Excellent water resistance and mechanically robust waterborne polyurethane-acrylate based on dithiol post-chain extension / Zhiqiang Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 4 (07/2020) . - p. 1065-1074 Titre : Excellent water resistance and mechanically robust waterborne polyurethane-acrylate based on dithiol post-chain extension Type de document : texte imprimé Auteurs : Zhiqiang Liu, Auteur ; Hongxiang Chen, Auteur ; Gang Hu, Auteur ; Jun Wang, Auteur ; Yufei Xin, Auteur ; Chuanxi Xiang, Auteur ; Yu Zhou, Auteur Année de publication : 2020 Article en page(s) : p. 1065-1074 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère uréthane acrylate Polymères en émulsion Résistance à l'humidité:Résistance à l'eau Résistance à la traction Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : There is a trade-off between water resistance and mechanical properties of the waterborne polyurethane film. Aiming to solve this problem, the waterborne polyurethane-acrylate (WPUBH) was prepared by post-chain extension of dithiol instead of diamine, which could improve the storage stability and reduce the water absorption rate due to the absence of urea groups, and by terminating with hydroxyethyl acrylate, which could reduce the water absorption rate and improve the mechanical properties at the same time deriving from the crosslinking of double bonds after heating. The rate of water absorption for WPUBH-2 film decreased down to 2.87%, and the tensile strength reached 8.5 MPa. The water resistance and the mechanical properties of WPUBH obtained a good balance compared with those of the carboxylate-based waterborne polyurethane-acrylate in the previous reports. They had excellent bonding properties for wood joints, and the tensile shear strength was up to 4.53 MPa. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of waterborne polyurethane-acrylate emulsion - Instruments and characterization methods - RESULTS AND DISCUSSION : Preparation of WPUBH emulsion - The structure of WPUBH - The performance of WPUBH DOI : https://doi.org/10.1007/s11998-020-00332-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00332-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34393 [article]

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Synthesis and characterization of waterborne polyurethane thickeners based on hyperbranched polyester / Andong Xie in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 2 (03/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 2 (03/2015) . - p. 325-331 Titre : Synthesis and characterization of waterborne polyurethane thickeners based on hyperbranched polyester Type de document : texte imprimé Auteurs : Andong Xie, Auteur ; Hongxiang Chen, Auteur ; Caixia Xu, Auteur ; Hailun Chen, Auteur ; Yu Zhou, Auteur ; Yinli Lin, Auteur ; Minghua Yang, Auteur Année de publication : 2015 Article en page(s) : p. 325-331 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Epaississants Polymères -- Synthèse Polymères en émulsion Polymères ramifiés Polyuréthanes Index. décimale : 667.9 Revêtements et enduits Résumé : Octahydroxyl-terminated and hexadecahydroxyl-terminated hyperbranched polyesters (HPE-8 and HPE-16) were synthesized from 2,2-dimethylol propionic acid and 1,4-butanediol. The hyperbranched waterborne polyurethane (HWPU) thickeners containing different branching structure and length of hydrophilic chain were prepared with hexamethylene diisocyanate, polyethylene glycol (PEG), cetyl alcohol, and HPE. The structures of HPE and HWPU were characterized by Fourier transform infrared spectra and nuclear magnetic resonance (1H NMR and 13C NMR). The rheological properties of polyurethane emulsion thickened by HWPU were measured using Brookfield LVDV-III rheometer, and the effects of HPE structure and PEG molecular weight on the thickening property of HWPU were studied. The results showed that HWPU with HPE branching number of 8 and PEG molecular weight of 4000 exhibited an excellent thickening effect in the aqueous polyurethane emulsion Note de contenu : - EXPERIMENTAL : Materials - Synthesis of HPE-6 and HPE-12 - Synthesis of HWPU-X-Y - Characterization and measurements - RESULTS AND DISCUSSION : Structural characterization of HPE-8 and HPE-16 - Structural characterization of HWPU - The influence of branching number on the thickening property of HWPU - The influence of PEG molecular weight on the thickening property of HWPU DOI : 10.1007/s11998-014-9636-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9636-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23651 [article]

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