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artículos
Título:
Influence of Fiber Volume Fraction and Aspect Ratio in Resol/SisalComposites
Autor/es:
C. N. ZÁRATE; M.I. ARANGUREN; M.M. REBOREDO
Revista:
JOURNAL OF APPLIED POLYMER SCIENCE
Editorial:
Wiley
Referencias:
Lugar: New York; Año: 2003 vol. 89 p. 2714 - 2722
ISSN:
0021-8995
Resumen:
Vegetable fibers are being used as reinforcements
in polymeric matrices with a wide variety of applications.
Among these fibers, sisal is of particular interest due
to the high impact strength and moderate tensile and fiexural
properties of its derivated composites. Because of its
low cost and affinity, a phenolformaldehyde resin, resol,
has been selected as the matrix to obtain resolsisal composites.
The infiuence of fiber length and volume fraction on
fiexural properties has been studied. An optimum for the
fiber length as well as for the fiber volume fraction was
found. The improvement of the properties occurred up to a
length of about 23 mm. The use of longer fibers lead to
reduced properties because they tended to curl and bend
during processing. Besides, actual composite densities were
lower than theoretical ones mainly due to the presence of
voids. This undesirable porosity produced a reduction in
fiexural properties at high fiber contents.
© 2003 Wiley Periodicals,
Inc. J Appl Polym Sci 89: 27142722, 2003
Key words: composites; thermosets; mechanical properties;
fibers