الفهرس | Only 14 pages are availabe for public view |
Abstract The first research discusses the synthesis of some bis azo disperse dyes based on benzidine and four couplers contain active methylene group, namely; thiobarbituric acid, barbituric acid, dimedone and thiohydantoin, to give 5,5’-([1,1’-Biphenyl]-4,4’- diylbis(diazene-2,1-diyl))bis(6-hydroxy-2-thioxo-2,3-dihydropyrimidin-4(1H)-one),3a, 5,5’-([1,1’-biphenyl]-4,4’-diylbis(diazene-2,1-diyl))bis(6-hydroxypyrimidine-2,4(1H,3H)- dione),3b, 2,2’-([1,1’-biphenyl]-4,4’ diylbis(diazene-2,1-diyl))bis(3-hydroxy-5,5- dimethylcyclohex-2-enone),3c, and 5,5’-(2,2’-([1,1’-biphenyl]-4,4’-diyl)bis(hydrazin-2-yl- 1-ylidene))bis(2-thioxoimidazolidin-4-one),4, respectively. The chemical structures of dye products were identified by UV–visible, FT-IR, 1H NMR and 13C NMR spectroscopy. The electronic absorptions of the synthesized dyes indicated that the λmax are slightly dependent on the coupler moieties and quite sensitive to pH change. Dyeing of polyester yarn(PE-Y) was done in DMF, whereas, polyester fabric (PE-F) was dyed in water using dispersing agent DYEWELL-002. Fastness properties of bis azo dyes 3a-c and 4 on PE-F are better than those of PE-Y. |