| Titre : |
A novel hydroxyl polyacrylate latex modified by OvPOSS and its application in two-component waterborne polyurethane coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Wu Zeng, Auteur ; Haowei Huang, Auteur ; Liujun Song, Auteur ; Xiang Jiang, Auteur ; Xinya Zhang, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 181-191 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Caractérisation
Composés organiques -- Synthèse
Copolymérisation
Essai de dureté
Essai Wolff-Wilborn
Polyacrylates
Polymères à terminaison hydroxyle
Polyuréthanes
Revêtements -- Propriétés thermiques
Revêtements bi-composant
Revêtements organiques
Silsesquioxanes oligomères polyhèdres
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Octavinyl polyhedral oligomeric silsesquioxane (OvPOSS) was synthesized via hydrolysis and condensation of vinyltriethoxysilane. The structure of OvPOSS was determined by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), 1H nuclear magnetic resonance and 29Si nuclear magnetic resonance. A novel hydroxyl functional polyacrylate latex (HPA) with core–shell structure modified by OvPOSS (OvPOSS/HPA) was successfully prepared via emulsion copolymerization. Consequently two-component waterborne polyurethane (2K-WPU) coatings were prepared by using the as-prepared latex as hydroxyl components and hydrophilic polyisocyanates as curing agents. The structure and properties of OvPOSS/HPA were marked by FTIR, XRD, differential scanning calorimetry and thermogravimetric analysis. The results of FTIR and XRD show that OvPOSS has been successfully embedded into HPA, and OvPOSS occupies a homogeneous distribution in the HPA matrix. The effect of OvPOSS on the properties of OvPOSS/HPA as well as the application performance of 2K-WPU coatings film were also investigated. The results show that OvPOSS/HPA possesses core–shell structure with the OvPOSS core and enhanced thermal stability. The glass transition temperature (Tg) of OvPOSS/HPA with 2.0% OvPOSS content is 22.3°C, which is 8.4°C higher than that of pure HPA. The performance properties of the 2K-WPU coating films such as pencil hardness were also improved by incorporation of OvPOSS. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Synthesis of octavinyl-POSS (Ov POSS) - Synthesis of OvPOSS/HPA - Preparation of 2K-WPU coatings - Characterizations and instruments
- RESULTS AND DISCUSSION : Structure characterization of OvPOSS - Structure characterization of OvPOSS/HPA - Particle size distribution of OvPOSS/HPA - Thermal properties of OvPOSS/HPA films |
| DOI : |
10.1007/s11998-019-00256-9 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-019-00256-9.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33737 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 181-191
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