A diverse color-tunable luminous polyurethane leather coating based on long persistent phosphors and photochromic spiropyrans / Saiqi Tian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 4 (04/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 4 (04/2019) . - p. 138-145 Titre : A diverse color-tunable luminous polyurethane leather coating based on long persistent phosphors and photochromic spiropyrans Type de document : texte imprimé Auteurs : Saiqi Tian, Auteur ; Zhe Sun, Auteur ; Haojun Fan, Auteur ; Jun Yan, Auteur Année de publication : 2019 Article en page(s) : p. 138-145 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Caractérisation Couleur -- Analyse Cuir Fluorescence Polyuréthanes Revêtements organiques Spyropyrane Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A diverse color-tunable luminous polyurethane leather coating (CLPU) which can reversibly change color as well as fluorescent emission through the UV-vis or UV-darkness circle was prepared, via covalent incorporation of amino-functionalized phosphors and photochromic 1-(2-Hydroxyethyl)-3,3-Dimethylindolino-6’-nitrobenzopyrylospiran (SP). X-Ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis absorption spectra, reflectance spectra, fluorescent spectra as well as the migration percentage were measured to characterize the resultant samples structure and properties. In daylight, CLPU appears white before 365 UV irradiation and violet after UV irradiation, due to the transition of the spiro forms of spiropyran to merocyanine forms. In darkness, CLPU emits intense green light before UV irradiation, and the light changes to orange after UV irradiation, due to the phosphors showing pleasant diverse color-tunable luminous effect. Note de contenu : - EXPERIMENTAL : Materials - Preparation of CLPU - PU and PU/SP preparation - Film and leather preparation - Characterization - RESULTS AND DISCUSSION : Structure analysis - Coloration and de-coloration process - Fluorescent properties - Diverse color-tunable luminous effect - Thermal migration properties En ligne : https://drive.google.com/file/d/1-LBKUUq7Fx44CKYyVNl40nzYZkTz8UdY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32275 [article]

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Influence of stabilizer additives on thermochromic coating for temperature monitoring / Aline Vieira de Souza in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 6 (11/2016) . - p. 1139-1144 Titre : Influence of stabilizer additives on thermochromic coating for temperature monitoring Type de document : texte imprimé Auteurs : Aline Vieira de Souza, Auteur ; Alexsandra Valério, Auteur ; Jonatan Lincoln Oliveira Buske, Auteur ; Mauro Eduardo Benedet, Auteur ; Vinicius Pistor, Auteur ; Ricardo Antônio Francisco Machado, Auteur Année de publication : 2016 Article en page(s) : p. 1139-1144 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère uréthane acrylique Matériaux -- Détérioration Matériaux intelligents Revêtements -- Additifs:Peinture -- Additifs Spyropyrane Stabilisants (chimie) Thermochromie Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Compounds based on smart materials are functional structures that can be used as thermochromic sensors for temperature monitoring in equipment such as pipelines, motors, and heat exchangers. We developed thermochromic coatings based on 1,3,3-trimethylindolino-β-naphthopyrylospiran acrylic polyurethane with and without 2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol photostabilizer additives and antioxidant butylated hydroxytoluene and applied them on stainless-steel plates by the spray lay-up method. The samples were analyzed using a weathering chamber with UVA and UVB radiation to monitor their degradation process, revealing complete degradation of the coating without antioxidant and photostabilizer, leading to loss of its thermochromic characteristic. Note de contenu : - Thermodynamic coating preparation - Thermogravimetric analysis (TGA) - Weathering chamber analysis - Color analysis DOI : 10.1007/s11998-016-9811-7 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9811-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27275 [article]

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