الفهرس 
Chapter 1Only 14 pages are availabe for public view
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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.