A new interesting class Of polyurea derivatives 5(a-c) was synthesized using solution polycondensation technique by the interaction of I mol of 4,4'-bis(2 ''-amino-thiazol-4 ''-yl)diphenyl ether monomer 3 with 1 mol of diisocyanate compounds in pyridine. The model compound 4 was synthesized by the interaction of 1 mol of monomers 3 with 2 mol of phenylisocyanate in pyridine, and the structure was confirmed by correct elemental and spectral analyses. The resulting polymers were characterized by elemental and spectral analyses besides solubility and viscometry measurements. The thermal properties of those polymers were evaluated by TGA, DTG, and DTA measurements and correlated to their structural units. In addition, the morphological properties of a selected example were tested by SEM, and the electrical properties of these polymers were measured. On the other hand, the corrosion inhibition properties of selected example of polyurea derivatives were carried Out on steel in 0.5M H2SO4 at 40 degrees C giving cathodic inhibition. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 620-628, 2009