The present work aims to investigate and develop a series of monoazo dyes containing dadecyl group for the polyester and polyamide fabrics. These dyes were obtained by the coupling of diazotised,4-dodecylaniline with I-naphthol,2-naphthol, 2-hydroxy-3-naphthoic acid, 2-hydroxy-4-naphthoic acid, 2,3dihydroxynaphthalene, 2-Hydroxy-3-naphthoic Acid Anilide. The resulting chemical structure of monoazo dyes were subject to mass,IH-NMR,UVNIS,IR and Element Analysis investigation. All dyes were dyed on polyester,and polyamide fabrics and their dyeing and fastness properties evaluated. The fastness properties of all the dyed samples were in accord with commercial requirements,and all of the monoazo dyes dyed polyester and polyamide fabrics to get vely good water-repellent property.
