Synthesis and Application of Monoazo Acid Dyes Containing Long Chain Perfluoroalkyl Group for Water Repellant Polyamides

Abstract

In the present investigation, γ-acid was reacted first with   acid chloride namely pentadecafluoro octanoyl chloride,   which was synthesized by the reaction with thionyl chloride   and pentadecafluoro octaconic acid. The resulting compound   was coupled with m-toluidine and thus dye 1F1 of reddish   pink hue was synthesized. Similarly in place of m-toluidine,   m-trifluromethyl aniline was used with the same intermediate   and dye 1F2 with brighter reddish pink was obtained. In case   of 2F1 and 2F2 dyes synthesized only the γ-acid in 1F1 and   1F2 was replaced by H-acid. These dyes are brown in shade.   The water repellency effect of a long chain derivative containing   perfluoro group on the fabric dyed with the synthesized modified   monoazo acid dyes was studied.