Synthesis and characterization of bis-azodiols and their utilization in the coloured polyesters

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">A series of coloured polyesters has been synthesized by interfacial polycondensation reaction of terephthaloyl chloride and various bis-azodiols derived from diarylidene cyclopentanone and diarylidene cyclohexanone by coupling with various diazotized fast bases. All the coloured polyesters were characterized by elemental analysis, IR spectroscopy, UV-visible spectroscopy, viscometry, solubility, bleeding test and thermogravimetric analysis. The bis-azodiols were applied on nylon and polyester fibres and their dyeing performance assessed. These dyes showed fair to good fastness to light and very good to excellent fastness to washing, rubbing, perspiration and sublimation.</span>