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Autori: E. C. Buruiana, M. Olaru, B. C. Simionescu
Editorial: J. Appl. Polym. Sci., 94, p.2324-2332 , 2004.
New polymeric photobase generators containing oxime–urethane groups were prepared by the polyaddition reaction of 2,4-tolylene diisocyanate with terephthalaldehyde dioxime in the presence or absence of a polyol
component to study the ability of these polymers to generate amines through the photolysis of oxime–urethane linkage.
The amines induced the crosslinking of poly(glycidyl methacrylate), as proved by the variation of the amount of
the insoluble fraction of polymer films with the heating temperature and/or irradiation time. UV and IR absorption spectra indicated that the thermal crosslinking of poly(glycidyl
methacrylate) was catalyzed by the photogenerated amines. The photobehavior of the polymers was followed by a reduction of the absorption band at 290 nm, which was
characteristic of oxime–urethane groups, as a function of the
UV irradiation time. Blue fluorescence was visualized by the treatment of irradiated films with fluorescamine.
Cuvinte cheie: polyurethanes