Synthesis, Characterization, and Glass Reinforcement of Various Epoxy Resins-Polyurea Systems

Abstract

Polyureas (PU)s were prepared by the polycondensation reaction of disperse dyes containing –NH₂ group and toluene 2,4-diisocyanate. The disperse dyes have been prepared by coupling of various 2-diazobenzothiazoles with 1,3-benzenediamine. All the PUs were characterized by elemental analysis, spectral studies, number average molecular weight (), and thermogravimetry. Further reaction of PUs was carried out with different epoxy resins, namely DGEBA, DGEBC, and DGEBF. The curing study of these prepared resins was monitored by DSC and their kinetic parameters have been evaluated. Based on DSC thermograms, glass-fiber-reinforced composites have been laminated and characterized by chemical, mechanical, and electrical properties.

Keywords:

• differential scanning calorimeter (DSC)
• epoxy resin
• glass reinforced composites
• infrared spectra (IR)
• number average molecular weight (overline )
• polyureas
• thermogravimetry analysis (TGA)

Acknowledgments

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 the application.