| Titre : |
Influence of the association of hydrophobic end groups on the temperature insensitivity of HEUR-thickened latex/Fe2O3/Zn3(PO4)2/BaSO4 suspensions |
| Type de document : |
texte imprimé |
| Auteurs : |
Yating Lin, Auteur ; Chunmei Song, Auteur ; Xiong Xiao, Auteur ; Wan Bo, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 587-601 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Dispersions et suspensions
Formulation (Génie chimique)
Latex
Polymères -- Propriétés thermiques
Polymères -- Synthèse
Polyuréthane éthoxylé modifié de façon hydrophobe
Résistance thermique
Revêtements organiques
Rhéologie
Stabilité au stockage
Thixotropie
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Hydrophobically modified ethoxylated urethane (HEUR) with different structures was synthesized and confirmed by gel permeation chromatography, Fourier transform infrared spectroscopy and nuclear magnetic resonance (1H NMR). We propose the relationship between the temperature insensitivity model and the thickening mechanism of HEUR/latex/Fe2O3/Zn3(PO4)2/BaSO4 suspensions. Meanwhile, the temperature insensitivity of HEUR/C suspensions is the result of two main associations: intermolecular interactions bridging the hydrophobic tails of HEURs and the hydrophobic groups tightly adsorbing onto the latex particle surfaces. A smaller ratio of viscosity (Rv) at 1 s−1 from the steady state condition indicates the better temperature insensitivity of viscosity. The higher degree of crystallinity and rheological activation energy corresponds to a great extent with better temperature insensitivity due to stronger association. The temperature insensitivity is consistent with the longer hydrophobic chain, which was proven by hysteresis tests and oscillatory shear measurements. The storage stability was enhanced in the lockstep with a hydrophobic length of HEUR, which is consistent with the rougher surfaces of HEUR/C films. As an appealing method, the results are meaningful and instructive for coating storage and application. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Measurements - Synthesis of HEURs - Preparation of HEUR/C suspensions
- RESULTS AND DISCUSSION : Characterization of HEURs - Melting temperature and crystallinity of HEURs - Rheological behavior of HEUR/C suspensions - Storage stability and aggregation structure of HEUR/C suspensions
- Table 1 : Description of the coating formulation
- Table 2 : Molecular characteristics of polymers
- Table 3 : Thermoproperties and crystallization of HEUR
- Table 4 : Rheological properties of HEUR/C suspensions with different hydrophobicities
- Table 5 : Storage stability of HEUR/C suspensions
- Table 6 : Non-Newtonian exponents of HEUR/C suspensions
- Table 7 : Roughness parameters of the sample films |
| DOI : |
https://doi.org/10.1007/s11998-022-00692-0 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-022-00692-0.pdf?pdf=button% [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39301 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 587-601
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Influence of the association of hydrophobic end groups on the temperature insensitivity of HEUR-thickened latex/Fe2O3/Zn3(PO4)2/BaSO4 suspensions in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
