A series of monomeric dyes have been prepared by diazotization of various 2-aminobenzothiiazole and coupled with Resorcinol. The polymeric dyes have been prepared by polycondensation of monomeric dyes with hexamethylene diisocyanate (HMDI), and they are characterized by molecular weight, non-aqueous conductometric titration, thermogravimetry analysis, IR, visible spectroscopy, and elemental analysis. The monomeric dyes have also been characterized by elemental analysis and IR spectra. The purity of all the dyes have been checked by thin layer chromatography. The synthesized polymers with commercial epoxy resin diglycidyl ether of bisphenol A (DGEBA). The curing study of the prepared resins was monitored by DSC. Based on DSC thermograms, glass fibre reinforced composites have been laminated and characterized for chemical, mechanical and electrical properties. All the chemical, mechanical, and electrical tests on composites were conducted according to ASTM methods.