Photosensitive Carbazolylethylmethacrylate Copolymers on Flexible Substrate for Optical Information Registration

This report present results of study of some organic materials suitable for creation of photothermoplastic media (on flexible base) for optical information recording. In particular, speech is about donor-acceptor systems on the base of carbazolyl containing polymers, in particular, carbzolylethylmethacrylates (CEM) with oktylmethacrylates (OMA) and polyepoxypropylcarbazolyl (PEPC) copolymers sensibilization of which was made by means of 5-20% of trinitrofluorenone (TNF), N-fenylamino-2,4,7-trinitrofluorenone (FNF) and ditianomethylen-2,4,7-trinitrofluorenone (DTF) (containing donor-acceptor group) and additives of photochromic substances of indolynospirobenspyran series. There were studied the dependencies of photosensitivity on sensibilizer's concentration and temperature of heating of polymeric material and also the spectral diapason of photosensitivity. It was established that maximum of photosensitivity is observed at the concentration of sensibilizing agent 12-14%. Heating above 60°C leads to sharp decrease of photosensitivity of developed organic materials. It was established that donor-acceptor systems as photoplastic layers possess photosensitivity on the level 10 −3 -10 −4 J/cm 2 . The introduction of PP layers of 6-10% photochromic additives leads to 2-3 times increasing of the photosensitivity of the given donor- acceptor system. At that the essential growth of photosensitivity is observed in the blue-green part of visible spectrum. Also, it was established that 8'-nitro-1,3,3- trimethylindolynospirobenzopyrane possess the greatest effect of sensibilization. The fact that adsorption band (500-600 nm) is in the visible part of spectrum confirms the amplification of concentration of donor-acceptor group in PP layers and, as result, considerable growth of photosensitivity. The received results are discussed. Thus, donor-acceptor systems, developed on the base of photopolymer CEM:OMA, demonstrate photosensitivity of 10 −6 J/cm 2 . at 80-85°C that 2-3 times higher than in case of usual donor-acceptor systems.