Oxidative polymerization of o-phenylenediamine and pyrimidylamine

摘要

Oxidative polymerization of o-phenylenediamine and 2-pyrimidylamine (MA) was performed by using three molar ratios of ammonium persulfate as an oxidant in boiling glacial acetic acid. The polymerization yield decreases significantly but the intrinsic viscosity of the polymers increases slightly with increasing the feed content of 2-pyrimidylamine. The resulting polymers were characterized by ~1H-nuclear magnetic resonance and Fourier transform Infrared spectroscopies, wide-angle X-ray diffraction, and thermogravimetry. The results suggested that the polymers are amorphous and exhibit thermal decomposition temperatures higher than 560℃, the maximum weight-loss rate was lower than 3.5/100/min, char yield larger than 17 wt./100 at 700℃ in nitrogen and air. The activation energy of thermal decomposition for the copolymers was 43 53 kJ/mol in nitrogen and air.