
%0 Journal Article
%A Dux, R 
%A Ghiggino, KP 
%A Vogl, O 
%T Photochemical Processes in a Copolymer of 2-(2'-Hydroxy-4'-methacryloyloxyphenyl)-2H-benzotriazole and Methyl Methacrylate
%J Australian Journal of Chemistry
%D 1994/08/01
%V 47
%N 8
%P 1461-1467
%K 
%R https://doi.org/10.1071/CH9941461
%U https://www.publish.csiro.au/paper/CH9941461 
%X The temperature-dependent (10-300 K) fluorescence behaviour of films of a copolymer of 2-(2&#8242;-hydroxy-4&#8242;-methacryloyloxyphenyl)-2H-benzotriazole and methyl methacrylate (HMPB-co-MMA) has been studied. The emission spectra consist of a short-wavelength band and a highly Stokes-shifted emission with maxima at 390 and 550 nm respectively. The temperature- insensitive 390 nm emission is assigned to a non- intramolecular hydrogen-bonded form of HMPB while the red-shifted emission is due to the species formed following excited-state intramolecular proton transfer. The temperature dependence of the 550 nm fluorescence is complex and does not allow a linear Arrhenius plot. Possible mechanisms for the temperature-dependent deactivation processes are proposed. Irradiation studies indicate that the non-planar HMPB entities are more photolabile than the intramolecularly hydrogen-bonded form. The relevance of the results to the application of HMPB as an ultraviolet absorber and photostabilizer in polymers is discussed. 
