Lignins as macromonomers for polyesters and polyurethanes
- EFPG Martin d`Heres (France)
Lignins of different vegetal origin and from different delignification processes bear the common essential feature of containing both phenolic and aliphatic hydroxy groups, albeit in different total amounts and relative proportions. The present study reports the use of several lignins as polyfunctional oligomers for the direct elaboration of polyesters and polyurethanes, through their condensation reactions with acid chlorides and isocyanates, respectively. In the syntheses of polyesters the reagents were aliphatic and aromatic dichlotides and oligoethylene oxide glycols of different DP`s were added as chain extenders. The conditions were optimized and the ensuing networks thoroughly characterized. Two types of polyurethanes were prepared, namely thermoplastic structures arising from the reaction of lignins with oligoethylene oxide monoisocyanates and crosslinked products obtained from similar polycondensations, but with oligoethylene oxide diisocyanates. The properties of all these materials were examined in relation to their structural peculiarities and assessed in the light of possible applications.
- OSTI ID:
- 370048
- Report Number(s):
- CONF-960376-; TRN: 96:003805-0098
- Resource Relation:
- Conference: Spring national meeting of the American Chemical Society (ACS), New Orleans, LA (United States), 24-28 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of 211th ACS national meeting; PB: 2284 p.
- Country of Publication:
- United States
- Language:
- English
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