13 September 2006 Polymer modified sol-gel materials for photochromic applications
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The chromophoric materials were prepared by copolymerization of various methacrylic monomers. The incorporation of the chromophore groups was done by coupling reaction of diazonium salts of the sulfonamide such as: sulfomethazine or sulfisomidine). The copolymers having free OH groups were able to react with 3-triethoxypropyl isocyanate forming intermediates used to prepare hybrid transparent films by sol-gel technique. The films of both copolymers as well as of hybrid sol-gel structures showed photochromic properties via trans-cis isomerization of the diazo groups. The absorption maximum of the trans form was ca. 435-445 nm depending on chemical composition of the material. Illumination of the films with coherent laser beams (two-beam coupling) resulted in formation of diffraction grating. The diffraction efficiency reached 4-5 % and refractive index modulation was in the range up to 0.0032.
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Ryszard Janik, Ryszard Janik, Stanislaw Kucharski, Stanislaw Kucharski, } "Polymer modified sol-gel materials for photochromic applications", Proc. SPIE 6335, Organic Holographic Materials and Applications IV, 63350O (13 September 2006); doi: 10.1117/12.680055; https://doi.org/10.1117/12.680055

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