Synthesis and characterization of new thermally stable copoly(ester–amide)s from diester–dicarboxylic acids

摘要: Abstract Three new aromatic diester–dicarboxylic acids containing furan rings, namely, benzofuro[2,3-b]benzofuran-2,9-dicarboxyl-bis-phenyl ester-4,4′-dicarboxylic acid, ester-3,3′-dicarboxylic acid and benzofuro[2,3-b]benzofuran-2,9-dicarboxyl-bis-naphthyl ester-2,2′-dicarboxylic were synthesized by the reaction of benzofuro[2,3-b]benzofuran-2,9-dicarbonyl chloride with 4-hydroxybenzoic 3-hydroxybenzoic 3-hydroxy-naphthalene-2-carboxylic respectively. Diester–dicarboxylic characterized FT-IR NMR spectroscopy elemental analyses. Then, these monomers converted to copoly(ester–amide)s their various diamines via direct polycondensation. These polymers viscosity measurements, solubility tests, FT-IR, Ultraviolet 1H-NMR thermogravimetry. The inherent viscosities in range 0.16–0.37 dl/g dimethyl sulfoxide at 30 °C obtained high yield. Most them dissolved readily room temperature polar solvents. possessed glass-transition temperatures from 210–255 °C. exhibited excellent thermal stabilities had 10% weight loss above 295 under nitrogen atmosphere.