Vegetal Polymer
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Study of the Moisture Absorption in Polymer Composites Reinforced with Vegetal Fiber Using Langmuir’s Model
This work aims to numerically study the moisture absorption in polymer composites reinforced with vegetal fiber, using the diffusive model of Langmuir, which considers the existence of water molecules inside the material free to diffuse and adsorb at the capillaries walls, in the solid. A three-dimensional and transient mathematical modelling to describe the
Mat. Res.. Publicado em: 11/11/2019
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2. Presence of iron in polymers extruded with corrosive contaminants or abrasive fillers
Abstract Off-site measurements of the dimensions of extruder screws are used to monitor their wear. This wear causes the presence of metals in the processed polymer. We detected the presence of iron in polymers processed with corrosive contaminants or abrasive fillers. To this end we processed poly(ethylene terephthalate), PET, pure or contaminated with poly
Polímeros. Publicado em: 10/06/2019
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3. Curaua fiber reinforced high-density polyethylene composites: effect of impact modifier and fiber loading
Abstract Short fibers are used in thermoplastic composites to increase their tensile and flexural resistance; however, it often decreases impact resistance. Composites with short vegetal fibers are not an exception to this behavior. The purpose of this work is to produce a vegetal fiber reinforced composite with improved tensile and impact resistance in rela
Polímeros. Publicado em: 07/06/2016
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4. Estudo histológico dos tecidos conjuntivo e osteóide em enxertos ósseos com polímero de mamona : estudo experimental em ratos / Histological study of connective and osteoid tissue in bone grafts with castor oil polymer : experimental study in rats
The reconstruction of great bone loss defects represents a challenge for reconstructive surgery. To reconstruct these defects it is necessary to create conditions to stimulate new bone formation, in order to block the connective healing tissue growth towards the bony defect, which blocks the osteogenesis. The autogenous grafts are inconvenient, because they
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/12/2011
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5. Estudos de fenômenos de osteogênese em implantes de polímero vegetal / A study of osteogenesis phenomena in plaint polymer implants
O objetivo deste estudo foi analisar a modulação da expressão de metaloproteinases da matriz-2 e -9, no tecido ósseo neoformado na interface do implante derivado do polímero da mamona (Ricinus communis) com o canal medular da tíbia de coelhos, por meio de análise histológica por microscopia óptica, tomografia computadorizada e imunoistoquímica. For
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/10/2011
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6. Nova equação cúbica de estado para a predição do equilíbrio líquido-vapor de misturas complexas envolvendo polímeros e óleos
Neste trabalho uma nova equação cúbica de estado é proposta baseada no princípio de superposição temperatura-pressão. A equação trata de novas expressões para a determinação dos termos atrativo e co-volume sem dependência de propriedades críticas, podendo ser aplicada a qualquer forma cúbica. Neste estudo foi associada aos parâmetros da equa
Publicado em: 2011
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7. ANÁLISE ESTRUTURAL DE PÁS DE GERADOR EÓLICO DE PEQUENO PORTE FEITAS DE FIBRA VEGETAL BRASILEIRA / STRUCTURAL ANALYSIS OF BLADES SMALL WIND GENERATOR MADE OF BRAZILIAN VEGETABLE FIBER
The wind energy potential in the Northeast of Brazil, and especially in the state of Ceará is huge and offers conditions to compensate the missing options for building further full size hydroelectric Power plants and to guarantee the energy supply for this region with green renewable energy. Apart from that it offers opportunities for promoting a sustainabl
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/11/2010
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8. Evaluation of activated vegetal charcoal and vegetal polymer on the detoxification of the sugarcane hemicellulosic hydrolysate for biotechnological production of xylitol / Avaliação do carvão vegetal ativado e polímero vegetal na destoxificação do hidrolisado hemicelulósico de bagaço de cana-de-açúcar para a produção biotecnológica de xilitol
The increasing search for ethanol fuel in order to reduce the dependence and to promote the substitution of fossil fuels will contribute to higher accumulation of sugarcane bagasse in the environment. This biomass that in Brazil is a by-product of the sugar-alcohol mills, although it has been used for the generation of energy in the sugar and alcohol product
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2010
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9. Properties of SBS and sisal fiber composites: ecological material for shoe manufacturing
The worldwide trend toward using cheap, atoxic and durable materials from renewable resources contributes to sustainable development. Thus, the investigation of the potential use of vegetal fibers as reinforcing agent in polymeric composites has gained new significance. Sisal fiber has emerged as a reinforcing material for polymers used in automobile, footwe
Materials Research. Publicado em: 2008-12
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10. Caracterização por ressonância magnética nuclear da celulose bacteriana acetilada em solução de dimetilacetamida/cloreto de lítio
Cellulose consists of an insoluble polysaccharide, used in industrial scale for manufacture of paper, films, or in the dust form, natural, hydrolyzed or derivatized. Bacterial cellulose, mainly produced by the bacterium Acetobacter xylinum, is identical to the vegetal one, but free of lignin and hemicellulose, wuich eliminates severe chemical processes of pu
Publicado em: 2008
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11. Analysis of the fracture behavior of polypropylene: sawdust composites
Natural fiber reinforced composite is an emerging area in Polymer science. The use of lignocellulosic materials in thermoplastic composites may contribute to reduce the waste of vegetal biomass. The natural fibers are biodegradable, low cost materials having density and specific properties comparable to those of conventional fiber composites. In this work co
Polímeros. Publicado em: 2005-06
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12. Alternative castor oil-based polyurethane adhesive used in the production of plywood
Plywood is normally produced with urea-formaldehyde and/or phenol-formaldehyde adhesives. However, the former is considerably toxic and environmentally damaging, while the latter is expensive, thus motivating the search for alternative raw materials in plywood production. The castor oil-based polyurethane adhesive developed at the São Carlos Institute of Ch
Materials Research. Publicado em: 2004-09