Thermal Behavior of Poly(acrylonitrile-co-1-vinyl imidazole) During Stabilization

Toms, R.V.; Gervald, A.Y.; Prokopov, N.I.; Osipova, N.I.; Plutalova, A.V.; Chernikova, E.V.

Авторы: Toms R.V., Gervald A.Yu, Prokopov N.I., Osipova N.I., Plutalova A.V., Chernikova E.V.
Журнал: Polymer Science, Series B
Год издания: 2022
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
DOI: 10.1134/s1560090422700099
Аннотация: Copolymers of acrylonitrile (AN) and 1-vinyl imidazole (VIM) are synthesized through free radical and reversible addition–fragmentation chain transfer (RAFT) polymerization in DMSO. It is demonstrated that reactivity of VIM in copolymerization is lower than that of AN (rVIM = 0.22 ± 0.02 and rAN = 0.88 ± 0.02). The copolymer composition is held constant throughout copolymerization in the range of monomerfeed up to 30 mol % of VIM providing the formation of copolymers with high compositional homogeneity.RAFT mechanism provides additionally the low dispersity of the copolymers. The study of thermal stabilization processes of the synthesized copolymers reveals that molecular weight distribution plays minor role in the thermal behavior of acrylonitrile copolymers with 1-vinyl imidazole in contrast to copolymer composition. The activation energy of cyclization reaction increases linearly with the increase of VIM content in copolymer. The increase of VIM molar part in the copolymer is followed by slower evolution of the ladder structure. Generally, VIM may be considered as an inert monomer. At a constant temperature, the rate of the formation of ladder structure under inert atmosphere and in air differs drastically. The conversion of nitrile groups in –C=N– groups equal to 10% is achieved after 2.5 h of thermal treatment in argon or in 15 min in air. The essential difference in the rates of cyclization reactions in argon and air allow to develop new strategy for production of melt-processable precursors of carbon fiber.
Добавил в систему: Черникова Елена Вячеславовна

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Thermal Behavior of Poly(acrylonitrile-co-1-vinyl imidazole) During Stabilizationстатья

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