Synthesis and properties of hyperbranched polyamide–esters derived from 1,3,5-tris(4′-hydroxyphenylcarbamoyl)benzene

A novel aromatic triol was synthesized and polycondensed with various diacid chlorides resulting in the preparation of a series of hydroxy-terminated hyperbranched polyamide–esters without gelation. Structure and degree of branching of the ensuing polymers were confirmed by FTIR, 1H and 13C NMR analyses. These thermally stable polymers were found to be soluble in aprotic solvents. Inherent viscosities and Tg values lie in the range of 0.15–0.21 dL/g and 74–112 °C, respectively.