Effect of Phosphate-Bridged Monomer on Thermal Oxidative Behavior of Phthalonitrile Thermosets

Lobanova, M.S.; Babkin, A.V.; Kepman, A.V.; Avdeev, V.V.; Morozov, O.S.; Bulgakov, B.A.

Авторы: Lobanova Marina Sergeevna, Babkin Alexandr Vladimirovich, Kepman Alexey Valeryevich, Avdeev Victor Vasil’evich, Morozov Oleg Sergeevich, Bulgakov Boris Anatol’evich
Журнал: Polymers
Том: 16
Номер: 16
Год издания: 2024
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 2239
Последняя страница: 2239
DOI: 10.3390/polym16162239
Аннотация: Phthalonitrile thermosets are known for their excellent mechanical, physico-chemical, and fire-retardant properties, making them attractive for aerospace and mechanical engineering applications. When producing and applying phthalonitrile-based structural parts, it is essential to consider aspects such as processability and the long-term stability of the material’s properties at high temperatures. In our previous studies, we demonstrated that resins containing phosphate-bridged bisphthalonitrile monomers are easily processable due to their low melting temperature and wide processing window. In this study, we investigated the impact of bis(3-(3,4-dicyanophenoxy)phenyl)phenyl phosphate (PPhPN) monomer content on physico-chemical and mechanical properties, thermal stability, and thermal oxidative stability. This research highlights the importance of conducting long-term thermal oxidative aging studies in addition to thermogravimetric analysis to properly assess the stability of thermosets. The findings indicate that adding less than 15% of PPhPN results in the formation of a crystalline phase, which impairs the resin’s processability. Conversely, a high PPhPN content reduces the material’s thermal oxidative stability. Therefore, based on mechanical and physico-chemical tests after thermal oxidative aging, it can be concluded that a 10–15% concentration of the phosphate-containing monomer enables easy processability of the phthalonitrile resin and provides excellent long-term thermal oxidative stability at temperatures up to 300 °C, while maintaining a flexural strength exceeding 120 MPa and an elasticity modulus of 4.3 GPa.
Добавил в систему: Морозов Олег Сергеевич

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Effect of Phosphate-Bridged Monomer on Thermal Oxidative Behavior of Phthalonitrile Thermosetsстатья

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