| Autor: |
Lobanova MS; Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia., Babkin AV; Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia., Kepman AV; Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia., Avdeev VV; Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia., Morozov OS; Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia., Bulgakov BA; Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia. |
| Jazyk: |
angličtina |
| Zdroj: |
Polymers [Polymers (Basel)] 2024 Aug 07; Vol. 16 (16). Date of Electronic Publication: 2024 Aug 07. |
| DOI: |
10.3390/polym16162239 |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
|
Nepřihlášeným uživatelům se plný text nezobrazuje |
K zobrazení výsledku je třeba se přihlásit.
|
