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Previous issue date: 2013-08-23 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work studied the immiscible blend of elastomeric poly(methyl methacrylate)
(PMMA) with poly(ethylene terephthalate) (PET) bottle grade with and without the
use of compatibilizer agent, poly(methyl methacrylate-co-glycidyl methacrylate -
co-ethyl acrylate) (MGE). The characterizations of torque rheometry, melt flow
index measurement (MFI), measuring the density and the degree of cristallinity
by pycnometry, tensile testing, method of work essential fracture (EWF),
scanning electron microscopy (SEM) and transmission electron microscopy
(TEM) were performed in pure polymer and blends PMMA/PET. The rheological
results showed evidence of signs of chemical reaction between the epoxy group
MGE with the end groups of the PET chains and also to the elastomeric phase of
PMMA. The increase in the concentration of PET reduced torque and adding
MGE increased the torque of the blend of PMMA/PET. The results of the MFI also
show that elastomeric PMMA showed lower flow and thus higher viscosity than
PET. In the results of picnometry observed that increasing the percentage of PET
resulted in an increase in density and degree crystallinity of the blends
PMMA/PET. The tensile test showed that increasing the percentage of PET
resulted in an increase in ultimate strength and elastic modulus and decrease in
elongation at break. However, in the phase inversion, where the blend showed
evidence of a co-continuous morphology and also, with 30% PET dispersed
phase and compatibilized with 5% MGE, there were significant results elongation
at break compared to elastomeric PMMA. The applicability of the method of
essential work of fracture was shown to be possible for most formulations. And it
was observed that with increasing elastomeric PMMA in the formulations of the
blends there was an improvement in specific amounts of essential work of
fracture (We) and a decrease in the values of specific non-essential work of
fracture (βWp) / Neste trabalho ? estudada a blenda imisc?vel poli(metacrilato de metila) (PMMA)
elastom?rico com poli(tereftalato de etileno) (PET) grau garrafa com e sem o uso
do agente compatibilizante, poli(metacrilato de metila-co-metacrilato de glicidilaco-
acrilato de etila) (MGE). As caracteriza??es de reometria de torque, medida
de ?ndice de fluidez (MFI), determina??o da densidade e do grau de cristalinidade
por picnometria, ensaio de tra??o uniaxial, m?todo do trabalho essencial fratura
(EWF), microscopia eletr?nica de varredura (MEV) e microscopia eletr?nica de
transmiss?o (MET), foram realizadas nos pol?meros puros e nas blendas
PMMA/PET. Os resultados reol?gicos apresentaram ind?cios de rea??o qu?mica
entre o grupo ep?xi do MGE com os grupos finais de cadeias do PET e, tamb?m,
com a fase elastom?rica do PMMA. O aumento na concentra??o de PET reduziu
o torque e a adi??o do MGE aumentou o torque da blenda PMMA/PET. Os
resultados de MFI mostraram tamb?m que, o PMMA elastom?rico apresentou
menor fluidez e, consequentemente, maior viscosidade que o PET. Nos
resultados de picnometria observou-se que, o aumento da porcentagem de PET
proporcionou um aumento na densidade e no grau de cristalinidade das blendas
PMMA/PET. Os ensaios de tra??o mostraram que, o aumento da porcentagem
de PET proporcionou um aumento na resist?ncia m?xima e no m?dulo de
elasticidade e uma diminui??o no alongamento na ruptura. Entretanto, na
invers?o de fase, onde a blenda apresentou ind?cios de uma morfologia cocont?nua
e tamb?m, com 30% de fase dispersa PET e compatibilizada com 5%
de MGE, verificaram-se resultados expressivos de alongamento na ruptura em
rela??o ao PMMA elastom?rico. A aplicabilidade do m?todo do trabalho
essencial de fratura mostrou-se poss?vel para a maioria das formula??es.
Observou-se ainda que, com o aumento do PMMA elastom?rico nas formula??es
das blendas, ocorreu uma melhoria nos valores do trabalho essencial espec?fico
de fratura (We) e uma redu??o nos valores do trabalho n?o essencial espec?fico
de fratura (βWp)
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12814 |
| Date | 23 August 2013 |
| Creators | Reinaldo, Jucikl?cia da Silva |
| Contributors | CPF:40405036191, http://lattes.cnpq.br/7249500407405478, Nascimento, Maria Carolina Burgos Costa do, CPF:03449466496, http://lattes.cnpq.br/4409025248163428, Silva, Wanderson Santana da, CPF:94086591634, Batista, Wilton Walter, CPF:49520229434, http://lattes.cnpq.br/6216349050353010, Ito, Edson Noriyuki |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| 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 |
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