Soluble copolymers via oxidative polymerization of pyrimidylamine and anisidine

A series of copolymers was synthesized by oxidative polymerization of 2-pyr imidylamine (MA) and o-anisidine (AS) with five monomer ratios using ammoni um persulfate as an oxidant in 1 M HCl aqueous solution at room temperature . The yield, intrinsic viscosity, and solubility of the MA/AS copolymers we re studied in detail. The copolymers were characterized by H-1 NMR, FT-IR, wide-angle X-ray diffraction, and thermogravimetry. Based on H-1 NMR spectr a of the copolymers, the actual MA/AS molar ratio in the copolymers was com pared with their feed ratio. The results showed that the MA/AS copolymers a re amorphous and their polymerization yield, intrinsic viscosity, solubilit y in common organic solvent, thermostability, as well as activation energy of thermal degradation all increase with increasing AS content, but their c har yield at 700 degreesC in nitrogen decreases. (C) 2001 Elsevier Science Ltd. All rights reserved.