Photostability of Monoazo Disperse Dyes in Different Solvents

摘要

Twelve monoazo disperse dyes were synthesized and then characterized by melting point (m.p.)measurement, elemental analysis and ~1H-NMR. The photostability of monoazo disperse dyes in solvents with different polarities was evaluated thereafter the dyes in each solvent were irradiated with visible light for 8 hours. The percentage of photostability of the dye decreased from the initial value in the range of 5-10%. The photostability was affected by the substituted group of the dyes regardless of the solvent used. Different R_1 group on the diazo component increased the photostability in order of H>CN>Cl. The photostability of the dye was also higher when R_2 group on the coupling component was a methyl group.