Nucleophilic addition of reactive dyes on amidoximated acrylic fabrics.

Reda M El-Shishtawy,Manal M El-Zawahry,Nahed S E Ahmed,Fatma Abdelghaffar

doi:10.1155/2014/305930

Reda M El-Shishtawy, Manal M El-Zawahry + Show 2 more

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https://doi.org/10.1155/2014/305930

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Abstract

Seven reactive dyes judiciously selected based on chemical structures and fixation mechanisms were applied at 2% owf of shade on amidoximated acrylic fabrics. Amidoximated acrylic fabric has been obtained by a viable amidoximation process. The dyeability of these fabrics was evaluated with respect to the dye exhaustion, fixation, and colour strength under different conditions of temperature and dyeing time. Nucleophilic addition type reactive dyes show higher colour data compared to nucleophilic substitution ones. FTIR studies further implicate the binding of reactive dyes on these fabrics. A tentative mechanism is proposed to rationalize the high fixation yield obtained using nucleophilic addition type reactive dyes. Also, the levelling and fastness properties were evaluated for all dyes used. Excellent to good fastness and levelling properties were obtained for all samples irrespective of the dye used. The result of investigation offers a new method for a viable reactive dyeing of amidoximated acrylic fabrics.

Highlights

Acrylic fabric is a wool-like fabric with outstanding chemical and physical properties such as lightweight, soft, high strength, and good abrasion and insect resistance
As acrylic fabrics are widely used in textile blends with natural fabrics such as wool and cotton, the viability of using different dyes for the colouration of acrylic fabrics would have a positive impact on textile industries
The amidoximated acrylic fabrics were dyed using seven judiciously selected reactive dyes (Figure 1): four reactive dyes based on nucleophilic addition, one reactive dye based on nucleophilic substitution, and two bifunctional reactive dyes, one homobifunctional and the second heterobifunctional reactive dyes

Summary

Introduction

Acrylic fabric is a wool-like fabric with outstanding chemical and physical properties such as lightweight, soft, high strength, and good abrasion and insect resistance. As acrylic fabrics are widely used in textile blends with natural fabrics such as wool and cotton, the viability of using different dyes for the colouration of acrylic fabrics would have a positive impact on textile industries In this regard, reactive dyes and anionic dyes such as acid dyes are not usually used for acrylic colouration as these dyes suffer from being not substantive for the fabrics as a result of the repulsive effects that occur between the anionic groups present in the fabrics and those present in the dye molecules. The amidoxime groups as the active dye sites have proven effectiveness in increasing the substantivity of acrylic fabrics toward anionic dyes at an acidic pH [4,5,6,7]

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