Wood Chemical Properties
Mostrando 25-36 de 52 artigos, teses e dissertações.
-
25. Potencial da madeira Eucalyptus benthamii Maiden et Cambage visando à produção de celulose Kraft / Potential of Eucalyptus benthamii Maiden et Cambage wood for kraft pulp production
The purpose of this study was to evaluate the quality of Eucalyptus benthamii wood for kraft pulp production. Probably the most planted Eucalyptus clone in Brazil, a hybrid of Eucalyptus urophylla x Eucalyptus grandis, was also analyzed for comparison purposes. The wood characteristics analyzed were the basic density and chemical composition. Laboratory pulp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2010
-
26. Adsorption of mercury (II) from liquid solutions using modified activated carbons
Mercury is one of the most toxic metals present in the environment. Adsorption has been proposed among the technologies for mercury abatement. Activated carbons are universal adsorbents which have been found to be a very effective alternative for mercury removal from water. The effectiveness with which a contaminant is adsorbed by the solid surface depends,
Materials Research. Publicado em: 2010-06
-
27. Sodium lignosulphonate as agent of modification of lignocellulosic fiber surface and formulation of phenolic thermoset / Lignosulfonato de sódio como agente de modificação da superfície de fibras lignocelulósicas e da formulação de termorrígido fenólico
Due to the great current interest in biocomposites because of both the use of lignocellulosic fibers as reinforcers of polymer matrices and the production of matrices prepared from renewable raw material, this study has sought to improve the properties of phenolic thermosets using sodium lignosulphonate as a macromonomer, and the insertion of sisal fibers, e
Publicado em: 2010
-
28. Evaluation of the technological properties of the wood of Eucalyptus urophylla by near infrared spectroscopy. / AVALIAÃÃO DAS PROPRIEDADES DA MADEIRA DE Eucalyptus urophylla POR MEIO DA ESPECTROSCOPIA NO INFRAVERMELHO PRÃXIMO
Forestry companies such as pulp and paper, steel and timber producers, require fast and accurate methods to be applied in a large number of samples for characterization of their raw material. The Near InfraRed Spectroscopy-NIRS is a technique considered fast, non-destructive, applicable in products whose molecules contain mainly CH, OH, NH, HS or C=O bonds.
Publicado em: 2008
-
29. Effect of age of the wood of eucalyptus in its chemical and pulpability, and bleachability and properties of the pulp / Efeito da idade da madeira de eucalipto na sua química e polpabilidade, e branqueabilidade e propriedades físicas da polpa
The concern about the quality of the wood that enters a cellulose factory has been focused on many studies, once the productive process and final product are under great influence of the original raw material. Considering the demand for younger trees, the effect of the age of the wood in the chemical constitution and the variables of the process, as well as
Publicado em: 2008
-
30. Characterization of wood known in the Brazilian Amazon as mata-mata (Lecythidaceae fam. A. Rich.). / CaracterizaÃÃo das madeiras conhecidas na AmazÃnia Brasileira como MatÃ-matà (Lecythidaceae fam. A. Rich).
In spite of the great diversity of species of the Amazon forest, only a limited number of species is commercially exploited for wood production. This fact shows that the use of forest areas is only partial, with technical, economical and environmental disadvantageous consequences. A possible way to reduce this situation is the insertion of new species in the
Publicado em: 2008
-
31. Influência dos teores de lignina, holocelulose e extrativos na densidade básica e na contração da madeira e no rendimento e densidade do carvão vegetal de cinco espécies lenhosas do cerrado
The objective of this study was to evaluate the influence of the chemical properties (content of lignin, holocellulose and extratives) of five species of woody cerrado (Pterodon pubescens, Dalbergia miscolobium, Sclerolobium paniculatum, Stryphnodendron adstringens and Vochysia thyrsoidea) on the density and shrinkage the wood in income and apparent density
Publicado em: 2008
-
32. Boards produced with Wood of eucalyptus: Case study of species and provenances / PainÃis de madeira de Eucalipto: Estudo de caso de espÃcies e precedÃncias
This work aimed at the evaluation of fifteen provenances coming from species of Eucalyptus cloeziana, Eucalyptus grandis and Eucalyptus saligna; in the manufacture of plywoods and particle boards. The basic density and chemical composition of the trees were measured initially. Six boards per modality of plate for each provenance were manufactured. In the ven
Publicado em: 2008
-
33. Caracterização fisico-química de adobe estabilizado com amido de mandioca
Due to the high habitational Brazilian shortage, traditional technologies of earth construction and constructive elements production have been rescue, having the soil as a principal raw material. Between these traditional technologies, there are the adobes, which consist of soil blocks with regional variable size. The soil material is removed, humidified, tr
Publicado em: 2008
-
34. The Study of wood particules and recycled LDPE composites in the presence of coupling agents / Estudo de compósitos de partículas de madeira e PEBD reciclado na presença de agentes compatibilizantes
The objective of this work was to employ the recycled low density polyethylene as polymeric matrix with wood particles (PM) of eucalypt to obtain composites, in presence of lignin, from residue paper industry, as coupling agent. Besider lignin, PE-g-MA (functionalized polyethylene with maleic anhydride) was also used as coupling agent in order compare the ef
Publicado em: 2006
-
35. Utilização de adesivos à base de taninos de Acácia Negra e Eucalyptus pellita para fabricação de painéis OSB. / Utilization of tannin from acacia and Eucalyptus pellita as resin for OSB production.
The purpose of the present work was to study the viability of the utilization of the tannins of the bark from Acacia mearnsii and of Eucalyptus pellita wood, as adhesive (Tannin- Formaldehyde) for the OSB production. Seven condition of extraction (water at 100C, water / 1% urea, water/2% urea, water/5% urea, water/1% sodium sulphite, water/ 2% sodium sulphit
Publicado em: 2006
-
36. Chemical and antimicrobial activity of stem Kielmeyera cuspidata. / Estudo químico e da atividade antimicrobiana do caule da Kielmeyera cuspidata.
The present work describes the phytochemical investigation Kielmeyera cuspidata that belongs to the family Clusiaceae. This species was studied chemically for the first time. Many species of Clusiaceae family are known to possess mainly xanthones that exhibit some important bioactivities. The hexane and methanolic extract were obtained by percolation of the
Publicado em: 2006