Two diamines, 2,6-bis(4-aminophelioxy)pyridine and 2,6-bis(5-amino-1-naphenoxy)pyridine, were prepared through the nucleophilic aromatic substitution reaction of 4-aminophenol and 5-amino- l-naphthol, respectively, with 2,6-dichloropyridine. Poly(ether urea)s were synthesized through the polyaddition reactions of these diamines with aromatic, semiaromatic, and cycloaliphatic di-isocyanates. All the monomers and polymers were fully characterized, and physical properties of the polymers, including the thermal behavior, thermal stability, solubility, and solution viscosity, were studied. The polyureas showed improved thermal stability.(C) 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 961-965, 2004.