Some new pyridine-based polyureas, design, preparation, characterization, thermal and chemical properties

Polyureas may be classified as heterochain macromolecules, which contain urea groups in their chain. Although the chemistry and technology of polyureas are of recent origin, thechemistry of ureas dates back over 100 years. They are used for castings. Polyureas containing aromatic structures meltnear their decomposition temperatures. Polyureas were first prepared on a commercial scale at I.G. Farben, employing the reaction between diisocyanate and diamines. Today, polyureas and copolyureas (especially polyurethane polyureas) have many practical applications as foams, elastomers, adhesives,fibers, etc [1-3]. Potentially more useful polyureas are those containing other functional groups.A wide range of commercial polymers containing urea groups, such as urea– formaldehyde resins, poly(amide urea)s, poly(urethane urea)s used as cast elastomers,and poly(ether urea acrylate)s, used as surface coatings have been reported