| Titre : |
Chemoenzymatic synthesis of PURs |
| Type de document : |
texte imprimé |
| Auteurs : |
Vilas D. Athawale, Auteur ; K. R. Joshi, Auteur |
| Année de publication : |
2000 |
| Article en page(s) : |
p. 42-46 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Interesterification of castor oil and linseed oil was carried out at near ambient temperature by using lipase as a catalyst as against at higher temperatures (220 °-230 °C) employed in chemically catalyzed interesterification reactions. The resultant interesterification product that formed was reacted with toluene di-isocyanate to form polyurethanes. Polyurethanes synthesized by this method were light in color compared to the conventional ones. A significant improvement in the hardness, adhesion, impact resistance, chemical resistance and color was achieved over that of the commercially available polyurethanes when the lipase was used in the first step of the synthesis of the polyurethanes. |
| Note de contenu : |
- Using lipase as a catalyst to avoid difficulties
- Enzymatic interesterification of castor oil and linseed oil : Synthesis of polyurethane resins based on interesterification product
- Coating properties pf polyurethane resins : Hardness - Adhesion - Storage stability - Impact resistance - Chemical resistance
- Results and discussion : Position selective reactions with enzyme catalyzed interesterification - IR spectroscopy shows spectra of conventional polyurethanes - To improve hardness with increase of LO in IP - 100 % adhesion - Storage stability depends on CO and LO composition in the IP. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11007 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 6/00 (06/2000) . - p. 42-46
Aller sur edunet
Accueil
Chemoenzymatic synthesis of PURs in EUROPEAN COATINGS JOURNAL (ECJ), N° 6/00 (06/2000)
