Efeito da adição de grafite expandido por microondas nas propriedades térmicas, elétricas e mecânicas de nanocompósitos de matriz epóxi
Epoxy based nanocomposites with 1 wt % and 3 wt % of nanographite were processed by high shear mixing. The nanographite was obtained by chemical (acid intercalation), thermal (microwave expansion) and mechanical (ultrasonic exfoliation) treatments. The mechanical, electrical and therma...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/12831 |
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| Resumo: | Epoxy based nanocomposites with 1 wt % and 3 wt % of nanographite were
processed by high shear mixing. The nanographite was obtained by chemical (acid
intercalation), thermal (microwave expansion) and mechanical (ultrasonic exfoliation)
treatments. The mechanical, electrical and thermal behavior of the nanocomposites
was determined and evaluated as a function of the percentage of reinforcement.
According to the experimental results, the electrical conductivity of epoxy was not
altered by the addition of nanographite in the contents evaluated. However, based on
the mechanical tests, nanocomposites with addition of 1 wt.% and 3 wt.% of
nanographite showed increase in tensile strength of 16,62 % and 3,20 %,
respectively, compared to the neat polymer. The smaller increase in mechanical
strength of the nanocomposite with 3 wt.% of nanographite was related to the
formation of agglomerates. The addition of 1 wt.% and 3 wt.% of nanographite also
resulted in a decrease of 6,25 % and 17,60 %, respectively, in the relative density of
the material. Thus, the specific strength of the nanocomposites was approximately
33,33 % greater when compared to the neat polymer. The addition of 1 wt.% and 3
wt.% of nanographite in the material increased the mean values of thermal
conductivity in 28,33 % and 132,62 %, respectively, combined with a reduction of
26,11 % and 49,80 % in volumetric thermal capacity, respectively. In summary, it has
been determined that an addition of nanographite of the order of 1 wt.% and 3 wt.%
produced notable elevations in specific strength and thermal conductivity of epoxy |
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