Synthesis, curing and thermal properties of the low melting point phthalonitrile resins containing glycidyl groups

Two low melting point phthalonitrile monomers (EPN and EEPN) containing flexible glycidyl groups were synthesized using hydroxyl-containing phthalonitrile and epichlorohydrin as raw materials. The structures of the synthesized monomers were characterized by Fourier transform infrared (FT-IR), nuclear magnetic resonance (H-1-NMR and C-13-NMR) spectra and elemental analysis. Then each of them was blended with 4-(4-aminophenoxy)-phthalonitrile (APPN) and cured to obtain two kinds of amine-catalytic phthalonitrile-based crosslinked polymers. DSC results showed that two blending systems underwent a two-stage polymerization process with the increase of curing temperature. Rheological measurements exhibited that the introduction of glycidyl groups to phthalonitrile resin could greatly improve its processability. Moreover, after thermal cured at 300 celcius, the resulting phthalonitrile resins exhibited excellent mechanical performance, thermal and thermo-oxidative stability.

Automated summary

Two low melting point phthalonitrile monomers containing flexible glycidyl groups were synthesized and their polymerization and thermal properties were investigated. The results showed that the introduction of the glycidyl groups greatly improved the processability of the phthalonitrile resin and resulted in polymers with excellent thermal stability and mechanical performance after curing at 300 degrees Celsius.