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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