Characterisation and application of polyurethane copolymers grafted with photoluminescent dyes / Yong Chan Chung in COLORATION TECHNOLOGY, Vol. 130, N° 4 (08/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 4 (08/2014) . - p. 305-313 Titre : Characterisation and application of polyurethane copolymers grafted with photoluminescent dyes Type de document : texte imprimé Auteurs : Yong Chan Chung, Auteur ; Kiseok Yang, Auteur ; Jae Won Choi, Auteur ; Byoung Chul Chun, Auteur Année de publication : 2014 Article en page(s) : p. 305-313 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Caractérisation Colorants Copolymères -- Propriétés mécaniques Copolymères -- Synthèse Copolymères greffés Effet mémoire de forme Electrofilature Essais (technologie) Essais dynamiques Photoluminescence Polyuréthanes Traction (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : Photoluminescent dyes (aminofluorene, naphthalimide, naphtholbenzein, or phenosafranine) were grafted to polyurethane using an allophanate linkage. The photoluminescence properties and the shape recovery effects of polyurethane samples were investigated. The polyurethane was composed of 4,4?-methylenebis(phenylisocyanate), poly(tetramethyleneglycol), and 1,4-butanediol. The dyes were linked through an extra 4,4?-methylenebis(phenylisocyanate) and the carbamate moiety of the polyurethane chains. Polyurethanes with various dye contents were characterised, and the shape recovery and photoluminescence properties were compared. In the case of the tensile mechanical properties, the highest maximum stress was 56 MPa, and the strain remained > 1500% for the entire series. The shape recovery improved as the test cycle was repeated, with up to 100% recovery being achieved, but shape retention decreased as the dye content increased. Finally, the photoluminescence of the polyurethanes was demonstrated by a luminescent light-emission test, together with pH indication capability and the preparation of non-woven fibre using the electrospinning method. Note de contenu : - EXPERIMENTAL : Materials - Polymer synthesis - Crosslink density - Electrospinning - Characterisation - Shape-memory test - RESULTS AND DISCUSSION : Synthesis and structure of PU - IR and thermal analysis - Crosslink density and viscosity - Tensile mechanical properties - Shape-memory effect - Luminescence of PU - Electrospinning DOI : 10.1111/cote.12097 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12097 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21783 [article]

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