Abstract
ABSTRACT A new series of copolyamides CoPAs 7a-f were synthesized through the direct polycondensation reaction of 4,4’-azobenzenedicarboxylic acid 1 with 1,5-naphthalenediamine 2 , 3,4-diaminobenzophenone 3 in the presence of adipic acid 4 , fumaric acid 5 and terephthalic acid 6 as a second diacid in a medium consisting of N-methyl-2-pyrrolidone, triphenyl phosphate (TPP), calcium chloride and pyridine. The obtained polymers were characterized by means of FT-IR spectroscopy, elemental analyses and inherent viscosity. These CoPAs were highly soluble in polar aprotic solvents such as N,N -dimethylacetamide (DMAc), N,N -dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N -methyl-2-pyrrolidone (NMP) and other solvents such as sulfuric acid. Thermal properties of the CoPAs 7c, 7d and 7e were investigated using thermal gravimetric analysis (TGA and DTG). Key word: Copolymers; Azobenzene; Direct polycondensation, High-performance polymers e-mail: k-faghihi@araku.ac.ir INTRODUCTION Aromatic polyamides possess excellent mechanical properties and thermal stability; however, they are difficult to process because of their limited solubil-ity and to high glass transition (T
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