Polyurethaneurea aqueous dispersions prepared with diethyltoluenediamine as chain extender / Lin Jiang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 1 (03/2007)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 4, N° 1 (03/2007) . - p. 59-66 Titre : Polyurethaneurea aqueous dispersions prepared with diethyltoluenediamine as chain extender Type de document : texte imprimé Auteurs : Lin Jiang, Auteur ; Yong Lin Chen, Auteur ; Chun Pu Hu, Auteur Année de publication : 2007 Article en page(s) : p. 59-66 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère uréthane-urée Couches minces -- Propriétés mécaniques Diéthyl toluène diamine Dispersions et suspensions Résistance à l'humidité:Résistance à l'eau Index. décimale : 667.9 Revêtements et enduits Résumé : A series of polyurethaneurea (PUU) aqueous dispersions either with diethyltoluenediamine (DETDA) or ethylenediamine (EDA) as chain extender were prepared with polyester polyol, isophorone diisocyanate and dimethylol propionic acid (DMPA), and characterized. It was found that the physical properties of the PUU aqueous dispersions prepared with DETDA were similar to or better than those prepared with EDA. Compared with the EDA-extended waterborne PUU films, the water resistance and the mechanical properties of the DETDA-extended waterborne PUU films were enhanced appreciably; these enhancements are attributed to the strong hydrogen bonding in urea carbonyl groups and the ordered structure of hard segments in the systems. The DETDA-extended PUU film with 40 wt.% of hard segment and 4.0 wt.% of DMPA unit showed the lowest water-absorbing amount (2.6 wt.%) over all PUU films studied. The hydrophobic surface of the DETDA-extended PUU film modified with a small amount of aminoethylaminopropyl polydimethylsiloxane (AEAPS) was observed and its hydrophobicity was enhanced by increasing the AEAPS content further. DOI : 10.1007/s11998-007-9010-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9010-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3671 [article]

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Preparation and characterization of waterborne polyurethaneurea composed of C9-diol-based polyester polyol / Yun Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 3 (05/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 3 (05/2011) . - p. 419-425 Titre : Preparation and characterization of waterborne polyurethaneurea composed of C9-diol-based polyester polyol Type de document : texte imprimé Auteurs : Yun Zhu, Auteur ; Chun Pu Hu, Auteur Année de publication : 2011 Article en page(s) : p. 419-425 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère uréthane-urée Diols Polymères -- Séparation Polymères en émulsion Polyols Résistance à l'humidité Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Index. décimale : 667.9 Revêtements et enduits Résumé : A series of polyurethaneurea (PUU) aqueous dispersions were prepared with C9-diol-based polyester polyol (POA) and/or poly(neopentylene adipate) polyol (PNA). The particle size and viscosity of the PUU aqueous dispersions consisting of POA were close to those of a comparable system prepared with PNA, and the high-temperature stability and freeze–thaw stability for all the aqueous dispersions were excellent. The PUU film prepared only with the POA exhibited the lowest water-absorbing amount, the highest tensile strength (51.3 MPa), and the best hydrolytic stability across all PUU films studied. The experimental results also showed a high degree of hydrogen bonding for urea groups and a perfect, ordered structure of hard segments in this kind of PUU film, resulting in excellent water-resistance performance and mechanical properties. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the PUU aqueous dispersions - Characterization - RESULTS AND DISCUSSION : PUU aqueous dispersions DOI : 10.1007/s11998-010-9306-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9306-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11681 [article]

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