New polyamides containing azobenzene unites and hydantoin derivatives in main chain: synthesis and characterization |
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Authors: | Khalil Faghihi Mohssen Hagibeygi |
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Affiliation: | Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Faculty of Science, Arak University, Beheshti Street, Arak 38156, Iran |
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Abstract: | Eight new polyamides containing azo moieties and hydantoin groups were synthesized under microwave irradiation by using a domestic microwave oven from the polycondensation reactions of 4,4′-azodibenzoyl chloride [4,4′-azobenzenedicarboxylic acid] 3 with eight different derivatives of 5,5-disubstituted hydantoin 4a-h in the presence of a small amount of a polar organic medium such as o-cresol. The polycondensation proceeded rapidly, compared with the bulk polycondensation and the solution polycondensation and was completed between 7-12 min, producing a series of new polyamides 5a-h in high yield, and inherent viscosity between 0.35 and 0.60 dL/g. The resulting polyamides were characterized by elemental analysis, viscosity measurements, thermal gravimetric analysis (TGA and DTG), solubility test and FT-IR spectroscopy. All of the polymers were soluble at room temperature in polar solvents such as N,N-dimethylacetamide, N,N-dimethylformamide, dimethylsulfoxide, tetrahydrofurane and N-methyl-2-pyrrolidone. |
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Keywords: | 4,4&prime -Azodibenzoyl chloride 5,5-Disubstituted hydantoin derivatives Microwave assisted polycondensation |
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