UV STUDY ON THE THERMAL-STABILITY OF DISPERSE-RED-1 FILMS INCORPORATED WITH REACTIVE SILICA

The thermal stability of thin DR1/PMMA, DR1/silica, and DRS/silica sys tems was studied by UV spectroscopy. DRS which can covalently bind wit h reactive silica was synthesized between 4-[ethyl(2-hydroxyethyl) ami no]-4'-nitro azobenzene (disperse red 1, DR1) and 3-isocyanatopropyl t riethoxy silane. The characterization of chemicals and incorporated fi lms were carried out by UV/VIS spectroscopy, DTA, H-1- and C-13-NMR, a nd FT-IR. After poling of DR1 and DRS incorporated at various temperat ures, the UV absorbance decreased due to the alignment of DR1 and DRS by electric field. The second harmonic generation response was obtaine d by using Nd:YAG laser. The thermal stability of DRS and DRS/silica s ystem was enhanced, compared to that of DR1 and DR1/silica system, res pectively.