Abstract
In this study, composites based on carbon fiber and a modified epoxy
resin were obtained. The modification on the polymeric matrix was
performed by adding functionalized multi-walled carbon nanotubes coated
with zinc sulphide particles (MWCNT-ZnS), synthetized by hydrothermal
synthesis assisted by microwave. For comparison, samples containing only
functionalized multi-walled carbon nanotubes (MWCNTf) were also tested.
The influences on chemical, structural, mechanical, and thermal
properties of the composites were evaluated. For the filler
characterization, X-ray diffraction, transmission electronic microscopy,
and Raman spectroscopy were used. The modified polymeric matrix was
evaluated by thermogravimetric analysis and the mechanical evaluation of
the carbon fiber laminated composites was made by tensile and impact
tests. The results showed that the tensile strength and Young's modulus
of the composites increased with the presence of carbon nanofillers. The
absorbed energy on impact had higher values for the composites modified
with MWCNTf. It was verified that the samples containing MWCNTf-ZnS were
more thermally stable, mainly due to the ZnS particles coating the
MWCNTf surface.
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