Performance and Mechanisms of Hindered Amine Light Stabilizer in Spirooxazine Photostabilization

One of the key requirements for optical switching apertures for ophtalmic, building and automobile glazing is long lived product. However, oxidation of a spirooxazine yields photoproducts such as oxindoie derivatives, naphthoxazole, dihydro-2,6-quinolone and 1-N-formylimino-2-naphthoquinone devoid o...

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Published in:Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 1997-05, Vol.298 (1), p.61-68
Main Authors: Salemi-Delvaux, C., Campredon, M., Giusti, G., Guglielme'iti, R.
Format: Article
Language:English
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Summary:One of the key requirements for optical switching apertures for ophtalmic, building and automobile glazing is long lived product. However, oxidation of a spirooxazine yields photoproducts such as oxindoie derivatives, naphthoxazole, dihydro-2,6-quinolone and 1-N-formylimino-2-naphthoquinone devoid of photochromic activity, and limits the commercialisation of these useful systems. Achieving this long lived product can be provide by use of hindered amine light stabilizers (HALS). This paper describs the comportment of a spirooxazine irradiated in the presence of a HALS and the main stabilization mechanisms are discussed.
ISSN:1058-725X
DOI:10.1080/10587259708036143