| Titre : |
Phenyl carbamate end-capped oligoesters : a model for hydrolytic stability of ester-based urethanes |
| Type de document : |
texte imprimé |
| Auteurs : |
Mayela Ramirez-Huerta, Auteur ; Irina J. Zvonkina, Auteur ; Mark D. Soucek, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 781-793 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Composés aliphatiques
Composés organiques -- Synthèse
Hydrolyse
HydroxyleEn chimie organique, un hydroxyle (ou oxhydryle) peut désigner deux entités.
Un groupement -OH, appelé aussi hydroxy, qui se rencontre en particulier dans les alcools et les phénols.
Un radical : HO^{\bullet}. Il est produit par exemple lors de réactions de dissociation de peroxydes, en présence d'ions de métaux de transition (Fe(II), Cu(I), réaction de Fenton), de chauffage ou de rayonnement.
Isocyanate de phényle
Oligomères
Polyesters
Polymères -- Détérioration
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
A series of hydroxyl-terminated oligoesters were synthesized to determine the structural effects on the relative rates of hydrolysis in both acidic and alkaline media. Model compounds consisting of one diol and one dibasic acid were used because the simplicity of the chemical structure allowed for the analysis of individual effects. Linear, cycloaliphatic, and aromatic dibasic acids were used. The diacids were reacted with a series of linear and bulky diols. All hydroxyl-terminated oligoesters were end-capped with phenyl isocyanate. Three different stages were distinguished in the case of aliphatic oligoesters, while more bulky structures (cycloaliphatic and aromatics) only presented one or two stages. Hydrolysis rates showed a complex behavior where steric and anchimeric effects play a mutual role on initial hydrolysis rates. |
| Note de contenu : |
- Materials
- Synthesis of the hydroxyl-terminated oligoesters
- Synthesis of the urethane end-capped oligoesters
- Characterization of the end-capped oligoesters
- Sample preparation and acid number evaluation
- Acid number evaluation (Aac)
- Gel permeation chromatography (GPC)
- Linear aliphatic- and cycloaliphatic-based oligoesters
- Aromatic-based oligoesters |
| DOI : |
10.1007/s11998-016-9798-0 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9798-0.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27115 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 781-793
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Phenyl carbamate end-capped oligoesters : a model for hydrolytic stability of ester-based urethanes in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)
