| Titre : |
Chemoenzymatic synthesis and characterization of urethane oils for surface coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Vilas D. Athawale, Auteur ; M. D. Bhabhe, Auteur |
| Année de publication : |
1998 |
| Article en page(s) : |
p. 43-48 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Two-step chemoenzymatic synthesis of urethane oils has been studied. Initially, the partial esters were prepared by lipase-catalyzed transesterification of soybean and linseed oils with n-butanol. Partial esters were further reacted with different diisocyanates to obtain urethane oils. The composition of the partial esters was varied with reaction time in the transesterification step. Among all the lipases, the lipozyme was found to be the most suitable lipase for the transesterification reaction, yielding 80-85%. All of the urethane oils were of low molecular weights irrespective of the type of oil used in their preparation. Urethane oils, based on MDI, exhibited the best scratch resistance. All of the urethane oils showed good acid and alkali resistance and excellent solvent resistance. These oils also satisfactorily passed the impact resistance and the flexibility tests. |
| Note de contenu : |
- EXPERIMENTAL : Chemicals and lipases - Two-step chemoenzymatic synthesis of urethane oils - Characterization of urethane oils - IR spectroscopy - 1H-NMR spectroscopy - Determination of film properties
- RESULTS AND DISCUSSION : Kinetics of lipase catalyzed transesterification of soybean and linseed oil - Effect of type of lipase - Effect of temperature - Effect of substrate to nucleophile radio - IR spectroscopy - 1H-NMR spectroscopy - Characterization and film properties of urethane oils |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17992 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 879 (04/1998) . - p. 43-48
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