Abstract

J. O. Otutu¹, E. Osabohien¹ and E. M. Efurhievwe²

A series of nitrothiazole (heterocyclic) disazo dyes has been synthesised and their fastness properties on polyester and nylon fibres were investigated. 2-chloroaniline (carbocyclic) disazo dye analogs were also synthesized in order to compare fastness properties. The nitrothiazole disazo dye derivatives absorbed maximally at higher wavelengths but they are generally, tinctorially as strong as the 2-chloroaniline analogs. Also, the nitrothiazole disazo dyes exhibited higher light fastness on polyester substrate than on nylon. However, all the synthesized dyes showed excellent wash, and sublimation fastness on polyester and nylon substrates. The dyes were characterized by IR, uv-visible and 1 HNMR analyses.

Heterocyclic dyes; polyester; thermal properties and nylon

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