Hybrid nitrile-based reactive diluent for phthalonitrile resins

A hybrid diluent containing both phthalonitrile and benzonitrile functions was tested for improvement of phthalonitrile resin processability. The composites were obtained by the solvent-free prepreg technique and characterized by thermal and mechanical tests (σ₁₁⁺ = 640 MPa at room temperature with 100% retention at 400 °C) and preserved 50% of the strength after 1000 h aging at 350 °C.