Synthesis and characterization of hyperbranched aromatic polyamide copolymers prepared from AB2 and AB monomers

A series of hyperbranched aromatic polyamide copolymers has been prepared and characterized from direct polycondensation of AB(2) and AB monomers. Structure of the monomers and the molar ratio of AB(2)/AB showed strong influence on the properties of resulting copolymers. A small amount of AB(2) branching unit improved markedly the solubility of the resulting copolymer. Mark-Houwink parameters of the copolymers were essentially independent of the mole ratio of the monomers. The physical and mechanical properties of resulting copolymers were influenced not only by the mole ratio of monomers, but also by the structure of the monomers employed.