Abstract
In this study, a novel phthalonitrile monomer containing pyrimidine ring, 4,6‐bis[3‐(3,4‐dicya‐ nophenoxy)phenoxy]pyrimidine (BCPM), was successfully synthesized by nucleophilic substitution reaction with resorcinol, 4,6‐dichloropyrimidine and 4‐nitrophthalonitrile. The BCPM monomer was cured by different temperature programs with 4‐(aminophenoxy)phthalonitrile (APPH) as catalyst to give the polymers. The molecular structures of the BCPM monomer and the polymers were investigated by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. Differential scanning calorimetric (DSC) analysis was performed to study the processability of the BCPM monomer, which showed a wide processing window of about 117°C. The mechanical properties and thermal‐oxidative stability of the polymer were characterized by dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA), respectively, which indicated that the polymers exhibited excellent storage modulus, high glass transition temperature over 400°C, and outstanding thermal stability. The polymers also have low water absorption capacity and are suitable for humid environments.
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