INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Effect of Natural Rubber on Wood Reinforced Tannin Composites
Autor/es:
M. A. MOSIEWICKI; M. I. ARANGUREN; A.A.S.CURVELO; J.BORRAJO
Revista:
JOURNAL OF APPLIED POLYMER SCIENCE
Editorial:
WILEY
Referencias:
Año: 2007 vol. 105 p. 1825 - 1832
ISSN:
0021-8995
Resumen:
ABSTRACT: Natural rubber latex was added to composite
materials formulated from a quebracho tannin adhesive
crosslinked with hexamethylenetetramine and wood flour
as a reinforcing filler. The final microstructure of the thermoset
modified by the addition of different concentrations
of latex was observed by scanning electron microscopy.
The flexural and impact behavior of the modified materials
was analyzed and related to the final microstructure of the
composites. The effect of exposing the materials to humid
environments was also evaluated. The measurements indicated
that the addition of latex did not significantly reduce
water absorption. However, it facilitated the preparation
process of samples with low filler contents because of the
increased viscosity of the mixture, which inhibited particle
settling. On the other hand, the flexural properties increased
with the addition of latex-containing proteins
through a reaction similar to tanning in leathers. The
impact properties presented a similar trend, with the largest
change occurring between 0 and 5% natural rubber in
the matrix formulation.
Key words: composites; diffusion; elastomers; fillers; mechanical
properties