RENE RAMOS DE OLIVEIRA

RENE RAMOS DE OLIVEIRA

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Production and characterization of PBAT reinforced with clay and graphene oxide nanosheets
2020 - COSTA, ROBSON S.; ARAUJO, DANIELLE G.; ANDRADE, MARCIO S. de; OLIVEIRA, RENE R.; RANGARI, VIJAYA; MOURA, ESPERIDIANA A.B.; DIAS, FRANCISCO V.
The poly (butylene adipate-co-terephthalate) (PBAT), a biodegradable polymer, is among the most promising materials to be considered as environmentally friendly high performance biodegradable plastics. However, the mechanical properties of PBAT are not the best for several applications. According to the literature, the properties of the biodegradable polymer can be improved by addition of a small amount of nanofillers, such as clay, silica, and graphene. The objective of this study is to compare the effect of the addition of Cloisite clay and graphene oxide (GO) on the properties of flexible films based on PBAT matrix. The composite films based on PBAT with addition of Cloisite (2.0 wt%) and PBAT composite films with addition of Cloisite and GO (0.1–0.2 wt%) were prepared by extrusion, using a twin-screw extruder and a flat die single extruder. The effects of the addition of Cloisite clay and graphene oxide on mechanical and thermal properties of films were evaluated by mechanical and water absorption tests, FE-SEM, XRD, and Raman analysis.
Efecto morfológico y térmico de filmes flexibles de etilen vinil alcohol reforzados con óxido de grafeno
2015 - YATACO-LAZARO, LOURDES M.; GONZALEZ-RUIZ, JESUS; VIRGINIO, SUELI; OLIVEIRA, RENE R.; MAIA, WILSON S.; VALENZUELA-DIAZ, FRANCISCO; MOURA, ESPERIDIANA
Se estudió los efectos morfológicos y térmicos de los filmes de EVOH reforzados con 0.1 y 0.5 wt. % de GO. El EVOH ha sido ampliamente usado en embalajes para alimentos porque preserva la calidad de los productos debido a su excelente desempeño de barrera de gas y su buena transparencia. El GO fue preparado vía oxidación química del grafito y fue exfoliado en nanoláminas usando el método sonoquímico. Los filmes fueron preparados por extrusión en estado fundido y extrusión por soplado, luego fueron caracterizados por análisis de XRD, TG y SEM, la correlación entre sus propiedades fue discutida.
Comparative study of the use of rice husk ashes and graphite as fillers in polypropylene matrix composites
2019 - MONTEIRO, ALEX S.; BARREIRA, DAILI A.S.; BARTOLOMEI, SUELLEN S.; OLIVEIRA, RENE R.; MOURA, ESPERIDIANA A.B. de
In recent years, carbonaceous materials have been widely studied for polymer composite applications due to its capability to improve the engineering properties of the polymeric matrix. Among various carbonaceous fillers, carbon nanotube, graphene, and graphite promise to be a suitable reinforcement of polymers. Rice husk ash (RHA), a large residue rich in carbon and silica produced by the burning of rice husk offers also an immense potential as a carbonaceous filler for polymer composites on account of its lowcost, lowdensity, high strength and elastic modulus, no health risks, and renewability. This work aims at studying the effects of RHA and graphite as fillers in polypropylene (PP) matrix composites. The composites PP/RHA and PP/graphite were produced by melting extrusion process. The materials obtained were subjected to mechanical tests, XRD, TG, and FEG-SEM analyses. Comparison studies between neat PP properties and its composites were carried out.
Comparative study of the effects of cellulose nanowhiskers and microcrystalline cellulose addition as reinforcement in flexible films based on biopolymer blends
2016 - PAIVA, DOUGLAS A.; OLIVEIRA, RENE R.; MAIA, WILSON da S.; AUAD, MARIA L.; RANGARI, VIJAYA K.; MOURA, ESPERIDIANA A.B.
The objective of this study is to compare the effects of the addition of cellulose nanowhiskers and microcrystalline cellulose on properties of flexible films based on biodegradablepolymer blends. Composite films containing 1 wt. % of microcrystalline cellulose and 1-2 wt.% of cellulose nanowhiskers were prepared by melt extrusion, using a twin screw extruder machine and blown extrusion process. The effects of the addition of cellulose nanowhiskers and microcrystalline cellulose on mechanical and thermal properties of biocomposite films were investigated by tensile tests, XRD, TG, DSC and FE-SEM analysis and the correlation between properties was discussed.
Processamento e caracterização de polietileno reforçado com resíduos de fibras vegetais e bentonita brasileira
2015 - GOMES, MICHELLE; SILVA, VALQUIRIA A.; OLIVEIRA, RENE R.; GODOY, RENATO B.; VALENZUELA-DIAZ, FRANCISCO R.; MOURA, ESPERIDIANA A.B.
Investigation on mechanical and thermal behaviours of copolyester/pla blend reinforced with TiOsub(2) nanoparticle
2015 - LIMA, ROBERTA A.; OLIVEIRA, RENE R.; RANGARI, VIJAYA K.; JEELANI, SHAIK; MOURA, ESPERIDIANA A.B.
Biodegradable starch/copolyesters film reinforced with silica nanoparticles
2015 - LIMA, ROBERTA A.; OLIVEIRA, RENE R.; WATAYA, CELIO H.; MOURA, ESPERIDIANA A.B.
Mechanical morphological and thermal properties of açai fibers reinforced biodegradable polymer composites
2015 - WATAYA, CELIO H.; LIMA, ROBERTA A.; OLIVEIRA, RENE R.; MOURA, ESPERIDIANA A.B.
Investigation on mechanical and morphological behaviours of copolyesters/starch blend reinforced with rice husk ash
2014 - OLIVERIA, ELIANE H. de; SILVA, VALQUIRIA A.; OLIVEIRA, RENE R.; TERAN, ALEJANDRA S.; CASTILHO, ANIBAL V.A.; VALENZUELA-DIAZ, FRANCISCO R.; MOURA, ESPERIDIANA A.B.; HARADA, JULIO
Biodegradable aliphatic aromatic copolyester/corn starch blend composite reinforced with cofee parchment hush
2013 - SILVA, VALQUIRIA A.; TEIXEIRA, JACIELE G.; GOMES, MICHELLE G.; ORTIZ, ANGEL V.; OLIVEIRA, RENE R.; SCAPIN, MARCOS A.; COLOMBO, MARIA A.; MOURA, ESPERIDIANA A.B.