Mestrado em Ciências Florestais
URI Permanente para esta coleção
Nível: Mestrado Acadêmico
Ano de início: 2008
Conceito atual na CAPES: 4
Ato normativo: Ofício N. 39-12/2007/CTC/CCA/CAPES de 31/07/2007 Homologado pelo CNE (Portaria Nº 656 de 22/05/2017) Publicação DOU em 27/07/2017, Seç. 1, Pag. 36.
Periodicidade de seleção: Semestral
Área(s) de concentração: Ciências Florestais
Url do curso: https://cienciasflorestais.ufes.br/pt-br/pos-graduacao/PPGCFL/detalhes-do-curso?id=1424
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Navegando Mestrado em Ciências Florestais por Assunto "Adhesive"
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- ItemCaracterização de painéis aglomerados produzidos com madeira de eucalipto e resíduos lignocelulósicos agroindustriais(Universidade Federal do Espírito Santo, 2016-11-16) Martins, Rhagnya Sharon Ferreira; Vidaurre, Graziela Baptista; Gonçalves, Fabricio Gomes; Lelis, Roberto Carlos Costa; Segundinho, Pedro Gutemberg de AlcântaraThe present work had as objective to characterize particleboard made from eucalyptus wood in combination with waste from agricultural activity (carpel of macadamia nut, parchment coffee and papaya stalk), using as urea formaldehyde adhesives and binders tannin urea formaldehyde. Analysed the physical properties density, water absorption and swelling in thickness; the mechanical properties static bending strength, tensile perpendicular (internal link) and Janka hardness; and the emission of formaldehyde. The particleboards have been classified as mediumdensity. Despite the increase in the percentage of residues on composition of particleboard and replacing 10% of urea formaldehyde resin by tannic extract have promoted the reduction of the physical properties, the particleboard attended performance specifications for water absorption and swelling in thickness. The average values of mechanical properties perpendicular traction (internal link), and Janka hardness obtained for the studied wastes generally met quality standards, with the exception of bending property. The addition of 10% urea formaldehyde resin tannic extract reduced 22.5% the emission of free formaldehyde in the particleboard. The results indicate the potential for the use of lignocellulosic waste papaya stalk, carpel of macadamia nut and parchment coffee as a raw material for the manufacture of particleboard, which are not recommended when subjected to bending stresses.
- ItemCaracterização tecnológica das madeiras de duas espécies de mogno africano (Khaya ivorensis A. Chev. E Khaya senegalensis (Desr.) A. Juss.)(Universidade Federal do Espírito Santo, 2014-02-20) França, Tâmara Suely Filgueira Amorim; Paes, Juarez Benigno; Vidaurre, Graziela Baptista; Arantes, Marina Donária Chaves; Oliveira, José Tarcísio da Silva; Baraúna, Edy Eime PereiraThe objective of this study was to determine the technological properties of the wood of Khaya ivorensis and Khaya senegasensis (African mahogany) in trees with 19 years old, from the Vale Nature Reserve, Espírito Santo. The characterization of African mahogany woods was by anatomic description, determination of physical and mechanical properties, analysis of extractives, evaluation of natural resistance of, wood decay organisms (white rot fungi, brown and soft and dry wood termites and subterranean termite) under laboratory conditions, studying the behavior of the accession of wood. On the anatomical description, there were differences between species. The timber of Khaya ivorensis was classified as a low density wood, and the wood of Khaya senegalensis was classified as medium density wood. Both species with medium dimensional stability. The timber of Khaya senegalensis was mechanically more resistant in all the tests. The wood of Khaya ivorensis was more resistance to attack by white rot fungi and wood of Khaya senegalensis was more resistant to fungal attack of brown and soft rot and dry wood termites and subterranean termite. Both species of African mahogany not obtained satisfactory results in the tests for accession.
- ItemDesenvolvimento de calços de madeira laminada colada a partir de resíduos de eucalipto(Universidade Federal do Espírito Santo, 2019-02-27) Lopes, Nayara Franzini; Gonçalves, Fabricio Gomes; Pedro Gutemberg de Alcântara Segundinho; Alves, Rejane Costa; Oliveira, José Tarcísio de SilvaTimber dunnage are used as separators between steel plate and metal profiles in the stowage and storage and are currently made up of pieces of solid sawn timber. However, the reduction of the offer of native species wood to and the inability of the reforestation species to provide pieces of wood with good quality to the market led to the use of alternative techniques for better use of wood. Then there is the technique of glued laminated timber (Glulam) which is the gluing of woods from the association of pieces that are selected and arranged with the fibers parallel to each other for gluing using adhesives and pressing, that can to substitute the solid wood. It is known that this technique has a relevant appeal in terms of the potential of use already established in wood structures. So, this work aimed to develop a type of dunnage with the use of the technology of gluing eucalyptus wood waste from sawmills capable of ensure the safe storage and stowage of steel plates and metal profiles. For this, we made a characterization of the physical properties of the wood, determining the apparent density, the moisture content and the shrinkability. The mechanical tests were performed aiming to evaluate the resistance to normal compression to the fibers, the resistance to parallel compression, the shear strength in wood and in the glue line in two conditions of humidity (dry and saturated), besides the delamination test. Non- destructive tests of free transverse vibration, longitudinal vibration and stress wave in the dunnage were performed. Eucalyptus urophylla x grandis wood has good physical properties, which allows its use for making Glulam elements. Results showed a high resistance of the adhesives in the dry condition, not being found the same performance when tested in the saturated condition. Dunnage made of waste presented satisfactory results when compared to the Glulam dunnage made with an entire lamina, being a good substitute for the existing ones.