SYNTHESIS AND PROPERTIES OF NOVEL AROMATIC HYPERBRANCHED POLYAMIDE PREPARED BY DIRECT POLYCONDENSATION

An aromatic hyperbranched polyamide was synthesized by the direct poly condensation of an AB(2) type monomer (3,5-bis(4-aminophenoxy)benzoic acid) in NMP in the presence of triphenyl phosphite and pyridine as co ndensing agents. Structure of the monomer and the resulting polymer wa s identified by IR, H-1-NMR, and C-13-NMR measurements. The polymer wa s soluble in DMF, DMAc, NMP, DMSO, m-cresol and 2-methoxyethanol. Degr ee of branching of the polymer was determined as 48% by the integratio n ratio in the C-13- NMR spectrum. The glass transition temperature (T -g) was observed at 200 degrees C in DSC measurement. The onset temper ature (T-0) and the temperature of 10% weight loss (T-10) were determi ned as 310 degrees C and 530 degrees C, respectively, in TGA measureme nt.