Biomordanting willow bark dye on cellulosic materials / Tia Lohtander in COLORATION TECHNOLOGY, Vol. 136, N° 1 (02/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 1 (02/2020) . - p. 4-14 Titre : Biomordanting willow bark dye on cellulosic materials Type de document : texte imprimé Auteurs : Tia Lohtander, Auteur ; Suvi Arola, Auteur ; Päivi Laaksonen, Auteur Année de publication : 2020 Article en page(s) : p. 4-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Analyse spectrale Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Chromatographie en phase liquide à hautes performances Colorants -- Absorption Colorants -- Adsorption Colorants végétaux Ecorces Etalonnage Extraction (chimie) Mordançage (teinture) Saules et constituants Teinture Index. décimale : 667.3 Teinture et impression des tissus Résumé : A semi-quantitative study of willow bark dye adsorption on two different cellulose materials using biomordants was carried out. The studied celluloses were microcrystalline cellulose (MCC) AaltoCell and regenerated Ioncell-F (IC) fibres. The dye was a hot water extract of willow bark and the adsorption to cellulose was carried out using carboxylic acid-containing biomordants, namely, oxalic acid, citric acid and tannic acid. Alum was employed as the reference mordant. A semi-quantitative estimation of the dye uptake was conducted using high-performance liquid chromatography equipped with a diode array detector and also by visual inspection, as well as an evaluation of the coloration using CIELab parameters. The mechanism of the dye adsorption on the cellulose surfaces was studied via Fourier Transform–infrared spectroscopy. According to the results, MCC had a higher affinity for polyphenolic dye than the regenerated cellulose fibres. Dye uptake on MCC was 50%-80% and 44%-57% on IC. For MCC, the biomordants improved the dye uptake more effectively than the control mordant, alum, whereas for IC the biomordants were less effective than alum. Note de contenu : - EXPERIMENTAL : Cellulose materials - Dye materials and chemicals - Dye extraction - Dyeing of cellulosic materials - Preparation of HPLC samples - Spectrophotometric measurements - HPLC-DAD-MS analysis - Calibration curves - Calculation of dye adsorption - RESULTS AND DISCUSSION : Spectrophotometric characterisation of WBE - Composition of the WBE solutions - Dyeing of cellulosic materials - Dye adsorption efficiency DOI : https://doi.org/10.1111/cote.12442 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12442 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33695 [article]

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Colour stability of wood coatings pigmented with natural indigo from Isatis tinctoria after accelerated weathering / Juha Jordan in COLORATION TECHNOLOGY, Vol. 138, N° 2 (04/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 2 (04/2022) . - p. 210-218 Titre : Colour stability of wood coatings pigmented with natural indigo from Isatis tinctoria after accelerated weathering Type de document : texte imprimé Auteurs : Juha Jordan, Auteur ; Roosa Helander, Auteur ; Päivi Laaksonen, Auteur Année de publication : 2022 Article en page(s) : p. 210-218 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Revêtements Bois -- Teinture Caractérisation Couleurs -- Stabilité Décoloration Essais accélérés (technologie) Indigo Pigments végétaux Revêtements -- Détérioration Index. décimale : 667.2 Colorants et pigments Résumé : An experimental study of artificial weathering of two outdoor coatings pigmented with natural indigo from Isatis tinctoria was carried out. The two coatings, natural indigo-pigmented boat varnish and outdoor paint, were exposed to cycles of ultraviolet light, water condensation and water spray for 40 days in a QUV test chamber. Synthetic indigo and commercial ultramarine pigment were employed as reference materials. The effects of artificial weathering on the coatings were evaluated with CIELab parameters, as well as visual inspection. Coating and pigment stability during artificial weathering were studied with reflectance spectrometry, hyperspectral imaging technology and Fourier Transform–infrared spectroscopy. According to the results, coatings with indigo proved to be more resistant to visual and spectral changes than unpigmented or commercially pigmented coatings. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation and testing - RESULTS - DISCUSSION : Colour changes and visual appearance - Pigment stability - Coating stability and ageing - Table 1 : Compositions of the coatings - Table 2 : Exposure cycle of the test. The cycle was repeated six times DOI : https://doi.org/10.1111/cote.12585 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12585 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37852 [article]

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