CIHIDECAR   12529
CENTRO DE INVESTIGACIONES EN HIDRATOS DE CARBONO
Unidad Ejecutora - UE
artículos
Título:
Stereoregular [m,n]-polyurethanes derived from D-mannitol
Autor/es:
FIDALGO, DANIELA M.; KOLENDER, ADRIANA A.; VARELA, OSCAR
Revista:
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Editorial:
JOHN WILEY & SONS INC
Referencias:
Lugar: New York; Año: 2013 vol. 51 p. 463 - 470
ISSN:
0887-624X
Resumen:
Novel linear carbohydrate-derived [m,n]-polyurethanes
are successfully prepared using D-mannitol as renewable
and low cost starting material. The key comonomer,
1,6-di-O-phenylcarbonyl-2,3,4,5-tetra-O-methyl-D-mannitol is polymerized
with a diamine synthesized from D-mannitol or with
alkylenediamines. These polymerization reactions afford,
respectively, a [6,6]-polyurethane entirely based on a carbohydrate
derivative or [m,n]-polyurethanes constituted by a poly-
O-methyl substituted unit alternating with a polymethylene
chain. All these polymers are stereoregular, as result of the C2
axis of symmetry of mannitol. The optically active polyurethanes
are characterized by standard methods (FTIR, RMN,
GPC, TGA, and DSC). Thus, GPC analysis reveals weight-average
molecular weights between 18,000 and 25,000 Da. Thermal
studies (DSC) indicate that the polymers obtained are amorphous
materials with Tg values dependent on the structure
and chain length of the diamine constituent.