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where X=NH, O, S
Further Krasovitskiy and his research workers [122] obtained a number of derivatives of
naphthoilenbenzimidazoles both for structurally - dyed polymers and for mass dyeing.
Unfortunately, because of low thermal stability a great number of these dyes found their
application for dyeing polyolefines and polystyrenes and in the case of bath dyeing for PA.
But despite this interest in them, and first of all from the point of view of practical use of
luminophors, does not fall. And of course their relative accessibility plays unimportant role.
Aroilenbenzimidazoles are of great interest, since they are not only compounds modelling
structure of “staircase” polymers - polyaroilenbenzimidazoles [123] at different stages of
their synthesis, but potential monomers for synthesis of different thermostable polymers,
containing phthalimide side-groups [124], copolyaroilenbenzimidazoles of asymmetric
structure [125], and also may be dyes for fibre-forming polymers [126, 127], improving their
light- and thermal stability. Proceeding from this it was necessary to investigate spectra of
luminescence and thermal properties and also their compatibility with PCA melt.
Compounds, presented in Table 1, were synthesized on the basis of two-nucleus bis-(0 -
nitroamines):3,3 - dinitrobenzidine, 3,3 - dinitro - 4, 4 - diamino - diphenyloxide, 3,3 -
dinitro - 4,4 - diamino - diphenylmethane. Transformation of bis(0 - dinitroanilines) intro bis
(3 - amino - 4 - phthalimido) - arylenes and definite bis - (1,8 - benzollene - 1,2 -
benzimidazoles - 1,2 - benzimidazoles - was carried out according to the following scheme
[127]:
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