Sustainable application of eugenol-derived azo dyes on cotton fabrics.
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| Title: | Sustainable application of eugenol-derived azo dyes on cotton fabrics. |
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| Authors: | Mendes, Filipa D.P.1 (AUTHOR), Coelho, José R.A.1 (AUTHOR), Fernandes, Maria José G.1 (AUTHOR), Fernandes, Ana M.2 (AUTHOR), Silva, Carla J.2 (AUTHOR), Gonçalves, M. Sameiro T.1 (AUTHOR) msameiro@quimica.uminho.pt |
| Source: | Dyes & Pigments. Sep2026, Vol. 252, pN.PAG-N.PAG. 1p. |
| Subjects: | Azo dyes, Cotton textiles, Surface preparation, Textile dyeing |
| Abstract: | The growing demand for eco-friendly alternatives in the textile industry has encouraged the exploration of natural products as sustainable sources for dye synthesis. This study reports the design, synthesis, and application of azo dyes obtained from eugenol combined with aminobenzoic acid derivatives. The dyes 3a-d and 5 were synthesized through classical diazotization–coupling strategies and structurally characterised by standard techniques. The UV - Vis absorption measurements in aqueous solutions at varying pH revealed strong absorption and stable colour behaviour across a wide pH range. Textile application studies demonstrated that these dyes produce uniform and vivid colours on cotton knitted fabrics, with crude dye forms generally exhibiting higher colour strength (K/S up to 0.98) than purified samples, suggesting that residual components may enhance dye - fibre interactions and reduce purification requirements. Pretreatment with cationic agents, particularly OPTIFIX E50 LIQ, significantly improved dye uptake (K/S up to 1.88) and washing durability on cellulose substrates (up to 3 on the grey scale), while coating techniques further enhanced colour intensity (K/S up to 4.16). These results highlight the potential of eugenol-based azo dyes as sustainable alternatives to conventional synthetic dyes for textile coloration. • A series of eugenol azo dyes were successfully synthesized via diazotization-coupling reactions. • Cotton knitted fabrics exhibited uniform and intense coloration enhanced by cationic pretreatment under exhaust dyeing. • Coating techniques significantly improved colour intensity and fastness with minimal resource use. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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