Textile applications of commercial photochromic dyes. Part 6 : photochromic polypropylene fibres / Anna F Little in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)  

[article]  inCOLORATION TECHNOLOGY > Vol. 132, N° 4 (08/2016) . - p. 304-309 Titre : Textile applications of commercial photochromic dyes. Part 6 : photochromic polypropylene fibres Type de document : texte imprimé Auteurs : Anna F Little, Auteur ; Robert M. Christie, Auteur Année de publication : 2016 Article en page(s) : p. 304-309 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Colorants photochromiques 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). Extrusion filage Naphtopyranne Photostabilité Polypropylène Sérigraphie Spirooxazine Stabilisants (chimie) Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Two commercial photochromic dyes, a spirooxazine and a napthopyran, were successfully incorporated into polypropylene fibres by melt extrusion to produce fibres that showed intense photochromism. The technical performance of the photochromic dyes was investigated using a methodological approach that has been established and validated for the dyes applied by screen printing onto textiles in previous publications in this series. These parallel investigations allowed a comparison of the properties of the dyes in polypropylene and screen printed on cotton. The photocolorability of both dyes was found to be significantly higher in polypropylene compared with screen prints on cotton when applied at the same dye concentration. Of particular interest was the observation of positive solvatochromism, providing evidence that the photochromism is due to the colorants in solution in both media. The colour development rates during UV exposure of the dyes applied by screen printing cotton and by extrusion into polypropylene were similar. However, differences were observed in the thermal fading rates after removal of the UV source, in that the spirooxazine dye reverted more slowly in polypropylene, while the reverse was true in the case of the naphthopyran. Both dyes showed better photostability in polypropylene than in screen-printed textiles. A UV absorber and two hindered amine light stabilisers were found significantly to enhance the photostability of the dyes in polypropylene, although the presence of the UV absorber reduced the degree of photocoloration. Note de contenu : - Instrumentation and equipment - Photostability - Materials and application methodology DOI : 10.1111/cote.12221 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12221 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26732 [article]

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Textile applications of photochromic dyes. Part 3 : factors affecting the technical performance of textiles screen-printed with commercial photochromic dyes as disperse dyes to polyester by exhaust dyeing / Anna F Little in COLORATION TECHNOLOGY, Vol. 127, N° 5 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 5 (2011) . - p. 275-281 Titre : Textile applications of photochromic dyes. Part 3 : factors affecting the technical performance of textiles screen-printed with commercial photochromic dyes as disperse dyes to polyester by exhaust dyeing Type de document : texte imprimé Auteurs : Anna F Little, Auteur ; Robert M. Christie, Auteur Année de publication : 2011 Article en page(s) : p. 275-281 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Colorimétrie Naphthopyranes Nettoyage Photochromisme Photostabilité Pigments à effets spéciaux Pigments photochromiques Spirooxazine Teinture -- Fibres textiles Textiles et tissus Index. décimale : 667.3 Teinture et impression des tissus Résumé : The technical performance of five selected commercial photochromic dyes applied by screen-printing on textiles was evaluated using a colour measurement methodology that has previously been established and validated. The results of wash fastness assessments were distinctly unusual. With the selected spirooxazine dyes, the degree of photocoloration increased with initial washing and decreased with subsequent washings, while the naphthopyrans behaved more normally, showing a consistent marginal decrease in photocoloration with repeated washing. An explanation is proposed consistent with scanning electron microscopy examination of the binder film degradation and with the structural differences between the dye classes. The dyes in this application showed limited photostability. The incorporation of ultraviolet absorbers was found to increase photostability only to an extent specific to particular ultraviolet absorber/dye combinations. However, the presence of the ultraviolet absorber led to a consistent reduction in the degree of photocoloration of the dyes. In contrast, the incorporation of hindered amine light stabilisers significantly enhanced the photostability of the dyes, providing an increase in resistance to photodegradation of up to fivefold. Note de contenu : - Instrumental methods - Materials - Screen-printing - Wash fastness test - Photostability test DOI : 10.1111/j.1478-4408.2011.00307.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00307.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12003 [article]

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Textiles screen-printed with photochromic ethyl cellulose–spirooxazine composite nanoparticles in COLORATION TECHNOLOGY, Vol. 129, N° 1 (02/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 1 (02/2013) . - p. 18-23 Titre : Textiles screen-printed with photochromic ethyl cellulose–spirooxazine composite nanoparticles Type de document : texte imprimé Année de publication : 2013 Article en page(s) : p. 18-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 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). Nanoparticules Pâtes d'impression Photochromes Photochromisme Sérigraphie Spirooxazine Teinture -- Fibres textiles Textiles et tissus imprimés Index. décimale : 667.3 Teinture et impression des tissus Résumé : Photochromic compounds change colour on exposure to light, while the reversion may be attributable either to radiation or may be thermal. The use of photochromism on fabrics can provide new opportunities to develop smart textiles; for example, sensors and active protective clothes. Ethyl cellulose-1,3-dihydro-1,3,3,4,5 (and 1,3,3,5,6) -pentamethyl-spiro-[2H-indole-2,3′-(3H)naphtha(2,1-b)(1,4)oxazine] composites were prepared by an oil-in-water emulsion, solvent evaporation method in order to form easily suspendable and fatigue-resistant photochromic nanoparticles in screen-printing paste. Their size was well below 1 μm and did not change substantially over a wide range of dye concentrations. After screen-printing, a homogenous photochromic layer was built on a cotton substrate surface, which represented substantial blue colour development in CIELab colour space measurements because of ultraviolet light, even at a dye concentration of 0.045% w/w. The addition of a photodegradation inhibitor, Tinuvin 144, further increased the coloration of the printed fabric. Note de contenu : - EXPERIMENTAL : Materials - Preparation of photochromic nanocapsules - Preparation of the printing pastes, printing and fixation process - Measuring methods - RESULTS AND DISCUSSION : Size of photochromic nanoparticles - Spectral characteristics of UV source and photochromic nanoparticle dispersions - Characteristics of prints containing photochromic nanocapsules - Evaluation of the photochromic fabrics DOI : 10.1111/j.1478-4408.2012.00404.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00404.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17182 [article]

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