INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Castor oil-based Polyurethanes containing Cellulose Nanocrystals
Autor/es:
V. M. WIK; M. I. ARANGUEN; M. A. MOSIEWICKI
Revista:
POLYMER ENGINEERING AND SCIENCE
Editorial:
JOHN WILEY & SONS INC
Referencias:
Año: 2010
ISSN:
0032-3888
Resumen:
Partially foamed and nanocellulose-reinforced polyurethanes
(PU) based on castor oil (CO) were prepared
and their different properties were measured and
related to their structures. A castor oil-based polyol
(COPO) was obtained by alcoholysis of CO with triethanolamine.
The COPO was used in the preparation of
partially foamed and solid PU. Cellulose nanofibrils
(NC) in the range of the rheological percolation content
were incorporated to the materials and the final mechanical
properties of these nanocomposites were analyzed.
The incorporated NC considerably affected the
rheology of the suspensions, which presented solidlike
behavior under frequency sweep tests with the
addition of only 0.5 wt% of NC. By increasing the NC
concentration the dispersion becomes increasingly difficult.
The properties of the solid PU were also affected
by the incorporation of NC and a significant increase
of the tensile modulus was observed for the 0.5 wt%
NC composite, compared to the unfilled solid PU. This
behavior was associated to the incorporation of the
rigid particle reinforcement and the interfacial bonding.
As expected, the partially foamed PU showed lower
modulus than the corresponding solid PU.