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Abstract
Crysodine type dyes were prepared by the coupling of 2-diazobenzothiazole derivatives with 1,3-benzenediamine. The resultant dyes were characterized duly. Each dye was then polycondensed with 1,6-hexamethylene diisocyanate. The resultant polyureas (PU) having a pendent azo chromophoric group were characterized by elemental analysis, spectral studies, and number average molecular weight () estimated by nonaqueous conductometric titration and thermogravimetry.
A commercial diglycidylether of bisphenol-A (DGEBA) epoxy resin was cured by using these PUs. The study was monitored by differential scanning calorimetry (DSC) and glass reinforcement.
The authors are thankful to Sardar Vallabhbhai National Institute of Technology, Surat, for providing the research facility. They are also thankful to Prof. K. R. Desai for providing guidance for the synthesis and Prof. H. S. Patel for providing instrumental facilities and valuable guidance for their application.