Photosensitive Carbazolylethylmethacrylate Copolymers on Flexible Substrate for Optical Information Registration
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Photosensitive Carbazolylethylmethacrylate Copolymers on Flexible Substrate for Optical Information Registration 1
S.Robu, 2I. Dementiev, 3S.Dmitriev 1 Faculty of Chemistry, Moldova State University 2 Department of Physics, Moldova State University 3 Center of Applied and Environmental Chemistry, Moldova State University 60, A.Mateevici Str., Chisinau, MD-2009, Moldova
ABSTRACT
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 60oC 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/cm2. The introduction of PP layers of 6-10% photochromic additives leads to 2-3 times increasing of the photosensitivity of the given donoracceptor 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-1,3,3trimethylindolynospirobenzopyrane 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/cm2. at 80-85oC that 2-3 times higher than in case of usual donor-acceptor systems.
INTRODUCTION
In the last years the photothermoplastic media of information with photopolymeric (PP) layers on the base of organic photopolymers, sensibilized by different electron-acceptor doppants or dyes, have found wide application [1,2]. Although PP media possess sufficiently high
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resolving capacity and high photographic contrast [3] they, however, are characterized by the low photographic sensitivity, especially in the visible part of spectrum. In this connection, in the current work there are presented results of investigations directed on the sensibilization of PP on the base of polyepoxypropilcarbazole (PEPC)
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