| 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
CotonLe 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 |
in COLORATION TECHNOLOGY > Vol. 132, N° 4 (08/2016) . - p. 304-309
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