Amine-terminated aromatic and semi-aromatic hyperbranched polyamides: synthesis and characterization

Abstract

A facile synthetic approach to aromatic and semiaromatic amine-terminated hyperbranched polyamides via direct polymerization of triamine (B(3)) with different diacid chlorides (A(2)) was explored. An aromatic triamine, 1,3,5-tris(4'-aminophenylcarbamoyl)benzene (TAPCB), was synthesized and monomers were characterized by elemental analysis, FTIR, (1)H and (13)C NMR spectroscopy. Finally, the polycondensation reaction of TAPCB with terephthaloyl chloride (TPC), isophthaloyl chloride (IPC), sebacoyl chloride (SC) and adipoyl chloride (AC) resulted in the preparation of four hyperbranched polyamides i.e., HBPA 1, 2, 3 and 4, respectively. FTIR and (1)H NMR analyses confirmed the structures of the ensuing polymers and DB was found between 0.51-0.55. These thermally stable amorphous HBPAs were soluble in polar aprotic solvents at room temperature having glass transition temperatures (T(g)) between 138-198 A degrees C. Inherent viscosities (eta(inh)) and weight average molecular weights (M(w)) were in the range of 0.27-0.35 dL/g and 1.3 x 10(4)-2.7 x 10(4), respectively. Future prospects are envisaged.