Effect of artificial weathering on the properties of heat treated wood

Yıldız, Sibel; Tomak, Eylem Dizman; Yıldız, Ümit Cafer; Ustaömer, Derya

doi:10.1016/j.polymdegradstab.2013.05.004

Cited by 92 publications

(86 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…From that point on, the entire specimens' ΔE values remained relatively constant up to 3000 h. This result indicates the better color stability of heat-treated Larix spp. exposed to UV radiation and moisture spray, which is in accordance with previous research (Yildiz et al 2013).…”

Section: Color Changes In the Wood Specimenssupporting

confidence: 93%

“…2a, the untreated sample has intact cell walls and some easy-to-recognize damage caused by splitting; however, the heat treatment had only a slight effect on the cell wall structure (Figs. 2b-d); a previous heat treatment study yielded similar results (Yildiz et al 2013), with cracks between the S1 and S2 layers, visible changes in the pits, and abrupt transitions between earlywood and latewood. The untreated wood surfaces became brittle and rough after 3000 h of artificial weathering (including UV treatment and moisture spray).…”

Section: Microstructure Analysis Using Semsupporting

confidence: 72%

See 1 more Smart Citation

Effect of Artificial Weathering on the Properties of Industrial-Scale Thermally Modified Wood

Dong¹,

Wang²,

Li³

2015

BioResources

View full text Add to dashboard Cite

Thermally modified wood is widely used in cladding, decking, and other construction projects that are meant for outdoor exposure. The purpose of this study was to investigate changes in the color, microstructure, and chemical composition of heat-treated, Larix spp. wood that was exposed to artificial weathering. In this study, accelerated weathering tests (UV and moisture) were conducted over a period of 3000 h. Photodegradation of both heat-treated and untreated wood was evaluated in terms of color, microstructure, and chemical changes that were characterized using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Ultra-violet radiation caused the degradation of lignin and extractives of wood, resulting in an immediate color change of the wood. The SEM observation of the heat-treated wood showed deformations and cracks in both treated and untreated samples. Irradiation resulted in a pronounced reduction in the absorption intensity and broadening of the FTIR spectra. It was found that the industrial heattreatment of wood products resulted in more color stability than untreated wood during the early stages of weathering. Thermal modification was found, however, was ineffective in improving the UV resistance wood over long-term photodegradation conditions.

show abstract

Section: Color Changes In the Wood Specimenssupporting

confidence: 93%

Section: Microstructure Analysis Using Semsupporting

confidence: 72%

Effect of Artificial Weathering on the Properties of Industrial-Scale Thermally Modified Wood

Dong¹,

Wang²,

Li³

2015

BioResources

View full text Add to dashboard Cite

show abstract

“…Tomak et al (2014) and Yildiz et al (2013) observed that natural or accelerated weathering led to a reduction in compression strength, modulus of rupture (MOR), and modulus of elasticity (MOE) in thermally modified wood. Although the color stability and photostability of thermally modified wood has improved (Ayadi et al 2003;Nuopponen et al 2004;Dubey et al 2010;Huang et al 2012a;Huang et al 2013), the color of most thermally modified wood is lightened during UV exposure or solar irradiation (Srinivas and Pandey 2012;Huang et al 2012b;Tomak et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Although the color stability and photostability of thermally modified wood has improved (Ayadi et al 2003;Nuopponen et al 2004;Dubey et al 2010;Huang et al 2012a;Huang et al 2013), the color of most thermally modified wood is lightened during UV exposure or solar irradiation (Srinivas and Pandey 2012;Huang et al 2012b;Tomak et al 2014). Yildiz et al (2013) investigated the color change during artificial weathering of four heat-treated wood species (ash, iroko, Scots pine, and spruce) at 200 °C and suggested that the protective effect of heat-treatment was lost during longer weathering exposures. The color of thermally modified wood has shown little difference compared with untreated wood after a long exposure (Huang et al 2012a,b;Yildiz et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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

Shen¹,

Cao²,

Sun³

et al. 2016

BioResources

View full text Add to dashboard Cite

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.

show abstract

“…The degradation of the hemicelluloses starts to take place at a relatively low temperature (between 160 and 260 ºC). Also, the degradation of the hemicelluloses increases with heat treatment temperature and treatment time (Poncsák et al 2006, Yildiz et al 2011. The softwoods are more thermally stable than hardwoods, which is the result of their hemicellulose content and compositional differences (Fengel and Wegener, 1989).…”

Section: Radial* Radijalnimentioning

confidence: 99%