| Titre : |
Interfacial studies of crosslinked urethanes : part II. The effect of humidity on waterborne polyurethanes ; a spectroscopic study |
| Type de document : |
texte imprimé |
| Auteurs : |
Anneke M. Kaminski, Auteur ; Marek W. Urban, Auteur |
| Année de publication : |
1997 |
| Article en page(s) : |
p. 113-121 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
In this study we examined isocyanate crosslinking reactions at the film-air (F-A) and film-substrate (F-S) interfaces of waterborne two-component (2K) urethanes as a function of depth and relative humidity (RH) using attenuated total reflectance (ATR) FTIR spectroscopy. Analysis of water/isocyanate reactions revealed urea formation which further interacts with water via H-bonding. Quantitative analysis of isocyanate consumption showed that the rates of film formation for waterborne polyurethanes are faster than equivalent solvent-borne polyurethanes. These studies showed that isocyanate consumption increases at high relative humidities. Examination of isocyanate consumption as a function of depth from the F-A and F-S interfaces showed that the isocyanate concentration increases when going from 0.65 to 1.14 ?m. |
| Note de contenu : |
- EXPERIMENTAL : Sample preparation - Analytical methods
|
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18284 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 873 (10/1997) . - p. 113-121
Aller sur edunet
Accueil
Interfacial studies of crosslinked urethanes : part II. The effect of humidity on waterborne polyurethanes ; a spectroscopic study in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 873 (10/1997)
