitizers, and (Co(II, III)), Cu, and Sn acetylacetonates. Unirradiated polyurethane was excited by irradiation at 290 and 346 nm, and emitted light at 310 and 420 nm. After 1/2 hr irradiation emission of luminescence was observed at 430 nm, excitation at 290 and 346 nm; after 2hr irradiation at 530 nm, excitation at 420 nm was observed. The results suggest that photodegradation of the polyurethane proceeds via excited triplet states forming excimer between the polymers at the initial stage and exciplexes between the polymer and degradation products or intermediates after a certain irradiation.</jats:p>

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