Made available in DSpace on 2014-12-17T14:58:07Z (GMT). No. of bitstreams: 1
SistanleyJLB_DISSERT.pdf: 3362424 bytes, checksum: 30d67bc0b13dba47c7002133ab1bb63d (MD5)
Previous issue date: 2011-06-20 / This research presents an approach to the addition of curau? fibers and licuri fibers in
a polypropylene resin matrix, such as an alternative proposal to reinforce the polymeric
composites. Fiber content of 0 %, 5 %, 10 %, and 20% were analyzed for verification of their
mechanical properties comparing them, inclusive with the properties of polypropylene. The
grainulated biocomposites had been prepared in an extrusora. The test bodies had been
molded by injection and submitted to the mechanical essays uniaxial traction, flexion on three
points, impact, in addition to thermal tests (HDT). These biocomposites had been also
subjected the essay physicist-chemistry index of fluidity (IF). It was observed that the
biocomposites of PP with 20% curau?, obtained bigger increase in the modulus of elasticity
and a bigger reduction in the resistance to the impact. In the mechanical behavior, for all the
biocomposites, these were increases in values of the limit of drainage and tension of rupture,
when tested by uniaxial traction, as they added the fibers. Another important point was the
increase of the resistance the flexion. It was also noted that the addition of fibers reduced the
thermal degradation of the mixture natural fibers / polypropylene. / Esta pesquisa apresenta uma abordagem da adi??o de fibras de licuri e curau? em uma
matriz de resina de polipropileno, essa como uma proposta alternativa de refor?o aos
comp?sitos polim?ricos. Teores de fibras de 0 %, 5 %, 10 %, e 20 % foram analisados para
verifica??o de suas propriedades mec?nicas comparando-as, inclusive com as propriedades do
polipropileno. Os biocomp?sitos granulados foram preparados em uma extrusora. Os corpos
de prova foram moldados por inje??o e submetidos aos ensaios mec?nicos de tra??o uniaxial,
flex?o em tr?s pontos, impacto, al?m de ensaios t?rmicos (HDT). Estes biocomp?sitos
tamb?m foram submetidos a ensaio f?sico-qu?mico de ?ndice de fluidez (IF). Observou-se que
os biocomp?sitos de PP com 20% curau? obteve maior aumento no m?dulo de elasticidade, e
uma maior diminui??o na resist?ncia ao impacto. No comportamento mec?nico, para todos os
biocomp?sitos, houve acr?scimos nos valores do limite de escoamento e tens?o de ruptura
quando ensaiados por tra??o uniaxial, ? medida que se adicionavam as fibras. Outro ponto
importante foi o aumento da resist?ncia ? flex?o. Verificou-se tamb?m que a adi??o de fibras
reduziu a degrada??o t?rmica da mistura fibras naturais / polipropileno.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15649 |
| Date | 20 June 2011 |
| Creators | Bispo, Sistanley Jones Lima |
| Contributors | CPF:02306444498, http://lattes.cnpq.br/1042806990155996, Aquino, Eve Maria Freire de, CPF:16080564491, http://lattes.cnpq.br/1196595599227394, Silva, Luiz Claudio Ferreira da, CPF:79098630472, http://lattes.cnpq.br/3812459994118013, Santos, Marco Antonio dos, CPF:18471200082, Freire J?nior, Raimundo Carlos Silv?rio |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia Mec?nica, UFRN, BR, Tecnologia de Materiais; Projetos Mec?nicos; Termoci?ncias |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
Page generated in 0.0023 seconds