Investigation of the Effect of Inclusion Complexes on the Dyeing of Soybean Fibers

This study was conducted to assess the dyeability of soybean fibers. The dyeing process was performed at three different temperatures (20°C, 50°C, and 90°C) using two types of dyestuffs: acid and reactive dyes. The entire dyeing procedure was repeated in the presence of cyclodextrin to investigate whether cyclodextrins influence dye uptake. Color measurements of the dyed fibers were conducted based on the CIE-Lab color system. Additionally, washing fastness test was carried out to assess the colorfastness of the dyed fibers. To examine potential differences in the morphological structure of the fibers, fiber images were observed under an optical microscope. Furthermore, FT-IR analysis was performed to investigate potential bonding interactions between cyclodextrins and the fiber structure. The findings indicated that soybean fibers are not suitable for dyeing at high temperatures, as this leads to structural deterioration in the fibers. In contrast, the use of cyclodextrins enhanced dye uptake and resulted in higher color strength and color uniformity, particularly at 50 °C. The presence of cyclodextrins also contributed to a slight improvement in washing fastness, especially in cotton and wool multifiber samples. Based on the color yield and fastness tests conducted, the optimal dyeing temperature was determined to be 50°C, and the use of cyclodextrins was found to be effective in improving dyeing performance without causing fiber damage.