Characterization of dimethyl sulfoxide-treated wool and enhancement of reactive wool dyeing in non-aqueous medium

Abstract

Wool pretreated with dimethyl sulfoxide (DMSO) was characterized and its dyeing behavior in non-aqueous green solvents was investigated. Reactive dyeing of wool in deep shades is challenging because the mandatory alkaline aftertreatment to match the fastness of mordant dyes inevitably causes damage to wool keratin. The current study showed that the colorfastness-integrity dilemma could be solved by replacing water with organic solvents as the dyeing medium. Covalent fixation is predominantly favored in solvent dyeing so that excellent colorfastness is achievable at any given shade without alkali aftertreatment. Compared with aqueous dyeing, solvent dyeing was found to give 30% higher covalent fixation on average, which translated to better colorfastness (0.5–1 grade) at higher color depth (ΔK/S = 1.3–4.9). In addition, scanning electron microscopy, X-ray diffraction and attenuated total reflection-infrared spectroscopy results indicated that DMSO pretreatment induced morphological and structural changes of wool in favor of dyeability. The findings are crucial to the phasing-out of metal-containing dyes for eco-friendly wool dyeing.

Keywords

wool keratin fiber reactive dyeing dimethyl sulfoxide morphology covalent anchoring

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References

Lewis

Rippon

. The coloration of wool and other keratin fibres, New York: John Wiley & Sons, 2013, pp. 21–21.

Edwards

Freeman

. Synthetic dyes based on environmental considerations. Part 3: aquatic toxicity of iron‐complexed azo dyes. Color Tech 2005; 121: 265–270.

Freeman

Sokolowska

. Developments in dyestuff chemistry. Rev Prog Color Rel Topics 1999; 29: 8–22.

Lewis

. The aftertreatment of wool dyeings to obtain improved wet fastness. J Soc Dyers Colour 1992; 108: 317–324.

Lewis

. Damage in wool dyeing. Rev Prog Color Rel Topics 1989; 19: 49–56.

Lei

Lewis

Shen

. Crosslinking nucleophilic dyes on wool. Dyes Pigments 1996; 30: 271–281.

Pielesz

. Spectroscopic study of interactions between model direct dyes and cotton. J Appl Polym Sci 2007; 104: 758–766.

Wang

Ruan

Chen

. Heterogeneous chemical modification of cotton cellulose with vinyl sulfone dyes in non-nucleophilic organic solvents. Ind Eng Chem Res 2014; 53: 15802–15810.

Chen

Wang

Chen

. Comprehensive study on cellulose swelling for completely recyclable nonaqueous reactive dyeing. Ind Eng Chem Res 2015; 54: 2439–2446.

10.

Friedman

Koenig

. Effect of dimethyl sulfoxide on chemical and physical properties of wool. Text Res J 1971; 41: 605–609.

11.

Koenig

Friedman

. Combined application of reactive compounds in nonaqueous swelling solvents for flame-and shrink-resistant wool. Text Res J 1977; 47: 139–141.

12.

El-Shishtawy

Youssef

Ahmed

NSE

. The use of sodium edate in dyeing: II. Union dyeing of cotton/wool blend with hetero bi-functional reactive dyes. Dyes Pigments 2007; 72: 57–65.

13.

Lewis

Smith

. The role of vinylsulphonyl reactive dyes in prevention of wool damage. J Soc Dyers Colour 1991; 107: 357–362.

14.

Fraser

MacRae

Rogers

. Molecular organization in alpha-keratin. Nature 1962; 193: 1052–1055.

15.

Mazzaferri

Young

Oertel

. papillary thyroid carcinoma: the impact of therapy in 576 patients. Medicine 1977; 56: 171–196.

16.

Anigbogu

Williams

Barry

. Fourier transform Raman spectroscopy of interactions between the penetration enhancer dimethyl sulfoxide and human stratum corneum. Int J Pharm 1995; 125: 265–282.

17.

Williams

Barry

. Penetration enhancers. Adv Drug Deliver Rev 2012; 64: 128–137.

18.

Rippon

Harrigan

Record

. New method for dyeing wool at temperature below the boil. Wool Rec 1994; 4: 53–55.

19.

Johnson

Russell

. Advances in wool technology, Cambridge: Elsevier, 2008, pp. 222–222.

20.

Bruce

Broadwood

King

. Kinetics of wool dyeing with acid dyes. Text Res J 2000; 70: 525–531.