Aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico
Researchers from different scientific fields are focused on improving and optimizing production processes by pursuing solutions to help reducing operational costs and the amount of raw materials used to manufacture general goods. The use of plant and industrial wastes complies with sustainability...
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| Formato: | doctoralThesis |
| Idioma: | por |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25446 |
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| Resumo: | Researchers from different scientific fields are focused on improving and optimizing
production processes by pursuing solutions to help reducing operational costs and
the amount of raw materials used to manufacture general goods. The use of plant
and industrial wastes complies with sustainability goals and helps providing additional
income to family farmers. The palm tree species Syagro Coronata, which is also
known as nicuri, licuri, Ouricuri, among others, is native to Bahia State semi-arid
region. The aim of the current research is to study the fruit exocarp of the
aforementioned species in order to help expanding the productive chain, as well as to
allow creating an additional source of income to small producers and family farmers.
Accordingly, the present study featured and analyzed the mechanical and thermal
properties of the aforementioned waste. The fruit exocarp was subjected to
comminution through impact (manual pestle) and milling (in a knife mill with 1.0 mm
mesh) processes. Next, it was sieved to separate particles between 0.0085 and
0.0074 mm; it was also characterized through SEM, XRD, TG and volumetric density
to allow better understanding its properties. The particulate was used as filler in a
polymeric composite, whose matrix comprised an orthophthalic polyester resin preaccelerated
in four mass proportions (10, 20, 30 and 40%). Such proportions were
compared to the pure resin and, then, characterized through SEM, XRD, TG, thermal
conductivity, volumetric density, impact, water absorption, tensile and three-point
bending tests. In order to do so, 400 x 300 x 8 mm plates were manufactured, and
specimens were cut according to current standards. The mixture was homogenized
in a domestic shaker for ten minutes at 720 rpm. Then, it was poured into a granite
mold and left to cure for eight hours, which was followed by the post-cure for
additional eight hours. The specimens were cut in standardized dimensions at the
end of the post-cure period; they were also sanded and polished to avoid the
slightest interference in the results, which were quite satisfactory and met the
research expectations. The uniaxial tensile strength test showed reduction due to
waste addition; such result was not recorded in the total elongation test. The results
of the three-point bending test were lower than the ones recorded for the pure resin
in all formulations. According to the thermogravimetric analysis, there was water loss
at 150°C and its exothermic peak varied from 400°C to 409°C; such finding allowed
attributing good thermal resistance to the material. The potential of hydrogen (pH)
lied on the neutral range and presented good resistance to waterlogging. Overall, the
performance of each formulation enabled using them in structural applications that do
not require large. In addition, these formulations can be used in decorative pieces
and adopted in practical classes focused on mechanical manufacturing processes. |
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