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Synthesis and characterization of novel organosoluble polyesters based on a DIOL with azaquinoxaline ring
Author(s) -
Ghaemy M.,
Mighani H.,
Ziaei P.
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30726
Subject(s) - polyester , diol , condensation polymer , polymer chemistry , chemistry , inherent viscosity , yield (engineering) , glass transition , dimethylformamide , benzil , terephthalic acid , pyridine , quinoxaline , organic chemistry , materials science , polymer , intrinsic viscosity , solvent , catalysis , metallurgy
A series of new polyesters were synthesized by polycondensation of aliphatic and aromatic dicarboxylic dichlorides with a novel quinoxaline diol, 2,3‐bis (4‐hydroxy phenyl)‐5‐azaquinoxaline (DIOL). The DIOL was synthesized by reacting 4,4′‐dihydroxy benzil with 2, 3‐diaminopyridine (yield: 85%), and characterized by FTIR and 1 H‐NMR spectra. All polyesters showed good solubility in most aprotic polar solvents such as NMP ( N ‐methylpyrrolidone), DMF (dimethylformamide), DMSO (dimethylsulfoxide), DMAc (dimethylacetamide), HMPA (hexamethylenephosphoramide), and Py (pyridine). The inherent viscosity of polyesters was obtained in the range of 1.1–1.22 dL/mg. The glass transition temperatures of the polyesters were in the range of 200–280°C, as determined by DSC. The initial decomposition temperatures of the polyesters were above 300°C and the char yield at 750°C ranged from 30 to 60% under nitrogen atmosphere. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009