Navegando por Autor "Moreira, Lucas Emiliano de Souza"
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Item Biodegradation of Moringa oleifera’s polymer blends.(2019) Quintão, Cristiane Medina Finzi; Novack, Kátia Monteiro; Silva, Ana Cláudia Bernardes; Silva, Thais D.; Moreira, Lucas Emiliano de Souza; Braga, Luiza Eduarda MoraesVegetable oils are used as a base for the synthesis of polymers and monomers with structures similar to that of petroleum, as plasticizers for conventional polymers and biodegrading additives. The Moringa oleifera oil was extracted from seeds and polymerized after being submitted to 16 h of microwave irradiation without catalysers. This polymer was characterized and the efficiency of the oil polymerization was verified by the reduction of double bonds and the increase of molecular weight up to 50,000 g mol−1. Films produced by a mixture of low-density polyethylene (LDPE) with poly(butylene adipate-co-terephthalate)/poly(lactic acid) (PBAT/PLA) present low tensile resistance and low biodegradation behaviour. In order to improve those properties, the Moringa polymer (PMO) was mixed with LDPE and PBAT/PLA in specific mass concentrations. The films produced with this mixture were characterized and submitted to biodegradation analysis. The PMO behaves as a compatibilizer by improving thermal properties, reducing the crystalline phase and improving the biodegradation behaviour. The biodegradation improved up to five times in comparison to conventional polymers and it restores the mechanical properties.Item Influence of Moringa oleifera derivates in blends of PBAT/PLA with LDPE.(2018) Quintão, Cristiane Medina Finzi; Novack, Kátia Monteiro; Silva, Ana Cláudia Bernardes; Silva, Thais Dhayane; Moreira, Lucas Emiliano de Souza; Braga, Luiza Eduarda MoraesThere are few studies about Moringa oleifera derivates in polymer developments where vegetable oil was used as a plasticizer and a biodegrading agent. The polymerization of moringa oil (MO) was carried out assisted by microwaves without catalysts presence. There aren’t studies about the polymerization of MO using microwaves technology. Moringa’s oil and its polymer (PMO) were used as a biodegrading agent for mixtures of low density polyethylene (LDPE) with poly(butylene adipate-co-terephthalate)/poly(lactic acid) (PBAT/PLA). The mixtures producted films that were characterized and submitted to biodegradation analysis in order to discuss the influence of moringa components. Results showed that both moringa components improved thermal properties and reduced the crystalline phase of the mixture. The addition of PMO had improved the biodegradation capacity up to five times while MO had improved it up to three times. The results showed the greatest influence of moringa components on biodegradation of mixtures with cited polymers.Item Influência da adição de biomassa obtida após a extração do óleo da semente de Moringa oleífera nas propriedades térmicas, morfológicas e mecânicas em compósitos de matrizes termoplásticas.(2018) Moreira, Lucas Emiliano de Souza; Novack, Kátia Monteiro; Novack, Kátia Monteiro; Melo, Tânia Márcia Sacramento; Freire, EstêvãoJunto ao consumo exacerbado de produtos cada vez mais industrializados, cresce também a preocupação com o descarte pós uso de embalagens e peças já sem utilidade. Neste contexto, a utilização de materiais compósitos biodegradáveis, ganha notoriedade na pesquisa científica mundial. Este trabalho teve o objetivo de analisar a influência da adição da biomassa obtida após a extração do óleo das sementes de Moringa oleifera em compósitos de matrizes termoplásticas. Através da obtenção de corpos de prova de termoplásticos puros e de compósitos com diferentes composições, foi avaliado o comportamento térmico, mecânico e morfológico das amostras. Foi realizado ensaio de tração nos compósitos, bem como a caracterização química e físico-química da biomassa de modo a verificar se o teor de celulose após a extração do óleo é conservado, tendo em vista que o teor de celulose influencia diretamente na resistência da fibra. As amostras foram caracterizadas por Espectroscopia na região do Infravermelho com Transformada de Fourier (FTIR), Difratometria de Raios X (XRD), Microscopia Eletrônica de Varredura (MEV), Análise Termogravimétrica (TGA) e Calorimetria Diferencial de Varredura (DSC). A determinação das propriedades térmicas, morfológicas e mecânicas ao final desse trabalho é de extrema validade, pois a substituição de resinas termoplásticas por materiais compósitos tem grande importância na redução de resíduos não biodegradáveis, uma vez que estes geram impactos irreversíveis ao ecossistema do planeta.Item Moringa oleifera oil and polymer in mixtures with commercial polymers – comparing study.(2018) Quintão, Cristiane Medina Finzi; Silva, Ana Cláudia Bernardes; Melo, Tânia Márcia Sacramento; Moreira, Lucas Emiliano de Souza; Silva, Thais D.; Novack, Kátia MonteiroComposites may be obtained by the mixture of two materials, which one of them is a polymer, with the objective of produced a material with a specific characteristics. Vegetable oils (VO) are mixture with conventional polymer to improve biodegradation capacity without loss mechanical properties. VOs polymers are an alternative to conventional polymers on composites. Previous studies showed that the mixture of Moringa oleifera polymer (PMO) with polyethylene (PE) and biodegradable polymer (PB) producing a composite with high biodegrading capacity maintaining mechanical properties. M. oleifera oil (MO) was obtained from extraction of seeds in and presents higher concentration of instauration fatty acids as oleic acid (71%) which has high stability and favors the polymerization process. The polymerization assisted by microwaves technology can be used in organic synthesis as a function of the process efficiency and the increase in the selective heating rate. The polymerization of MO assisted by microwaves produced a polymer (PMO) with molecular weight higher than 50,000 g.mol-1.This manuscript shows comparing results for biodegradation behavior and mechanical properties of mixtures by MO or PMO with low density polyethylene and the commercial biopolymer composed by poly (butylene adipate-co-terephthalate) (PBAT) with poly(lactic acid) (PLA). It was verified that MO presented a plasticizer behavior on mixture LDPE/PBAT/PLA (PM) and PMO presented a compatibilizer behavior with PM. It was also verified that mixtures with PMO presented better biodegradation and mechanical properties than those composed by MO.