Polyureas: Synthesis, Characterization and Dyeing Application in Nylon and Polyester

Abstract

Various 4-Arylazo-1,3-benzenediamine (AABs) dyes have been synthesized and polycondensed with hexamethylene diisocyanate (HMDI). The resultant poly (4-arylazo-1,3-benzeneurea-hexamethylene)s (PABUs) have been characterized by elemental analysis, IR spectroscopy and number average molecular weight () (Estimated by non-aqueous conductometric titration). Thermal properties of PABUs have been examined by thermogravimetric analysis. Their dyeing performance on nylon and polyester was assessed. The dyeing had yellow, orange and pink shades with moderate-to-good light- and wash fastness. Polymerization of AABs with HMDI on dyed nylon and polyester has also been performed. The dyeing properties of simple AAB dyes were compared with the dyes polymerized on nylon and polyester.

Keywords:

• Infrared spectra (IR)
• Number average molecular weight ( )
• Nylon
• Polyester fibres
• Polymerizable dyes
• Polyureas
• Thermogravimetry analysis (TGA)

ACKNOWLEDGMENT

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.