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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Licuri Resíduo de origem vegetal Compósito polimérico Ecodesign Sustentabilidade CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
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Licuri Resíduo de origem vegetal Compósito polimérico Ecodesign Sustentabilidade CNPQ::ENGENHARIAS::ENGENHARIA MECANICA Mota, Rui Carlos de Sousa Aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico |
| description |
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. |
| author2 |
Mendes, José Ubiragi de Lima |
| author_facet |
Mendes, José Ubiragi de Lima Mota, Rui Carlos de Sousa |
| format |
doctoralThesis |
| author |
Mota, Rui Carlos de Sousa |
| author_sort |
Mota, Rui Carlos de Sousa |
| title |
Aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico |
| title_short |
Aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico |
| title_full |
Aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico |
| title_fullStr |
Aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico |
| title_full_unstemmed |
Aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico |
| title_sort |
aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico |
| publisher |
Brasil |
| publishDate |
2018 |
| url |
https://repositorio.ufrn.br/jspui/handle/123456789/25446 |
| work_keys_str_mv |
AT motaruicarlosdesousa aproveitamentodoexocarpodolicuriparticuladoparaproducaodeumcompositoutilizandocomomatrizumpoliesterortoftalico |
| _version_ |
1773967364030726144 |
| spelling |
ri-123456789-254462019-01-29T22:10:36Z Aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico Mota, Rui Carlos de Sousa Mendes, José Ubiragi de Lima Farias, Aline Cristina Mendes de Ribeiro, Fernanda Alves Silva, Iris Oliveira da Santos, Natanaeyfle Randemberg Gomes dos Paranhos, Raimundo Jorge Santos Licuri Resíduo de origem vegetal Compósito polimérico Ecodesign Sustentabilidade CNPQ::ENGENHARIAS::ENGENHARIA MECANICA 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. Visando a melhoria e otimização dos processos produtivos, pesquisadores dos mais diversos segmentos buscam apresentar soluções que reduzam custos operacionais e a utilização de matéria-prima empregada na fabricação de bens em geral. O uso de resíduo, de origem vegetal e industrial, atende ao apelo da sustentabilidade e agrega renda aos agricultores familiares e de baixa renda. Este trabalho estuda o aproveitamento do exocarpo da fruta do licurizeiro (Syagro Coronata), palmeira nativa do semiárido baiano e chamada também de nicuri, licuri, Ouricuri etc. e tem como objetivo contribuir para a ampliação da cadeia produtiva, agregando renda ao pequeno produtor e ao agricultor familiar. Para tanto, buscou-se caracterizar e analisar as propriedades mecânicas e térmicas do referido resíduo, que após a cominuição pelo processo de impacto (pilão manual) e moagem em um moinho de facas com telas de 1,0 mm e de passar pelo processo de peneiramento para separar as partículas com tamanhos entre 0,0085 e 0,0074 mm e foi caracterizado por MEV, DRX; TG e densidade volumétrica para melhor conhecer suas propriedades. Este particulado foi utilizado como carga em um compósito polimérico tendo como matriz a resina poliéster ortoftalica pré acelerada em quatro proporções em massa, 10; 20; 30 e 40 % que foram comparadas com a resina pura e que depois foi caracterizados MEV, por DRX, TG, Condutividade térmica, densidade volumétrica, impacto, absorção de água, tração e flexão em três pontos, para tanto foram fabricadas placas com as dimensão de 400 x 300 x 8 mm e cortado os corpos de provas de acordo com as normas vigentes, a mistura foi homogeneizada com a utilização de uma batedeira doméstica por dez minutos a uma rotação de 720 rpm e depois despejada na forma de granito e deixado curar por oito horas e uma pós cura de mais oito horas, depois foi cortado os corpos de prova nas dimensões normatizadas e lixadas e polidas para que não houvesse a menor interferência possível nos resultados. Ficou demonstrado que a formulação com adição de 20% de resíduo apresentou no geral uma melhor performance para utilização estrutural em aplicações que não exijam solicitações mecânicas, assim como um melhor acabamento para utilização em ecodesign e peças acadêmicas. 2018-06-18T21:08:39Z 2018-06-18T21:08:39Z 2017-09-11 doctoralThesis MOTA, Rui Carlos de Sousa. Aproveitamento do exocarpo do licuri particulado para produção de um compósito utilizando como matriz um poliéster ortoftálico. 2017. 142f. Tese (Doutorado em Engenharia Mecânica) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/25446 por Acesso Aberto application/pdf Brasil UFRN PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA MECÂNICA |