Evolution of wood surface free energy after heat treatment

Gérardin, Philippe; Petrič, Marko; Pétrissans, Mathieu; Lambert, Jacques; Ehrhrardt, Jean Jacques

doi:10.1016/j.polymdegradstab.2007.01.016

Cited by 169 publications

(110 citation statements)

References 22 publications

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“…Kúdela (2014) stated that the surface free energy of beech wood, determined based on the study of the contact angles of wood wetted with water and α-bromonaphthalene, was 84.7 mJ·m -2 . Gérardin et al (2007) stated that the total surface free energy (calculated based on the examination of the contact angle of wood with three reference liquids i.e. water, diiodomethane, formamide) obtained for untreated pine sapwood and beech was relatively close.…”

Section: Materijali I Metodementioning

confidence: 99%

“…Studies carried out so far (Zhang et al, 1997;Kúdela, 2014;Rolleri et al, 2016) show that the wettability of wood shows a signifi cant differentiation depending on the chemical composition, roughness, polarity of the wetting liquid, processing method and air parameters. Wood wettability is also signifi cantly affected by thermal treatment (Gérardin et al, 2007;Kocaefe et al, 2008) or fungicide protection, among others (Fuczek et al, 2010).…”

Section: Introduction 1 Uvodmentioning

confidence: 99%

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Surface Wettability of Wood Species from Tropical and Temperate Zones by Polar and Dispersive Liquids

Laskowska

Kozakiewicz

2017

Drvna ind.

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Section: Materijali I Metodementioning

confidence: 99%

Section: Introduction 1 Uvodmentioning

confidence: 99%

Surface Wettability of Wood Species from Tropical and Temperate Zones by Polar and Dispersive Liquids

Laskowska

Kozakiewicz

2017

Drvna ind.

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“…Figure 2 shows changes in the FTIR spectra from 2000 to 1000 cm -1 of Scots pine sapwood after thermal modification and extraction. Comparing unmodified wood (U1-s and U2-s) with thermally modified samples (T1-s and T2-s), the relative intensity of the band at 1740 cm -1 , assigned to carbonyl groups and C=O stretching vibration of acetyl or carboxylic acid of hemicelluloses (Gérardin et al 2007;Esteves et al 2008), decreased after thermal modification, demonstrating the degradation of hemicelluloses. The degradation of hemicelluloses can decrease water adsorption, which was confirmed by the decreased relative intensity of the band at 1650 cm -1 after thermal modification.…”

Section: Weight Lossmentioning

confidence: 99%

Influence of Post-extraction on Photostability of Thermally Modified Scots Pine Wood during Artificial Weathering

Shen¹,

Cao²,

Sun³

et al. 2016

BioResources

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The photo-stabilizing effect of post-extraction was evaluated for thermally modified wood. Extracted and non-extracted thermally modified Scots pine (Pinus sylvestris L.) samples were exposed in a xenon weather-ometer for 1008 h, and the surface color and chemical changes were characterized using a chroma meter, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). The results showed that: (1) the weight losses of thermally modified wood were higher than those of unmodified wood after extraction due to the leaching of some low molecular weight compounds that were generated during thermal modification; (2) the photodegradation of thermally modified wood during weathering was hindered by the presence of extractives; and (3) the color change during weathering was a little more severe in sapwood than in heartwood because more extractives were present in heartwood.

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“…The slight decrease in the surface energy of heat-treated wood was attributed to the loss of free reactive hydroxyl groups present in hemicelluloses, which are strongly involved in wood wetting phenomena (Mitsui et al 2008;Kamperidou et al 2013). Gérardin et al (2007) investigated the surface energy of beech (Fagus sylvatica L.) heartwood and pine (Pinus sylvestris L.) sapwood using the Lifshitz-van der Waals acidbase approach. The results showed that the electron-accepting component was less affected by thermal treatment, and that the decrease in the electron-donating component appeared to be closely related to the degradation of the hemicelluloses and the decrease of the O/C ratio.…”

Section: Effects Of Temperature On Contact Angle and Surface Energymentioning

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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Evolution of wood surface free energy after heat treatment

Cited by 169 publications

References 22 publications

Surface Wettability of Wood Species from Tropical and Temperate Zones by Polar and Dispersive Liquids

Surface Wettability of Wood Species from Tropical and Temperate Zones by Polar and Dispersive Liquids

Influence of Post-extraction on Photostability of Thermally Modified Scots Pine Wood during Artificial Weathering

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

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