Steady rheological behaviors of UV-curable waterborne hyperbranched polyurethane acrylate dispersions / Wenhua Yin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 1 (01/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 1 (01/2013) . - p. 57-64 Titre : Steady rheological behaviors of UV-curable waterborne hyperbranched polyurethane acrylate dispersions Type de document : texte imprimé Auteurs : Wenhua Yin, Auteur ; Xingrong Zeng, Auteur ; Hongqiang Li, Auteur ; Xiaodan Lin, Auteur ; Biye Ren, Auteur ; Zhen Tong, Auteur Année de publication : 2013 Article en page(s) : p. 57-64 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dispersions et suspensions Polyacrylates Polymères ramifiés Polyuréthanes Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : A rotational rheometer was used to investigate the steady rheological behaviors of UV-curable waterborne hyperbranched polyurethane acrylate dispersions (WHBPUADs). The flow curves of WHBPUADs were fitted mathematically using the Cross model. The effects of many factors including solid content, concentration of hydrophilic groups, and degree of neutralization on the rheological behaviors were studied and discussed. It was found that the viscosity of WHBPUAD decreased with increasing shear rate, indicating that WHBPUAD was pseudoplastic. On the other hand, at the same shear rate, the viscosity of WHBPUAD increased with increasing solid content and degree of neutralization but decreased with increasing concentration of hydrophilic groups. The Cross model could describe the flow curve of WHBPUAD accurately, with square of correlation coefficient (R 2) above 0.9. Moreover, most of the zero-shear viscosity values (? 0) obtained by the Cross model were located in the range of 0.2–10 Pa·s, which could fully meet the practical application requirement. Note de contenu : - EXPERIMENTAL : Materials - Characterization (particle size measurement - Rheological measurements) - RESULTS AND DISCUSSION : Effect of solid content - Effect of concentration of hydrophilic groups - Effect of degree of neutralization DOI : 10.1007/s11998-012-9432-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9432-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17472 [article]

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Synthesis, photopolymerization kinetics, and thermal properties of UV-curable waterborne hyperbranched polyurethane acrylate dispersions / Wenhua Yin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 577-584 Titre : Synthesis, photopolymerization kinetics, and thermal properties of UV-curable waterborne hyperbranched polyurethane acrylate dispersions Type de document : texte imprimé Auteurs : Wenhua Yin, Auteur ; Xingrong Zeng, Auteur ; Hongqiang Li, Auteur ; Youjun Hou, Auteur ; Qiongzhi Gao, Auteur Année de publication : 2011 Article en page(s) : p. 577-584 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages. Cinétique chimique Fourier, Spectroscopie infrarouge à transformée de Photoréticulation Polymères ramifiés Polyuréthanes Réticulation (polymérisation) Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : A series of UV-curable waterborne hyperbranched polyurethane acrylate dispersions (WHBPUADs) were prepared via a three-step procedure based on isophorone diisocyanate (IPDI), hyperbranched polyester (HBP), maleic anhydride (MA), and hydroxy-ethyl acrylate (HEA). The structure of WHBPUADs was characterized by Fourier transform infrared spectroscopy (FTIR) and 1H nuclear magnetic resonance spectroscopy (1H NMR). FTIR was also applied to research the effect of double bond concentration on the kinetics of photopolymerization. The heat resistance of the cured films was characterized by thermogravimetric analysis (TGA), and their mechanical properties were also measured. The results showed that the double bond conversion (Ï„) and photopolymerization rate (R p) were affected by the concentration of double bond and viscosity of WHBPUADs. The UV-curable systems with higher double bond concentration and lower viscosity led to higher Ï„ and R p. The maximum Ï„ and R p reached 93% and 71 mmol g−1 s−1, respectively. The WHBPUADs films possessed better heat resistance and mechanical properties, and with the increase of crosslink density, the heat resistance and hardnesses were further improved. Note de contenu : EXPERIMENTAL : Materials - Synthesis of WHBPUADs RESULTS AND DISCUSSION : FTIR of WHBPUAD - 1H NMR spectrum of WHBPUAD - Photopolymerization kinetics - Film mechanical properties of WHBPUADs - TGA of cured films of WHBPUADs DOI : 10.1007/s11998-011-9338-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9338-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12233 [article]

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