Preparation and characterization of polyureas from divalent metal (Ba, Sr, Pb, Zn) salts of sulfanilic acid

摘要

AbstractMetal‐containing polyureas containing ionic linkages in the main chain can be obtained by the polyaddition reactions of 2,4‐tolylene diisocyanate with mixtures of divalent metal salts of sulfanilic acid (p‐aniline sulfonic acid ASA ) and 4,4′‐diaminodiphenylmethane. Ba, Zn, Pb, and Sr were used as divalent metals, and their structures were characterized by1H‐NMR,13C‐NMR, and IR. The polyureas were obtained with ASA(M) up to 100 in feed diamines and they were all soluble in DMF and DMSO. The inherent viscosity of the polyureas decreased markedly with an increase in metal content. The thermal properties of these polyureas were also investigated by DSC and TG. It was found that introducing the metal into the polyurea increased the thermal stability. © 1993 John W