Synthesis and characterization of monomeric and polymeric dyes

Monomeric dyes have been synthesized by the diazotization of 2-amino-3,5-bi s(ethoxycarbonyl)-4-methylthiophene and coupled with various substituted N- arylmaleimides. The polymeric dyes have been derived fi om monomeric dyes b y the free radical addition polymerization. The polymeric dyes are characte rized by intrinsic viscosity, molecular weight by VPO and thermogravimetry. Monomeric and polymeric dyes also have been characterized by their IR spec tra and elemental analysis. All the dyes are applied on nylon and polyester fibres as a disperse dye and their dyeing properties are studied.