2018 (4) 6

https://doi.org/10.15407/polymerj.40.04.263

Synthesis and properties of azo-azomethine-containing core fluorinated polymer

A.I. Kovalchuk, Ya.L. Kobzar, I.M. Tkachenko, O.V. Shekera, V.V. Shevchenko

Institute of Macromolecular Chemistry NAS of Ukraine

48, Kharkivske shose, Kyiv, 02160, Ukraine

Polym. J., 2018, 40, no. 4: 263-269.

Section: Synthesis polymers.

Language: Russian.

Abstract:

The method of the synthesis of the first representative of azo-azomethine-containing fluorinated polymer is developed. The main peculiarity of the obtained polymer is the combination of azo- and azomethine groups within one conjugated unit, which is separated by an aliphatic spacer and a trafluor-1,4-oxyphenylene block. The synthesized polymer is characterized as well dissolved in ionic liquids, based on N,N–dialkylimidazolium salts, not dissolved in organic solvents and resistant to the acid and alkali impact.

The structural investigations have shown that azo-azomethine-containing fluorinated polymer has an amorphous crystalline structure, its degree of crystallinity makes up approximately 50%. It has been established that the investigated polymer is a thermostable polymer and its glass transition temperature does not emerge right up to 300 °С. The peculiarities of the photo-optical behavior of obtained polymer have been modeled and studied from the example of an azo-azomethine containing chromophore specimen. Its structure completely reflects the structure specificity of the repeated unit in the obtained polymer. It is shown that the synthesized azo-azomethine containing chromophore is characterized by high optical sensitivity and is able to perform photoisomerization under the influence of UV-irradiation. In doing so, the photostationary state for it comes after 30 sec of irradiation. The synthesized compounds are extremely interesting for creating the thermostable photo-active materials with nonlinear optical and liquid crystal properties.

Key words: perfluoroaromatic azo-azomethine-containing polymers, tetrafluorobenzene fragments, synthesis, structure, optical properties.

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Поступила в редакцию 4 июля 2018 г.