Abstract
Dyeing of polyester fabrics with thienobenzochromene disperse dyes under conventional and microwave heating conditions was studied in order to determine whether microwave heating could be used to enhance the dyeability of polyester fabrics. Fastness properties of the dyed samples were measured. All samples dyed with or without microwave heating displayed excellent washing and perspiration fastness. The biological activities of the synthesized dyes against Gram positive bacteria, Gram negative bacteria, yeast and fungus were also evaluated.
Highlights
The energy of microwave photons is quite low compared with the chemical bond energies and, microwaves do not directly affect the molecular structure of a compound and they do not change the electronic configuration of atoms [1,2]
In conjunction with our interest in developing efficient routes to polyfunctional heteroaromatics as potential disperse dyes for polyester fabrics; we report here results of the reactivity of thienobenzochromene toward some aryldiazonium chlorides
The K/S values are ranged from 7.03 to 39.47 and 6.89 to 23.60 for the microwave dyed fabric and the conventional dyed fabric, respectively, All of these results indicate that the microwave dyed samples are better than the conventional samples in a very short dyeing time, These results in this study support the findings of the other researchers, like Oner et al [3], and Haggag et al [4], who showed that the microwave dyeing method is better than the conventional method due to shorter dyeing time, energy saving and better dye uptake
Summary
The energy of microwave photons is quite low compared with the chemical bond energies and, microwaves do not directly affect the molecular structure of a compound and they do not change the electronic configuration of atoms [1,2]. Despite the large number of reports on the utility of aminothienobenzochromene dyes in the dye industry [14,15,16,17,18], to our knowledge, their corresponding arylazothienobenzochromenes have never been reported as potential monoazo disperse dyes In view of these findings, and in continuation of our previous study on the synthesis of a variety of aminothienobenzochromene dyes [19], we report the synthesis of some arylazothienobenzochromenes dyes and their application as disperse dyes for dyeing polyester fabrics using microwave heating to enhance the dyeability of polyester fabrics and to investigate both of the colour and fastness properties of the dyed materials. The biological activities of the synthesized dyes against Gram negative bacteria, Gram positive bacteria, yeast and filamentous fungi were evaluated
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