Characterization of lignocellulosic curaua fibres

Spinacé, Márcia A. S.; Lambert, Carlos Salles; Fermoselli, Karen K.G.; Paoli, Marco-Aurélio De

doi:10.1016/j.carbpol.2008.12.005

Cited by 282 publications

(215 citation statements)

References 29 publications

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“…The thermal degradation of polysaccharides, like cellulose and hemicelluloses, may occur by cleavage of glycosidic, C-H, C-O and C-C bonds, dehydration, decarboxylation and decarbonylation reactions, with formation of C-C, C=C, C-O bonds as well as carbonyl and carboxyl groups (GARCÌA-PÉREZ et al, 2001;SPINACÉ et al, 2009). The weight loss of lignin occurs at higher temperatures and its degradation is associated to dehydration, yielding derivatives with lateral unsaturated chains and the release of water, CO 2 , CO and methane (SPINACÉ et al, 2009).…”

Section: Wood Thermal Propertiesmentioning

confidence: 99%

“…The weight loss of lignin occurs at higher temperatures and its degradation is associated to dehydration, yielding derivatives with lateral unsaturated chains and the release of water, CO 2 , CO and methane (SPINACÉ et al, 2009). However, wood thermal degradation is a complex process and involves several consecutive and/or competitive reactions.…”

Section: Wood Thermal Propertiesmentioning

confidence: 99%

“…According to Tsujiyama et al (2000) an exothermal peak related to hemicelluloses can be observed at around 340 °C, while a second exothermal peak assigned to lignin can be observed at 475 °C. According to Yang et al (2007) hemicelluloses presents an exothermal peak at 275 °C.…”

Section: Wood Thermal Propertiesmentioning

confidence: 99%

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Thermal Degradation and Morphological Aspects of Four Wood Species Used in Lumber Industry

Poletto

2016

Rev. Árvore

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-The aim of this work was characterize four wood waste samples from lumber industry in order to obtain previous information about structure and properties of wood before use it as a biofuel or as reinforcement in composite formulations. The influence of wood components on the thermal degradation stability of different wood species has been investigated using thermogravimetry, differential scanning calorimetry and scanning electron microscopy. Four wood species, Eucalyptus grandis (EUG), Pinus elliottii (PIE), Dipteryx odorata (DIP) and Mezilaurus itauba (ITA), were used in this study. The results showed that higher extractives contents may form a thin film on the wood fiber surface which can accelerate the degradation process and reduce the wood thermal stability Keywords: Wood thermal stability; Wood chemical composition; Wood waste. DEGRADAÇÃO TÉRMICA E ASPECTOS MORFOLÓGICOS DE QUATRO ESPÉCIES DE MADEIRA PROVENIENTES DA INDÚSTRIA MADEIREIRARESUMO -O objetivo deste trabalho foi caracterizar quatro amostras de resíduos de madeira oriundas da indústria madeireira a fim de obter informações prévias sobre a estrutura e as propriedades da madeira antes do seu uso como biocombustível ou como reforço em compósitos. A influência dos componentes da madeira na estabilidade térmica de diferentes espécies de madeira foi investigada utilizando termogravimetria, calorimetria exploratória diferencial e microscopia eletrônica de varredura. Quatro espécies de madeira, Eucalyptus grandis (EUG), Pinus elliottii (PIE), Dipteryx odorata (DIP) e Mezilaurus itauba (ITA), foram utilizadas neste estudo. Os resultados mostraram que elevadas quantidades de extrativos podem formar uma fina película na superfície da fibra de madeira, o que pode acelerar o processo de degradação e reduzir a estabilidade térmica da madeira.Palavras-chave: Estabilidade térmica da madeira; Composição química da madeira; Resíduos de madeira.

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Section: Wood Thermal Propertiesmentioning

confidence: 99%

Section: Wood Thermal Propertiesmentioning

confidence: 99%

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Thermal Degradation and Morphological Aspects of Four Wood Species Used in Lumber Industry

Poletto

2016

Rev. Árvore

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“…After testing several formulations [16] , we choose to prepare composites with 20 wt % of curaua fibers and 80 wt % of polypropylene. A range of PP-g-MA contents, from 0 to 4 pph (parts per hundred) calculated in relation to the total weight of the sample, was used.…”

Section: Preparation Of the Compositesmentioning

confidence: 99%

Mechanical properties, morphology and thermal degradation of a biocomposite of polypropylene and curaua fibers: coupling agent effect.

et al. 2013

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Biocomposites of polymers with vegetal fibers have a broad spectrum of applications due to their high specific properties in comparison to their counterparts made with fiberglass. Polypropylene, PP, composites with curaua fiber compatibilized with different concentrations of maleic anhydride grafted polypropylene, PP-g-MA, were characterized according to their mechanical properties, morphologies and thermal stabilities in oxidative and inert atmospheres. The composites were prepared by single screw extrusion and injection molded specimens were used for testing. The composite with 20 wt % of curaua fiber with and without compatibilizer presented improved mechanical properties compared to pure PP. The use of PP-g-MA as a compatibilizer significantly increased fiber/matrix adhesion, however, the mechanical properties were only slightly improved in comparison with composites without compatibilizer. We observed an improvement in thermal stability of the composites, compared to that expected from the weighted average of the individual components, both under inert and oxidative atmospheres. Furthermore, the thermal stability improved under inert atmosphere as a function of the concentration of compatibilizer. In this situation, indeed, there was a different shift of the weight loss processes owing to the presence of the compatibilizer.

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“…In the hypothesis that lots with greater number of fibers could be investigated, maybe even thicker and thinner fibers would be possibly be found, extending the range of the histograms in Another relevant point is that different lots of the same type of lignocellulosic fibers may display changes in diameter distribution. This has been found in piassava [34] and curaua [35] fibers. Consequently, a comparison of results based on diameter analysis of distinct lots of a given lignocellulosic fiber might disclose dissimilarities.…”

Section: Specific Distribution Of Diametermentioning

confidence: 56%

Selection of high strength natural fibers

Monteiro¹,

Satyanarayana

Ferreira³

et al. 2010

Matéria (Rio J.)

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By means of dimensional selection of natural lignocellulosic fibers, based on precise diameter measurements, it was recently possible to obtain fibers with relatively higher tensile strength. The present article overviews works on the statistical evaluation, through the Weibull analysis, of the ultimate tensile stress of eight lignocellulosic fibers: sisal, ramie, curaua, jute, bamboo, coir, piassava and buriti. It is shown that, for all of these fibers, the tensile strength holds an inverse relationship with the fiber diameter. Statistically this relationship conforms to a hyperbolic type of analytical equation, which discloses the possibility of unusually high strength fibers to be selected in association with very small diameters. A structural analysis using scanning electron microscopy offered an explanation to the strengthening mechanisms responsible for the superior performance of these dimensionally selected fibers.

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Characterization of lignocellulosic curaua fibres

Cited by 282 publications

References 29 publications

Thermal Degradation and Morphological Aspects of Four Wood Species Used in Lumber Industry

Thermal Degradation and Morphological Aspects of Four Wood Species Used in Lumber Industry

Mechanical properties, morphology and thermal degradation of a biocomposite of polypropylene and curaua fibers: coupling agent effect.

Selection of high strength natural fibers

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