The researches of the last decades have demonstrated that among the materials with photothermoplastic
properties it shows carbazolic polymers. In the case of these polymers materials,
for registration of information in visible field, it is enough to coordinate the carbazolic nucleus,
as a donor, with an agent-acceptor, such as iodoform, trinitro- or tetranitrofluorenone [1].
In order to achieve a successful in optimal structure designing of carbazolic polymers, which
must meet a set of properties (photosensitivity, transparency, plasticity, adhesion to substrate),
the relationship between structure and their properties in making the structural verti-cally
variation as well as horizontally, were studied. Vertically, the distance varied between the
carbazolic nucleus and polymeric chain, using for polymerization monomers in which the
distance is increased from carbazolic nitrogen to fragment with the double bond: Nvinylcarbazol,
N-carbazolylmet-hylacrylat, N-carbazolylethylmethacrylat, Ncarbazolylethoxiethylmethacrylat.
The horizontal changes were done by copolimerization of
carbazolic monomer with alkyl-acrylaţs [2]. At the same time, the substitutes were introduced in
the therd pozition of the carbazolic nucleus, for example:
Carbazol ->N-Hydroximethyilcarbazol -> 3-Y-N-Hydroximethylcarbazol ->3-Y-N-carbazolyl-methylacrylat -> macromolecular product, where Y = Br, NO2
The study of materials demonstrated that the introduction of bromine atom increases the
photosensitivity of the polymer by about 8 percent, while the nitrogroup has a light influence.
But optimization of nitrocopolymer synthesis route is of interest from the perspective of NO2
group reducing into aminoderivatives, capable to graft with biologically active compounds or
medicinal preparations. Cycling of the reactions has been shown using thin-layer chromatography,
and products structures have been confirmed by IR, 13C NMR spectroscopy and
chroma-tography on G-L HPC methods.
References:
1. Mailhot B., Robu Ș. et all. Carbazole containing copolymers: synthesis, characterisation and
application in reversible holographic recording. //Polymers for advanced Technologies. Art. ID
945242, 2010, p. 131-140.
2. Dragalina G., Robu S., Popusoi A., Culeac I., Derives carbazoliques pour l’elaboration des
materiaux photosensibles, 2-eme Colloque Franco-Roumain de Chimie Medicinale – CoFrRo- CM
- 2012, october 03-05 2012, Iasi, Romania, p.22.