Changes in chemistry, color, dimensional stability and fungal resistance of Pinus radiata D. Don wood with oil heat-treatment

Dubey, Manoj Kumar; Pang, Shusheng; Walker, J. C. F.

doi:10.1515/hf.2011.117

Cited by 104 publications

(111 citation statements)

References 48 publications

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“…Heat-treated wood possesses novel properties, such as improved decay resistance, higher dimensional stability, aesthetic coloration, and photo-degradation (Dubey et al 2012;Persze and Tolvaj 2012;Bal and Bektaş 2013;Bekhta et al 2014;Aytin and Korkut 2015). However, adverse influences on mechanical characteristics, like impact strength, compression strength, and shear strength, restrict the heat-treated wood from being used in structural applications (Kasemsiri et al 2012;Bakar et al 2013).…”

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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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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“…Important changes occurred at 2928, 2857, 1738, and 1373 cm -1 , and the region 1300 to 1193 cm -1 , which are indicative of the grafting of new functional groups to the wood (Chang and Chang 2001;Pandey and Vuorinen 2008;Pandey et al 2010;Dubey et al 2012). All the absorption bands increased significantly after modification with ELO.…”

Section: Ftir Spectroscopymentioning

confidence: 93%

Novel hydrophobization of wood by epoxidized linseed oil. Part 2. Characterization by FTIR spectroscopy and SEM, and determination of mechanical properties and field test performance

et al. 2014

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Scots pine samples were impregnated with epoxidized linseed oil (ELO) by means of a two-step process, and the effect of treatments has been studied concerning the Fourier transform infrared (FTIR) spectra, mechanical properties, moisture uptake, and field test performance. FTIR analysis of ELO-treated samples revealed that part of the ELO epoxy reactive group was chemically bound to the hydroxyl groups of wood. ELO-treated samples have improved dimensional stability, while the mechanical properties were slightly reduced and the moisture uptake was significantly lowered. The field performance of lap joints treated with ELO (90 kg m -3 ) after 60 months' exposure showed great improvements in performance, as the average annual moisture content (MC) was maintained at the level of 19.3% compared to 34.6% for lap joints treated with linseed oil (LO). The lap-joint area was not stained, and less discoloration by staining fungi on the external surfaces was observed in ELO-treated samples compared to samples treated with LO.

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“…The decrease in hemicellulose-a highly hydrophilic polymer-reduces the free hydroxyl groups. Because the transformation of carbohydrates blocks fungi growth and reproduction (Dubey et al 2012), heat-modified wood has better dimensional stability and decay resistance.…”

Section: Chemical Changes In Main Wood Componentsmentioning

confidence: 99%

“…2). Boonstra and Tjeerdsma (2006), Kocaefe et al (2008), and Dubey et al (2012) found that the absorption intensity at 1740 cm -1 decreased during the heat treatment, demonstrating that hemicellulose is not stable and is easily degraded by a high temperature treatment. In contrast, this study revealed that the peak areas at 1732 cm -1 increased with rising temperature, especially at 220 °C, and did not decrease (Fig.…”

Section: Ftir Analysis Of the Whole Wood Of Each Specimenmentioning

confidence: 99%

“…Navickas and Albrektas (2013) studied dimensional changes in oak and found that specimens exposed to 220 °C obtained the least amount of moisture in both a humid atmosphere and water; this result indicated that dimensional stability was improved significantly through heating. Dubey et al (2012) reported that treated wood became darker and the dimensional stability and fungal resistance were better by the immersion treatment in heating oil. Durability of heat-treated wood exposed for 12 weeks laboratory soil block was improved (Kamden et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Chemical Analysis of Densification, Drying, and Heat Treatment of Scots pine (Pinus sylvestris L.) through a Hot-Pressing Process

Li¹,

Wang²,

Wu³

2016

BioResources

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This study investigated a new potential hot-pressing method for wood modification, in which densification, drying, and heat-treatment were carried out in sequence. The effects of heat treatment on the chemical components of wood were evaluated. The specimens were treated at different temperatures (180 to 220 °C) for 2 to 5 h. Holocellulose, α-cellulose, and lignin were extracted from the treated and untreated milled wood. The changes in these components were analyzed by thermogravimetry (TG) and Fourier-transform infrared spectroscopy (FTIR). Due to its amorphous structure, most hemicelluloses were degraded when it was exposed to 220 °C for 3 h and to 200 °C for 5 h. Conversely, the lignin contents increased continuously throughout the treatment due to the loss of polysaccharides and the formation of cross-links. Because of the crystallinity, α-cellulose degradation was slight. According to the analysis of functional groups, FTIR showed treated wood was more hydrophobic than the untreated one.

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Changes in chemistry, color, dimensional stability and fungal resistance of Pinus radiata D. Don wood with oil heat-treatment

Cited by 104 publications

References 48 publications

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

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

Novel hydrophobization of wood by epoxidized linseed oil. Part 2. Characterization by FTIR spectroscopy and SEM, and determination of mechanical properties and field test performance

Chemical Analysis of Densification, Drying, and Heat Treatment of Scots pine (Pinus sylvestris L.) through a Hot-Pressing Process

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