Influência dos tratamentos de termorretificação e furfurilação em propriedades tecnológicas de uma conífera

Gallio, Ezequiel; Zanatta, Paula; Cruz, Nidria Dias; Zanol, Gustavo Spiering; Schulz, Henrique Römer; Gatto, Darci Alberto

doi:10.1590/s1517-707620190003.0739

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…In general, the reduction in the MOR property indicates that the thermal process generates a more pronounced decrease in hemicellulose content, since the reduction of this polymer is one of the main causes for the loss of strength (Gallio et al, 2019). Other authors (Poubel et al, 2015;Paneque et al, 2016;Modes et al, 2017;Mbamu et al, 2020) also state this behavior, explaining that the decrease in mechanical strength is related to the mass loss resulting from the applied heat treatment.…”

Section: Resultsmentioning

confidence: 90%

“…The vast use of wood is due to the advantages of the material for application in works, among these, in civil construction, since it is a natural polymer that has structural function and also organoleptic and technological characteristics that vary according to the exposure environment (Paula et al, 2016). One of the biggest challenges in the field of wood technology has been finding resources to make it possible to control dimensional change and product durability (Gallio et al, 2019). Therefore, the evaluation of the wood's properties becomes of utmost importance for the proper use and quality in the final piece.…”

Section: Introductionmentioning

confidence: 99%

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Effect of thermal modification on the technological properties of wood from species in an agroforestry system

Bandera

Eloy

Trevisan

et al. 2021

Agraria

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This work aims to evaluate the effect of thermal modification on the physical and mechanical properties of species of wood, from an agroforestry system. The species evaluated were Parapiptadenia rigida (Benth.) Brenan, Peltophorum dubium (Spreng.) Taub., Eucalyptus grandis × Eucalyptus urophylla and Schizolobium parahyba (Vell.) Blake, aged nine. The specimens were submitted to thermal treatments (120, 150, 180 and 210 °C), in addition to the control samples. For the mechanical properties, the modules of elasticity and rupture, tension in the proportional limit and maximum force were evaluated according to ASTM D 143-94. For the physical properties of basic density and shrinkage, the evaluation took place according to NBR 7190. The thermal treatment modified the mechanical properties of the wood in a positive way up to 180 ºC, with the highest values being observed for E. grandis × E. urophylla and P. rigida. Likewise, the heat treatment has modified the physical properties of wood retractability in a positive way up to 210 ºC, with the anisotropic coefficient decreasing with increasing temperature. Thus, it is concluded that the thermal modification alters the physical and mechanical properties of the four analyzed species. Furthermore, it is perceived that for the case of mechanical characteristics these changes are positive up to a temperature of 180 ºC, while for the physical ones the best results are found at a temperature of 210 ºC.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effect of thermal modification on the technological properties of wood from species in an agroforestry system

Bandera

Eloy

Trevisan

et al. 2021

Agraria

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“…Adjusted for a D65 source light and an angle of observation of 2 °. This equipment reported brightness (L*), green-red coordinate (a*), blue-yellow coordinate (b*), chroma (C*) and hue angle (h), which are used to calculate the total colour variation (E), as described in previous studies (Romagnoli et al, 2013;Gallio et al, 2019). Some wood properties (WPL, density, hardness, and colorimetric properties) were subjected to analyses of variance and whenever the null hypothesis was rejected, the averages were compared using Fisher tests at 5 % of significance.…”

Section: Characterization Testsmentioning

confidence: 99%

Chemical, Mechanical, Thermal, and Colorimetric Features of the Thermally Treated Eucalyptus grandis Wood Planted in Brazil

Schulz¹,

Acosta²,

Barbosa³

et al. 2021

Journal of the Korean Wood Science and Technology

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This article aimed at thermally treating and charactering the Eucalyptus grandis wood under three different temperatures. For this, pristine eucalypt samples were treated by heating in a laboratory oven at 160 °C, 200 °C and 240 °C, always for 2 h. Treatment parameters (based on weight percentage loss and specific gravity), as well as mechanical (by hardness tests), chemical (by infrared spectroscopy), thermal (by thermogravimetry), and colorimetric (by CIELab method) features were evaluated. Compared to the pristine ones, the treated woods have there was a drop in apparent density at 12 % and consecutively greater thermal stability which is probably related to a previous partial degradation of some major amorphous components (namely cellulose, hemicellulose and lignin), as suggested by the treatment parameters and infrared spectra. Besides of that, the higher the temperature treatment, the higher the loss in surface hardness and the higher the colour darkening.

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“…A termorretificação da madeira é um método utilizado com o objetivo de incrementar as propriedades físicas, químicas e mecânicas da madeira, expondo amostras ao calor, em temperaturas não maiores que 260 ºC. Estudos comprovam que a termorretificação acarreta alterações nas propriedades da madeira, por exemplo: melhorias na estabilidade dimensional (inchamento e retratibilidade), redução da higroscopicidade, modificações na resistência mecânica e alteração da coloração (escurecimento); [18,29,17].…”

Section: Introductionunclassified

Identificação anatômica e avaliação da melhoria na estabilidade dimensional em espécies amazônicas termorretificadas

et al. 2022

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RESUMO A Termorretificação é um método que se utiliza visando incrementar as propriedades físicas, químicas e mecânicas da madeira, expondo amostras a temperaturas elevadas. No presente estudo, avaliaram-se as melhorias e implicações proporcionadas pela termorretificação nas espécies amazônicas Angelim Vermelho, Cedro, Quaruba e Muiracatiara, quanto às alterações nas propriedades físicas, alterações na coloração, possíveis trincas, além disso, foi realizada a identificação anatômica destas espécies. A termorretificação foi realizada a temperaturas de 130, 150 e 170 °C. As maiores alterações na coloração foram evidenciadas nas espécies Angelim Vermelho e Muiracatiara. O aparecimento de trincas foi observado, principalmente, a 170 °C. A perda de massa foi diretamente proporcional ao emprego de maiores temperaturas. Alterações na densidade da madeira foram verificadas após o processo de termorretificação, com destaque para o Angelim Vermelho, seguindo um padrão linear com redução da densidade de acordo com o aumento das temperaturas aplicadas. Os ensaios da variação volumétrica revelaram uma redução da higroscopicidade das espécies tratadas em relação às testemunhas, exceto para o tratamento do Angelim Vermelho a 130 ºC. A análise anatômica possibilitou a identificação até nível de espécie, sendo as espécies estudadas: Dinizia excelsa Ducke, Cedrela fissilis Vell, Astronium ulei Mattick e Vochysia maxima Ducke, para Angelim Vermelho, Cedro, Muiracatiara e Quaruba.

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Influência dos tratamentos de termorretificação e furfurilação em propriedades tecnológicas de uma conífera

Cited by 7 publications

References 24 publications

Effect of thermal modification on the technological properties of wood from species in an agroforestry system

Effect of thermal modification on the technological properties of wood from species in an agroforestry system

Chemical, Mechanical, Thermal, and Colorimetric Features of the Thermally Treated Eucalyptus grandis Wood Planted in Brazil

Identificação anatômica e avaliação da melhoria na estabilidade dimensional em espécies amazônicas termorretificadas

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