Abstract: Nine new red azo dyes containing aromatic nitro group and maleic monoamide were synthesized which are capable of dyeing polyester and cotton fiber blends. Maleic monoamide substituent in the dyes makes the latter soluble in water.The dyed PET/cotton blends showed a certain grade of fastness.

Key words: azo dyes, maleic monoamide, PET/cotton blend, dye synthesis