Study the effect of different dyeing conditions of extracted natural dye from leaves of neem on silk fabrics

Abstract

The aim of the present work was to evaluate the effect of artificial day light for 160 h on silk fabrics dyeing with different conditions such as; different dye bath pH values, different dyeing temperatures, and different dyeing times; of extracted natural dye from Azadirachta indica (neem) leaves. The reflectance spectra of the untreated and treated silk fabrics were followed using spectrophotometer technique. The effects of dyeing conditions in the optical parameters, such as; CIE tristimulus values, color parameters, absorption coefficient as well as extinction coefficient and color strength, were determined before and after exposure. The obtained results indicate that the silk fabrics were found to be highly dependent on either of these different dyeing conditions and/or artificial day light exposure. Also, variations in the values of the optical band gap energy were detected. Improvement in the dyeing process were produced which may be attributed to the induced structural change due to the variation in the chemical bonds in silk fabrics. The present work gives the chance to produce a new traditional natural dye to meet the environmental future demands technology of high quality fantastic dyed pattern.

Color Parameters and Optical Properties of Silk Fabrics Dyed with Natural Dye (Artemisia Herba-Alba)

“…It is observed in figure (4c) that a gradual increase in the absorption coefficient values for both unexposed and exposed to artificial daylight for 160 hrs (up to 60 o C ) appear slightly similar value and then slightly decreased (up to 80 o C) as a result of the degradation process. So that, we detected that an increase in the absorption coefficient values with increasing Artemisia Herba-Alba dye bath pH values up to 5, time up to 45 minutes, and temperature up to 60 o C. From the observed results [33], the variations may be due to modification in molecular structure as a result of the degradation process and the dye component's role was to strengthen the linkage between the reactive species of the silk fabric chemical groups and their polar groups.…”