Modification of mass transfer properties in poplar wood ( P. robusta ) by a thermal treatment at high temperature

Rousset, Patrick; Perré, Patrick; Girard, Philippe

doi:10.1007/s00107-003-0459-5

Cited by 52 publications

(51 citation statements)

References 14 publications

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“…However, they explained the increase by some changes in the extractive distribution profile. In contrast to the present and Choonge et al's studies, Rousset et al (2004) observed that the thermal treatment of poplar (Populus robusta) at 200°C reduces the value of mass diffusivity. These contradictory observations can be explained by the fact that the complicated effect of steaming on the wood diffusion coefficient depends on the wood species (i.e., the wood porous structure) and heat treatment condition.…”

Section: Effect Of Pre-steaming On the Diffusion Coefficientcontrasting

confidence: 99%

“…Choonge et al (1999) reported that prolonged steaming increased the moisture diffusivities of southern pine above and below the FSP, partially due to changes in the extractive distribution profile. Rousset et al (2004) stated that the thermal treatment of poplar (Populus robusta) at 200°C reduces the value of mass diffusivity, probably due to the chemical modification of the cell wall. However, the permeability value does not change significantly, probably because the thermal treatment has a slight impact on the porous structure of wood.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Pre-Steaming on Mass Transfer Properties of Fir Wood (Abies Alba L.); A Gymnosperm Species With Torus Margo Pit Membrane

Dashti¹,

Tarmian²,

Faezipour³

et al. 2012

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In this research, the effect of pre-steaming on mass transfer properties, including air permeability and water vapor diffusivity of fir wood (Abies alba L.), a gymnosperm species with torus margo pit membrane, was evaluated. The pre-steaming was performed at temperatures of 120, 140, and 160°C for 1 hour under a pressure of 2-3 bars. Then, the presteamed specimens were conventionally dried at a constant temperature of 160°C and a relative humidity of 50% to the final moisture content of 10%. Subsequently, the mass transfer properties of the dried specimens were measured in longitudinal and radial directions. Overall, the presteaming was found to be an effective modification method to improve the mass transfer properties of Abies alba L. The improvement was more remarkable for the air permeability as well as through the radial direction. The specimens steamed at the temperature of 160°C had higher mass transfer rates than those steamed at the temperatures of 120 and 140°C. Results of chemical analyses, FT-IR spectroscopy, and SEM imaging provide some explanations for the effects of pre-steaming.

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Section: Effect Of Pre-steaming On the Diffusion Coefficientcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Steaming on Mass Transfer Properties of Fir Wood (Abies Alba L.); A Gymnosperm Species With Torus Margo Pit Membrane

Dashti¹,

Tarmian²,

Faezipour³

et al. 2012

BioResources

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show abstract

“…Poplar wood was thermal-treated to improve its dimensional stability and resistance against fungi and insects, and the degradation of some hydrophilic components reduced significantly the ability of bound water to migrate through the wood (Giebeler 1983;Rousset et al 2004). Nevertheless, the effect of heat treatment on the surface properties of plantation poplar timbers, especially wettability and surface brittleness, has rarely been studied.…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristics of Poplar Wood with High-Temperature Heat Treatment: Wettability and Surface Brittleness

et al. 2016

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The many uses of wood are greatly affected by its surface properties, which are significantly altered by heat treatment. Investigated here are the wettability and surface brittleness when treating poplar wood with heat at 160, 180, 200, and 220 °C for 2 h. Contact angles were measured by the sessile drop method, and surface free energy was calculated. Surface brittleness was expressed by hardness (HD value), roughness (Ra, Rq, Ry, and Rz values), and abrasive resistance (K value). Next, non-destructive Fourier transform near-infrared spectroscopic (FT-NIR) and X-ray photoelectron spectroscopic (XPS) measurements were employed to analyze the surface chemical changes. Scanning electron microscopy (SEM) revealed the post-heating microscopic structure. The results demonstrated that heat treatment reduces the surface wettability while increasing the surface brittleness, which becomes more apparent with increased temperature. Significant differences were determined (p < 0.05) between the surface parameters at four different temperatures. The degradation of cell wall components and the deterioration of microstructures was further expounded by FT-NIR, XPS, and SEM analyses. Furthermore, the abrasive resistance and hardness values decreased in line with the rate of weight loss (WL, %) and temperature. This indicates a strong correlation between the surface characteristics and the WL or temperature. The intensity of heat treatment appears to be predictable and easy to regulate.

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“…As análises estatísticas indicaram uma interação tripla (espaçamento × grupo × temperatura) para TUE-termo (Tabela 1; Figura 5). Rousset et al (2004) obtiveram resultados similares para a madeira de Populus robusta tratada a 200°C durante 1 hora, a qual apresentou reduções significativas entre 40 e 60%.…”

Section: Teor De Umidade Da Madeira Antes E Após a Termorretificaçãounclassified

“…Syrjänen (2001) afirma que a propriedade mais importante da madeira termorretificada é o menor teor de umidade de equilíbrio higroscópico, o que, consequentemente, reduz as variações dimensionais (contração e inchamento) do material, quando comparada à madeira não tratada. Weiland & Guyonnet (2003) e Rousset et al (2004) afirmam que a madeira termorretificada apresenta uma maior estabilidade dimensional devido à redução da higroscopicidade, causada pela degradação das hemiceluloses (constituinte mais higroscópico da parede celular), à ruptura dos grupos hidroxílicos livres da região amorfa da celulose e à reticulação dos polímeros que compõem a madeira.…”

Section: Introductionunclassified

Propriedades físicas da madeira de teca termorretificada

et al. 2014

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RESUMOO objetivo deste estudo foi determinar o efeito de tratamentos termorretificadores nas propriedades físicas (densidade e teor de umidade) da madeira de teca (Tectona grandis L. f.), proveniente de plantios de diferentes espaçamentos. Amostras de madeira de cerne e alburno foram termorretificadas a 180°C e 200°C durante 2 horas e 30 minutos. A termorretificação afetou mais a densidade do cerne do que a densidade do alburno. As madeiras de cerne e alburno apresentaram uma redução média de 52% no teor de umidade de equilíbrio, após a termorretificação. O espaçamento entre árvores também afetou as propriedades físicas da madeira após a termorretificação.Palavras-chave: densidade, teor de umidade, termorretificação, Tectona grandis. Physical Properties of Heat-treated Teak Wood ABSTRACTThe objective of this study was to determine the effect of heat treatments on the physical properties (density and moisture content) of teak (Tectona grandis L. f.) wood from plantations of different spacings. Heartwood and sapwood samples were heat treated at 180 °C and 200 °C for 2 hours and 30 minutes. Heat treatment produced greater effect on heartwood density compared with sapwood density. Heartwood and sapwood presented an average reduction of 52% in equilibrium moisture content after heat treatment. Tree spacing also affected the physical properties of wood after heat treatment.

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Modification of mass transfer properties in poplar wood ( P. robusta ) by a thermal treatment at high temperature

Cited by 52 publications

References 14 publications

Effect of Pre-Steaming on Mass Transfer Properties of Fir Wood (Abies Alba L.); A Gymnosperm Species With Torus Margo Pit Membrane

Effect of Pre-Steaming on Mass Transfer Properties of Fir Wood (Abies Alba L.); A Gymnosperm Species With Torus Margo Pit Membrane

Surface Characteristics of Poplar Wood with High-Temperature Heat Treatment: Wettability and Surface Brittleness

Propriedades físicas da madeira de teca termorretificada

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