Synthesis And Characterization Of Hyperbranched Polyamides

Recently, dendritic and hyperbrached polymers have drawn the attention of various research groups because of their unique thermal, mechanical and chemical properties. In particular, the one - step synthesis of hyperbranched structures overcomes most of the problems associated with the tedious, multi-step dendrimer preparation. In this paper, two new AB2 monomers, 4-(3,5-diaminobenzamido) benzoic acid and N-(3,5-diaminobenzoyl)-glycine from 4-aminobenzoic acid, glycine and 3,5-dinitrobenzoyl chloride, have been prepared and characterized. Aromatic hyperbranched polyamides have been synthesized by self-condensation reaction of 4-(3,5-diaminobenzamido)benzoic acid and N-(3,5-diaminobenzoyl)- glycine, and a series of hyperbranched polyamides end-group modified have also been prepared by end-capping reaction with acid chlorides. The aromatic hyperbranched polyamides and those modified have been characterized by FTIR, 1H NMR, 13CNMR ,DSC, and TGA measurement.