Synthesis of hyperbranched aromatic polyamides by direct polycondensation

Some hyperbranched aromatic polyamides have been synthesized by direct polycondensation using the modified Higashi's method. Structures of the above polymers have been realized taking in proper account the analogies with amide group sequences of poly(p‐phenyleneterephthalamide) (PPDT) and poly(p‐benzamide) (PBA). Therefore, AB2‐ type monomers as well as suitable combinations of different bi‐ and trifunctional reactants (AA + B3) (e.g., p‐phenylenediamine + trimesic acid or other trifunctional acids) have been considered. For the latter systems, network formation has been minimized. In the present paper, our results on their direct polyamidation together with some preliminary characterization data on the resultant hyperbranched aramids are given.