Facile synthesis and dyeing performance of some disperse monomeric and polymeric dyes on nylon and polyester fabrics
Document Type
Article
Publication Date
1-1-2021
Abstract
Monoazo disperse polymeric dyes consisting of polyarylazocarboxybenzene-formaldehyde (PACB-F) and polyarylazohydroxynaphthalene-formaldehyde (PAHN-F) were synthesized through diazotisation, coupling and polycondensation reactions in the presence of formaldehyde and aqueous oxalic acid. The structure of the as synthesised dyes was acquired using UV-visible absorption maxima and FT-IR spectroscopy and their color, yield, melting point, solubility, and viscosity determined via standard methods. UV-visible and FTIR results showed successful formation of the polymeric dyes due to shift of wavelength of maximum absorption (lambda(max)) (420-470 nm, 460-510 nm) and new absorption peak at around (2800-2995 cm(-1)) for methylene bridge, respectively. The yield of the monomeric dyes was 67.1-85.7% and polymeric 45.1-59.3%, melting point was 104.1-131.2 degrees C, and 136.0-143.5 degrees C, respectively. They are soluble in acetone, ethanol, and methanol and insoluble in n-hexane and water. The dyeing process was achieved via high temperature and carrier dyeing techniques on nylon and polyester fibers. The dyeing characteristics of the synthesised dyes were analyzed in comparison with commercial disperse dyes (terasil brilliant violet and terasil scarlet brown). The dyeing produced a very attractive hue brown shades with good to excellent washing, light, hot pressing, and rubbing fastness.
Keywords
Carbocyclic, Dyeing activity, Monoazo, Monomeric, Polymeric
Funders
Tertiary Education Trust Fund (TETFUND) Nigeria,School of Chemical Science, Universiti Sains, Malaysia
Publication Title
Bulletin of the Chemical Society of Ethiopia
Volume
35
Issue
3
Publisher
Chem Soc Ethiopia