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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Water-compatible, pH-sensitive, colour-changing polyurethane with low-temperature flexibility / Yong-Chan Chung in COLORATION TECHNOLOGY, Vol. 133, N° 3 (06/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 3 (06/2017) . - p. 252 Titre : Water-compatible, pH-sensitive, colour-changing polyurethane with low-temperature flexibility Type de document : texte imprimé Auteurs : Yong-Chan Chung, Auteur ; In-Hong Jung, Auteur ; Byoung Chul Chun, Auteur Année de publication : 2017 Article en page(s) : p. 252 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Basses températures Compatibilité chimique et physique Eau Effet mémoire de forme Fibres textiles -- Propriétés mécaniques Greffage (chimie) pH Polymères -- Synthèse Polyuréthanes Propionique diméthylol, Acide Stabilité thermique Index. décimale : 667.3 Teinture et impression des tissus Résumé : A pH indicator (Bromocresol Green, Bromocresol Purple, or Thymol Blue) is grafted onto polyurethane (PU) using 2,2-dimethylolpropanoic acid (DMPA) to enhance water compatibility. The indicator-grafted, water-compatible PU is analysed for soft-segment thermal, tensile, and shape recovery properties, fast colour change depending on various pH conditions, and low-temperature flexibility. The PU surface becomes water compatible as DMPA content increases, and the characteristic UV-vis absorbance is observed for each grafted indicator. The PU series exhibits a sharp increase in tensile stress and crosslink density at low DMPA content, but a decrease with increased DMPA content. The glass transition temperature increases significantly with increased DMPA content. Shape recovery remains high, but shape retention sharply decreases after an indicator is grafted. The grafting of pH indicator onto PU improves the low-temperature flexibility and imparts an immediate colour change according to the solution pH and grafted indicator. Note de contenu : - EXPERIMENTAL : Materials - Polymer synthesis - Characterisation - Shape memory and low-temperature flexibility test - RESULTS AND DISCUSSION : Synthesis and structure of PU - IR and thermal analysis - Crosslink density and tensile mechanical properties - Shape memory effect - pH indication and low-temperature stability DOI : 10.1111/cote.12275 En ligne : https://drive.google.com/file/d/1E7GPPiFYnqxU63YQvN_p0piCEs65Clvb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28649 [article]

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