Abstract
A novel bisphthalonitrile containing diamino group (BhPN) was successfully synthesized and characterized by FT-IR and 1H NMR spectra. The BhPN monomer showed a self-promoted curing behavior and good processability confirmed by differential scanning analysis and rheological analysis, respectively, and its apparent activation energy was determined by the Kissinger’s method. Thermogravimetric analysis and dynamic mechanical analysis indicated that the temperatures of 10% weight loss and glass-transition of BhPN polymer were in the ranges of 480–506 °C and 307–403 °C, respectively, which were significantly dependent on the curing temperature. Furthermore, the BhPN monomer was used as a new curing agent of bisphenol-A diglycidyl ether (DGEBA) and the possible curing mechanism was proposed. The thermal stabilities and viscoelastic properties of epoxy resins cured with different curing agents including BhPN and 4,4′-diaminodiphenyl methane (DDM) were made a detailed comparison. As a result, the cured DGEBA/BhPN system showed higher char yield, glass-transition temperature, and elasticity modulus compared to the DGEBA/DDM system because of the additional polymerization of cyano groups.
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