Abstract
The possibility of chemical modification of thermally-stable functional copolymers of 1-vinyl-1,2,4-triazole with vinyl acetate of various compositions synthesized under conditions of free-radical polymerisation in the presence of azobisisobutyronitrile was studied. Modification of the copolymers was carried out by alkaline hydrolysis; as a result, new copolymers containing vinyl triazole and vinyl alcohol units in the macromolecules were obtained. The structure, composition, physical and chemical properties of the copolymers were determined using elemental analysis, infrared spectroscopy and thermogravimetric analysis. With an increase in the number of vinyl alcohol units in the copolymer from 25 to 87 mol %, a nearly twofold reduction in the intrinsic viscosity of the copolymers was observed. The copolymers, which exhibit dielectric properties, are characterised by electrical conductivity of the order of Ш 14-10-15 S/cm. According to thermogravimetric analysis data, the copolymers are resistant to thermooxidative degradation up to 270-290 °C depending on the composition. The introduction of a vinyl alcohol fragment into the structure of copolymer macromolecules contributed to the improvement of their fibre- and film-forming properties - that is, fibres and transparent elastic films with good adhesion to various metal surfaces can be formed from solutions of modified copolymers based on 1-vinyl-1,2,4-triazole.
Highlights
N-vinylazoles and vinyl acetate are promising monomers for the development of new polymer materials having special physical and mechanical parameters and a wide range of valuable properties [1–13]
The radical copolymerisation of 1-vinyl1,2,4-triazole with vinyl acetate have previously been successfully used for synthesising new functional copolymers of various compositions with triazole and acetate fragments in macromolecules, which have demonstrated good solubility, high thermal stability, as well as dielectric and stabilising propertie [14–17]
Copolymers of various compositions (73:27, 47:53, and 13:87 mol %) were obtained in the form of light-yellow powders that were soluble in water, DMSO and DMF
Summary
N-vinylazoles and vinyl acetate are promising monomers for the development of new polymer materials having special physical and mechanical parameters and a wide range of valuable properties [1–13]. For citation: Prozorova GF, Kuznetsova NP, Korzhova SA Chemical modification of functional copolymers. Для цитирования: Прозорова Г.Ф., Кузнецова Н.П., Коржова С.А.
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