Abstract
AbstractMetal‐containing polyureas having ionic links in the main chain were synthesized by the polyaddition reactions of 2,4‐toluylene diisocyanate with mixtures of divalent metal salts of p‐aminobenzoic acid and 4,4′‐diaminodiphenylmethane (4,4′‐methylenedianiline). Mg and Ca were used as the divalent metal. The polyureas obtained were slightly yellowish powders and those with low metal content were soluble in dimethylacetamide (DMAc) and dimethylsulfoxide (DMSO). The inherent viscosity (at 0.5 g/100 mL) of the polyureas decreased markedly with an increase in metal content. In addition, the reduced viscosities in DMAc and DMSO were very low at very low concentration but became higher as the concentration increased, especially in DMAc having a somewhat lower dielectric constant. This viscosity increase at high concentrations is attributed to ionic association. Introducing the metal into the polyurea lowered the thermal properties as indicated by decreased decomposition temperatures. The polyureas with low metal contents gave films by solvent‐casting although increasing the metal content made the films brittle. Further, dynamic mechanical properties were discussed.
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