Coupling coloration of meta-aramid fabric utilising diazonium salts from weakly basic aromatic amines / Hua Jiang in COLORATION TECHNOLOGY, Vol. 140, N° 1 (02/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 1 (02/2024) . - p. 75-90 Titre : Coupling coloration of meta-aramid fabric utilising diazonium salts from weakly basic aromatic amines Type de document : texte imprimé Auteurs : Hua Jiang, Auteur ; Jixian Song, Auteur ; Zhihua Cui, Auteur ; Weiguo Chen, Auteur Année de publication : 2024 Article en page(s) : p. 75-90 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromophores Colorants azoïques Diazonium Un diazonium est un cation formé d'un groupe de deux atomes d'azotes en position terminale sur une molécule. La structure R-N≡N+ est également considérée comme un groupe fonctionnel. Fibre aramide Réaction de couplage Sels de diazonium Solidité de la couleur Teinture -- Fibres textiles synthétiques Textiles et tissus -- Propriétés mécaniques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Meta-aramid fibre exhibits poor dyeing performance when treated using conventional dyeing methods. In this study, coloration of meta-aramid fabrics was performed at room temperature utilising diazonium salts from weakly basic aromatic amines and was achieved via in situ construction of azo chromophores on the meta-phenylenediamine moiety. To promote diazonium-salt penetration into the meta-aramid fibre, the pretreatment of meta-aramid fabrics with dimethyl sulfoxide at 55°C for 30 min and the utilisation of methanol were involved during the coloration process. As a result, the fabrics could be coloured with deep, levelled and firm shades of brown series. The azo chromophore is derived from the skeleton of the polyamide chain. Therefore, the coloured fabrics exhibit good resistance to organic solvents as well as good to excellent colour fastness to soaping, rubbing and sublimation. A study of the coloration mechanism revealed that the terminal and middle meta-phenylenediamine moieties serve as the main coupling reaction sites. When treated with a diazonium salt, the highly reactive terminal meta-phenylenediamine moiety reacted first and generated chromophores with an absorption peak in the long-wavelength region. However, such chromophores only contributed a limited colour depth owing to the limited number of the terminals. If excess diazonium salts were used, the main hue can be attributed to the azo chromophores based on the massive middle meta-phenylenediamine moieties, although these moieties are less reactive than the terminal meta-phenylenediamine. Note de contenu : - EXPERIMENTAL : Chemicals and materials - General method for the preparation of diazonium salts from weakly basic aromatic amines - General method for preparation of diazonium salts from strongly basic aromatic amines - Pretreatment of meta-aramid fabric - General coloration procedure - Synthesis of compound 1a - Synthesis of compound 1b - Synthesis of compound 1c - Synthesis of compound 2 - General procedure of high-temperature-high-pressure dyeing method - Determination of colour depths - Colour stripping - Dissolution of meta-aramid fabric - Determination of colour fastness level - Determination of mechanical properties - RESULTS AND DISCUSSION : 3.1 Effect of the diazonium salt structure on the colour depth (K/S) - Effect of pretreatment on meta-aramid fabric characteristics - Role of methanol in the coloration process - Effect of the diazonium salt amount on the colour depth (K/S) - Effect of the coloration time on the colour depth (K/S) - Colour fastness - Colour stripping - Dissolution of meta-aramid fabric - Mechanical properties of coloured meta-aramid fabric - Coloration mechanism - Table 1 : Colour parameters of coloured meta-aramid fabrics - Table 2 : Fastness level of coloured meta-aramid fabrics - Table 3 : Mechanical data for coloured meta-aramid fabrics DOI : https://doi.org/10.1111/cote.12703 En ligne : https://drive.google.com/file/d/1427fYzy4bYl25AOmfVZSw9_Gn9cahX7R/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40392 [article]

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