Synthesis and Application of Monoazo Disperse Dyes Derived from 4-amino-Nhexadecyl-1, 8-naphthalimide and their Dyeing Performance on Polyester Fabrics

A series of monoazo disperse dyes were synthesized using 4-amino-N-hexadecyl-1, 8-naphthalimide by coupling with different substituted electron rich arenes in appropriate reaction conditions. The synthesized diazo component and the dyes were purified by recrystallization method. The structures of the diazo component and the dyes were confirmed using UV-visible, FT-IR, NMR and MS spectroscopic techniques. Spectrophotometric investigations of the dyes in solvents of different polarities were carried out in order to obtain their absorption maxima, molar extinction coefficient and solvatochromic effects. These dyes were applied on polyester fabrics using High Temperature and High Pressure (HTHP) exhaust dyeing method. The dyeing characteristics such as build up on fabrics, wash, perspiration and light fastness were examined. The dyed fabric generally gave deep and bright hue ranging from light yellow, orange, maroon and neon red. The colour fastness of the dyed fabrics to washing and perspiration were examined to be very good, however, the light fastness was found to be fair to good