Effect of polyether soft segments on structure and properties of waterborne UV-curable polyurethane nanocomposites / Shengwen Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 3 (05/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 3 (05/2015) . - p. 563-569 Titre : Effect of polyether soft segments on structure and properties of waterborne UV-curable polyurethane nanocomposites Type de document : texte imprimé Auteurs : Shengwen Zhang, Auteur ; Jianfeng Chen, Auteur ; Dan Han, Auteur ; Yongqi Feng, Auteur ; Chen Shen, Auteur ; Chen Chang, Auteur ; Zhilin Song, Auteur ; Jie Zhao, Auteur Année de publication : 2015 Article en page(s) : p. 563-569 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Emulsions inverses Gel de silice Nanoparticules Oxyde de polyphénylène Polyéthers Polyéthylène glycol Polymères en émulsion Polyoxytétraméthylène glycol Polypropylène glycol Polyuréthanes Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne UV-curable polyurethane (WUPU)/silica nanocomposites were prepared using three types of polyether (PEO-PPO-PEO, PPG, and PTMG) and aqueous colloidal silica by phase-inversion emulsification. The PEO-PPO-PEO and PPG-WUPU nanocomposite dispersions exhibited smaller particles and higher viscosity than their pure WUPU dispersions, whereas PTMG-WUPU nanocomposite dispersion exhibited larger particles and higher viscosity than its pure WUPU dispersion. The SEM analysis indicated that the continuous silica clusters network was distributed in the PEO-PPO-PEO-WUPU matrix, whereas the separate silica clusters were dispersed in the PPG and PTMG-WUPU matrix, respectively. The DMA analysis demonstrated that a slight narrowing of the peak in tanδ and a shift in T g toward lower temperature were observed for the WUPU nanocomposite films with PEO-PPO-PEO and PPG. Conversely, the PTMG-WUPU nanocomposite film showed the insensitivity of the soft segment glass transition (T g) peak positions, supporting preferential attraction of the silica nanoparticles to the highly polar hard segments. The WUPU nanocomposite films showed increased storage modulus, Young’ modulus, and tensile strength. However, for toughness, only the PTMG-WUPU nanocomposite film exhibited great improvement when compared to its pure film due to the silica nanoparticles preferential, but not exclusive, interaction with the hard segment of WUPU. Note de contenu : - EXPERIMENTAL : Materials - Preparation of WUPU/silica nanocomposite dispersions - Testing methods - RESULTS AND DISCUSSION : Colloidal properties of WUPU/silica nanocomposite dispersions - Silica nanoparticles dispersion and morphology - Mechanical properties of the WUPU/silica nanocomposite fims DOI : 10.1007/s11998-014-9654-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9654-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24180 [article]

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