INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
POLYURETHANES FROM TUNG OIL: POLYMER CHARACTERIZATION AND COMPOSITES
Autor/es:
M. A. MOSIEWICKI; U. CASADO; N. E. MARCOVICH; M. I. ARANGUREN
Revista:
POLYMER ENGINEERING AND SCIENCE
Editorial:
JOHN WILEY & SONS INC,
Referencias:
Lugar: HOBOKEN, USA; Año: 2008 p. 685 - 692
ISSN:
0032-3888
Resumen:
A natural polyol was obtained from tung oil (TO) to be
further used in the formulation of rigid polyurethane
polymers. The synthesis of the polyol was carried out
in two steps: first hydroxylation of the double bonds in
the fatty acid chains of the unsaturated oil and then,
alcoholysis of the hydroxylated oil with triethanolamine.
The chemical analysis (titration, FTIR, 1H NMR)
of the unmodified TO, the hydroxylated tung oil, and
the alcoholized hydroxylated tung oil-based polyol indicates
that the hydroxyl content increased significantly
after the hydroxylation and alcoholysis reactions. The
modified TO was subsequently used as the polyol
component in the formulation of reinforced rigid polyurethanes.
Wood flour (WF) and microcrystalline cellulose
were the reinforcements chosen to be incorporated
in these materials. Physical, thermal, and mechanical
properties of the neat and reinforced
polyurethanes were measured and analyzed. An excellent
dispersion of the WF in the matrix, confirmed by
scanning electron microscopy, was observed in the
polyurethane reinforced with WF. This system also presented
the highest modulus and strength.