Аннотация:New phthalonitrile resin formulation based on the low-melting phosphorus-containing monomer
bis(3-(3,4-dicyanophenoxy)phenyl) phenyl phosphate recently reported by our research group,
common phthalonitrile 1,3-bis (3,4-dicyanophenoxy)benzene and aromatic diamine as curing
agent was developed. The resin processing properties (melt viscosity 150 mPa∙s at 150°C)
allowed to produce carbon fiber composites by vacuum infusion molding process and resin
transfer molding at 150 °C. The curing cycle consisting of 3 hours at 180 °C and post-curing at
375 °C was required to achieve the best thermal properties. After post-curing the obtained
composites demonstrated up to 90 % mechanical properties retention at 400 °C (τr.t.12 = 60–80
MPa). Flame retardant properties were investigated and the composites demonstrated extremely
high LOI > 80 %. Thus easily processable phthalonitriles with quick curing and excellent heat
resistant and flame retardant properties were developed