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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Hyperbranched polyurethanes with flammability resistance for leather retanning / Sheng Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 10 (10/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 10 (10/2022) . - p. 441-447 Titre : Hyperbranched polyurethanes with flammability resistance for leather retanning Type de document : texte imprimé Auteurs : Sheng Ding, Auteur ; Yiban Wu, Auteur ; Zhu Jinxing, Auteur ; Saiqi Tian, Auteur Année de publication : 2022 Article en page(s) : p. 441-447 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calorimétrie Caractérisation Cuirs et peaux -- Propriétés mécaniques Essais (technologie) Inflammabilité Mesure Polymères -- Synthèse Polymères ignifuges Polymères ramifiés Polyuréthanes Retannage Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this study, diethyl bis(2-hydroxyethyl) aminomethyl phosphonate was modified by hexamethylene diisocyanate, and then was utilized to partly replace the isocyanates to prepare hyperbranched polyurethanes (HPU-DPAs). The hyperbranched polyurethanes were then employed in the retanning process of wet blue. The shrinkage temperature, average thickness as well as mechanical properties of leather before and after retanning were acquired. The flammability of retanned leather was measured by cone calorimeter test. The morphologies of wet blue and leather after retanning by HPU-DAP were obtained using a scanning electron microscope. Results showed that the average thickness, tensile strength and elongation at break of leather were all improved after retanning. Retanning by HPU-DAPs can effectively increase flame retardancy of final leather. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperbranched polyurethand retanning agent (HPU) - Synthesis of hyperbranched polyurethane with flammability (HPU-DAP) - Retanning technology - Measurements - RESULTS AND DISCUSSION : Structure characterization - Application of FWPRA in retanning process - Flammability of retanned leather - Table 1 : Retanning process - Table 2 : GPC data, hydroxyl value as well as particle size of HPU and HPU-DPAs - Table 3 : Ts, average thickness and mechanical properties of leather - Table 4 : Main parameters from cone calorimeter test and vertical burning test DOI : https://doi.org/10.34314/jalca.v117i10.6184 En ligne : https://drive.google.com/file/d/1O_C0E7Ge3HR5Vt5IaW1eJee-K5ioerbX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38230 [article]

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A polyurethane-based retanning agent with fluorescent effect / Saiqi Tian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 4 (04/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 4 (04/2016) . - p. 148-154 Titre : A polyurethane-based retanning agent with fluorescent effect Type de document : texte imprimé Auteurs : Saiqi Tian, Auteur ; Peikun Zhang, Auteur ; Haojun Fan, Auteur ; Yi Chen, Auteur ; Jun Yan, Auteur ; Bi Shi, Auteur Année de publication : 2016 Article en page(s) : p. 148-154 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Fluorescence Polymères en émulsion Polyuréthanes Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel fluorescent waterborne polyurethane retanning agent (FWPRA) was prepared through chemically incorporation of fluorescer, disodium 4,4’-bis[4-anilino-6-hydroxyethylamino-6-(2-choloronilino-1,3,5-triazin-2-yl)amino]stilbene-2,2’-disulphonate (RSW), into polyurethane backbone as a chain extender. The chemical structure was characterized by FTIR, 1H NMR and UV?vis spectrophotometer, and fluorescence performances of FWPRA, RSW together with resultant leather were investigated systematically. The results indicate that polymerization has a positive effect on optical performance; FWPRA shows enhanced fluorescence intensity in comparison with fluorescer RSW. In the retanning process, no decay of optical performance can be found when chromium(III) salt and chestnut extract are used together, which reveals that FWPRA presents good fluorescence stability to other chemicals. For wet blue retanned by FWPRA, the shrinkage temperature, thickness as well as mechanical properties are improved. Most importantly, the resultant leather exhibits magic fluorescence effect under UV lamp. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of FWPRA - Measurements - RESULTS AND DISCUSSION : Chemical structure - Fluorescent properties - Stability of fluorescence - Application of FWPRA in retanning process En ligne : https://drive.google.com/file/d/1b8U8vIsnegH8LkAgZvugqssXGQ24hX6K/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25994 [article]

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