Interaction of N-methylformanilide with high-performance polyimide fibre and its effect on dyeing / Dongyan Shao in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 407-416 Titre : Interaction of N-methylformanilide with high-performance polyimide fibre and its effect on dyeing Type de document : texte imprimé Auteurs : Dongyan Shao, Auteur ; Jinmei Du, Auteur ; Changhai Xu, Auteur ; Hongbo Wang, Auteur Année de publication : 2022 Article en page(s) : p. 407-416 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation N-méthylformanilide Polyimides Teinture -- Fibres textiles synthétiques Traitement thermique Index. décimale : 667.3 Teinture et impression des tissus Résumé : High-performance polyimide fibre is well known for its outstanding thermal stability, fire resistance and chemical stability, and it has great potential for use in fire-protective textiles. One major drawback of polyimide fibre is that it is difficult to dye under regular conditions. In this work, it was found that polyimide fibre could be dyed with disperse dyes with the assistance of N-methylformanilide. Thus, it was proposed that there might exist an interaction between polyimide fibre and N-methylformanilide that plays an important role in dyeing. Experimental results showed that N-methylformanilide penetrated into polyimide fibre, resulting in a slight swell in diameter and decrease in the breaking strength of polyimide fibre. X-ray diffractometric data showed no apparent solvent-introduced increase on the crystallinity of polyimide fibres but an orderly change on the interplanar spacing. When N-methylformanilide was removed from polyimide fibre by thermal treatment, the diameter, breaking strength and interplanar spacing of the polyimide fibres were all recovered to some extent. This indicated that the interactions between polyimide macromolecular chains were broken because of the penetration of N-methylformanilide, and new interactions occurred between polyimide macromolecular chains and N-methylformanilide that played a role in lubricating dye molecules to diffuse into polyimide fibres. Note de contenu : - MATERIALS AND METHODS : Materials - Dyeing of PI fibres - PI fibres treated with MFA - Thermal treatment of PI fibres - Characterisation - RESULTS AND DISCUSSION : Dyeing properties of PI fibres with MFA - Effect of MFA on PI fibre - Thermal treatment of MFA-treated PI fibre - Swelling mechanism - Table 1 : Parameters of XRD patterns of PI fibres DOI : https://doi.org/10.1111/cote.12602 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12602 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37893 [article]

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Synthesis of N-[4-(dimethylalkylammoniomethyl) benzoyl]caprolactam chlorides as cationic bleach activators for low-temperature bleaching of cotton fabric under near-neutral pH conditions / Dong Wei in COLORATION TECHNOLOGY, Vol. 130, N° 6 (12/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 6 (12/2014) . - p. 432-436 Titre : Synthesis of N-[4-(dimethylalkylammoniomethyl) benzoyl]caprolactam chlorides as cationic bleach activators for low-temperature bleaching of cotton fabric under near-neutral pH conditions Type de document : texte imprimé Auteurs : Dong Wei, Auteur ; Chang Sun, Auteur ; Mengze Wang, Auteur ; Jinmei Du, Auteur ; Changhai Xu, Auteur Année de publication : 2014 Article en page(s) : p. 432-436 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de blanchiment Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Index. décimale : 667.3 Teinture et impression des tissus Résumé : Low-temperature bleaching of cotton fabric can be achieved by incorporating a so-called bleach activator into an aqueous solution of hydrogen peroxide. In this study, a series of N-[4-(dimethylalkylammoniomethyl)benzoyl]caprolactam chlorides were synthesised for use as cationic bleach activators with various alkyl chain lengths. All these synthesised cationic bleach activators were confirmed by 1H and 13C nuclear magnetic resonance spectroscopy and mass spectroscopy. Bleaching experiments revealed that these synthesised bleach activators were effective for bleaching of cotton fabric at 50 °C under near-neutral pH conditions, but the alkyl chain lengths had a great influence on their bleaching performance. Increasing the alkyl chain length from 2 to 6 carbon atoms could slightly enhance bleaching performance, while increasing the alkyl chain length from 8 to 16 carbon atoms markedly reduced bleaching performance. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of cationic bleach activators with various chain lengths - Bleaching of cotton fabric - RESULTS AND DISCUSSION : Synthesis of cationic bleach activators - Bleaching performance DOI : 10.1111/cote.12116 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12116 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22505 [article]

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